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Iterative super-exponential-estimator for fast blind channel identification of mobile radio fading channels | An iterative algorithm for blind channel identification (no training symbols necessary) based on the super-exponential-algorithm is shown. On the assumption of independent, identically distributed (i.i.d.) data the algorithm has fast convergence properties. It is robust with respect to system overfit (supernumerarily assumed channel coefficients converge to zero) and influence of modest additive white Gaussian noise even in mixed-phase moving average channels. Despite of the use of fourth order cumulants the complexity of the algorithm is rather low compared with alternative blind methods. Also the combination with an outer channel (de-)coder and MAP equalizer is possible to improve the performance. | The 1f-electron band of C60 mole.cule has been obtained by the tight binding approximation. Application of molecular or bital wave functions derived on the basis of the optimized bond orbital model gives, with simpler calculations, the results in sat isfactory agreement with those of previous theoretical analyses. | eng_Latn | 5,500 |
Analysis of rate optimized throughput for ARQ in fading interference channels | We consider the throughput performance of ARQ in interfering channels, where the signal of interest as well as the interferers are subject to independent distributed Nakagami-m block fading. The key contribution is the derivation of closedform expressions for the rate-maximized throughput. For this purpose, we employ the powerful parameterization approach from [1], allowing the problem to be solved exactly in a closedform. We also consider the scaled-power, and the interferencelimited, case. | This chapter is devoted to problems of the control of an observation process under various assumptions concerning the measurement matrix and the intensity of noise. A general procedure for constructing optimal observation laws is given. Specific procedures are obtained and investigated for particular cases. | eng_Latn | 5,501 |
Record of thin dynamic holographic grating with asymmetrical fringe profile in optical feedback loop with TV-closure | In this paper we present results of theoretical and experimental research of dynamic holographic system based on optically-addressed liquid crystal light modulator inside optical feedback loop, which provides asymmetrization of grating's profile. We use computer-based signal loop instead of pure optical link. This approach gives us solution for hysteresis problems and significantly reduces optical scheme complexity. | We assume a CDMA downlink multiuser scenario, where the base station is equipped with multiple transmit antennas, and each user has multiple receive antennas. For this setup we propose a new, computationally effective MIMO multiuser detector for frequency selective channels. We exploit the fact that the interference mainly comes from the spatial domain, while the residual interference is due to temporal dispersion and multiuser interference. This motivates us to suppress the residual interference in a linear fashion, while combating the spatial interference iteratively. This approach is an efficient performance-complexity tradeoff between fully iterative and linear detectors. | eng_Latn | 5,502 |
System and method for adaptive bit loading in a multi-antenna orthogonal frequency division multiplexing communication system | In orthogonal frequency division multiplexing (OFDM) system, the transmitter and / or receiver communicates separate data streams on non-orthogonal spatial channels. Each spatial channel uses the same set of OFDM subcarriers, making it possible to communicate additional data using a multipath characteristic without increasing the frequency bandwidth in the spatial channel. Space - modulation assignment of frequency subcarriers are assigned dynamically to also subcarrier spatial channel basis underlying basis, to maximize the data transmission capacity of the channel. In some embodiments, each spatial channel is associated with one of a plurality of spatial diversity antenna. In other embodiments, beamforming is performed to enable transmission and / or reception of signals in space channel. | Abstract The case of exact first-order saturated designs with N ≡ 1 mod 4 observations [ N ≠ 2 s ( s + 1) + 1, s = 1,2,…] is considered. Conditions are found for the A- optimality of such designs, when the first r rows of the corresponding design matrix have a known structure. By modifying the method of Sathe and Shenoy (1989) for the case N ≡ 1 mod 4, the structure of the information matrix of the A- optimal design is found. Then, by exhaustive search, it is proved that the known D- optimal saturated design for N = 9 (Ehlich, 1964) is also A- optimal. | eng_Latn | 5,503 |
Adaptive predistortion for power amplifiers based on block-oriented model | An adaptive digital predistortion technique is presented to compensate for the distortions of High Power Amplifiers(HPA)with memory in Orthogonal Frequency Division Multiplexing(OFDM)communication systems.The proposed predistortion schemes are described by block-oriented models'Wiener model,Hammerstein model and Wiener-Hammerstein model respective-ly,where the memory adaptive predistorters are constructed for the HPA.Simulation results demonstrate that the proposed predis-tortion method can effectively realize the linearization of memory HPA,and it has satisfactory performance. | Jointly Gaussian memoryless sources are observed at N distinct terminals. The goal is to efficiently encode the observations in a distributed fashion so as to enable reconstruction of any one of the observations, say the first one, at the decoder subject to a quadratic fidelity criterion. Our main result is a precise characterization of the rate-distortion region when the covariance matrix of the sources satisfies a ?tree-structure? condition. In this situation, a natural analog-digital separation scheme optimally trades off the distributed quantization rate tuples and the distortion in the reconstruction: each encoder consists of a point-to-point Gaussian vector quantizer followed by a Slepian-Wolf binning encoder. We also provide a partial converse that suggests that the tree-structure condition is fundamental. | eng_Latn | 5,504 |
Finite ground plane effects on the radiation pattern of small microstrip arrays | The radiation characteristics of microstrip antennas consisting of two patch elements on small size substrates are studied by means of an approximate solution technique. Special attention is paid to the shielding effect due to finite ground plane diffraction. Experimental and theoretical results show that the back radiation is influenced by the sidelobe level and can further be reduced when the antenna is boxed. For a correct radiation pattern computation these diffraction effects need to be included in the design of small array as well as in that of single element antennas. | We consider a power control scheme for maximizing the information capacity of the uplink in single-cell multiuser communications with frequency-flat fading, under the assumption that the users attenuations are measured perfectly. Its main characteristics are that only one user transmits over the entire bandwidth at any particular time instant and that the users are allocated more power when their channels are good, and less when they are bad. Moreover, these features are independent of the statistics of the fading. Numerical results are presented for the case of single-path Rayleigh fading. We show that an increase in capacity over a perfectly-power controlled (Gaussian) channel can be achieved, especially if the number of users is large. By examining the bit error-rate with antipodal signalling, we show the inherent diversity in multiuser communications over fading channels. | eng_Latn | 5,505 |
Analysis of Wavelet Modulation in Frequency-Selective Fading | We consider an antipodal signaling system using wavelet modulation (WM) with scale diversity over a frequency-selective fading channel. The channel introduces a random gain for each scale. These scale gains are estimated by sending a block of pilot symbols before the data. Coherent demodulation is carried out along with maximal-ratio combining using the estimated scale gains. From the characteristic function of the resulting decision variable, we analyze the bit error performance. For the case of large signal-to-noise ratio (SNR), we obtain a closed-form expression for the bit error probability (BEP). It is seen that BEP decreases with increase in the number of pilot symbols. We also find a significant improvement in BEP with increase in the number of scales for a fixed pilot length. It is also found that, when compared with frequency diversity, WM can perform better over a certain range of SNR, with the range decreasing with increase in the number of scales. | A new structure, suitable for implementing narrow as well as moderately wide transition band FIR filters, is presented. The proposed structure leads to a saving of 20 – 40% in the number of multipliers for moderately wide transition band filters. The saving for the narrow transition band filter increases with decreasing transition width. | eng_Latn | 5,506 |
Perfect Reconstruction Filter Banks with Rational Sampling Rates in One and Two Dimensions | Multirate filter banks with integer sampling rate changes are used widely in subband coding and transmultiplexing. A more general scheme is obtained when one allows arbitrary rational sampling rate changes, leading to non-uniform division of the frequency spectrum. This paper shows how to obtain arbitrary non-uniform perfect reconstruction filter banks by building trees of divisions into two (possibly unequal) channels. The construction uses the commutativity of subsampling and upsampling. The commutativity result, which is well known in one dimension, is then extended to two dimensions.© (1989) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only. | In this article,we use the Fourier flexible functional form to analyze the efficiency changes of 12 share-holding commercial banks whose branches are expanding quickly.We find that,the fast increase of the numbers and the average scales of bank branches both have significantly positive effects on bank cost efficiencies.During 2000 to 2005,the cost efficiency of the 12 banks as a whole increased in a fluctuant way,and there is a relatively big increase of the efficiency in the latter half of the period compared to the former half. | eng_Latn | 5,507 |
Interference cancellation for mobile dispersive channels | A robust interference canceller for Multi-Carrier Code Division Multiple Access (MC-CDMA) using Orthogonal Frequency Division Multiplexing (OFDM) in Rayleigh fading is proposed. This interference canceller is robust in the sense that it cancels Inter-Carriers Interference (ICI) and is suitable for use in dispersive channels. To come up the effects of the signal dispersion, Doppler shifts and delay spreads on the performance of MC-CDMA systems over mobile fading channels, this interference canceller exploits the merit of the orthogonal signaling and pilot signals to evaluate the channel parameters. This interface canceller is well suited to work in iterative turbo interference cancellation. | DG-energized distribution feeder islands are generally not desired. Anti-islanding schemes based on local detection have significant shortcomings, and can only detect an island after it occurs. A Coordinated Direct Transfer Trip scheme can avoid islanding altogether, but becomes very complex if a feeder is reconfigurable. | eng_Latn | 5,508 |
Transponder information feedback method, apparatus and system for multi-carrier | The embodiment of the invention discloses a method, device and system for feeding back multi-carrier response messages, relates to the technical field of communication and provides an innovative feedback and transmission scheme of response messages under the condition of carrier aggregation. The method for feeding back the multi-carrier response messages provided by the embodiment of the invention comprises the following steps: determining feedback states of the response messages in accordance with response messages of each downlink member carrier, wherein the feedback states at least comprise a first state and a second state, and each downlink member carrier comprises at least one preset member carrier and/or at least one non-preset member carrier; and generating to-be-transmitted response messages in accordance with the feedback states and sending the to-be-transmitted response messages in an uplink direction. | Abstract This paper presents a design method for a state observer of max-plus linear systems based on the observation of the input and the output, by assuming the knowledge of the system matrices. The observer design is done in an analogous way to the observer method for classical linear system. The paper will be concluded by an illustration. | eng_Latn | 5,509 |
Regularized Channel Inversion for Multiple-Antenna users in Multiuser MIMO Downlink | Channel inversion is one of the simplest techniques for multiuser downlink systems with single-antenna users. In this paper, we extend the regularized channel inversion technique developed for the single-antenna user case to multiuser multiple- input multiple-output (MIMO) channels with multiple-antenna users. We first employ the multiuser preprocessing to project the multiuser signals near the null space of the unintended users based on the MMSE criterion, and then the single-user preprocessing is applied to the decomposed MIMO interference channels. In order to reduce the complexity, we focus on non- iterative solutions for the multiuser transmit beamforming and use a linear receiver based on an MMSE criterion. Simulation results show that the proposed scheme outperforms existing joint iterative algorithms in most multiuser configurations. | This paper studies the secure multiterminal source coding problem with actions. In particular, one main encoder observes an independent and identically distributed (i.i.d.) source Xn and wishes to compress this source lossyly to the decoder. Another encoder observes the source Yn and wants to compress this source losslessly to the decoder. A passive eavesdropper having access to the side information Zn can observe the information bits sent by the main encoder. In this scenario, the decoder is allowed to choose actions affecting the correlated source Yn and the side information Zn. For this problem, we characterize the optimal rate-distortion-cost-leakage region for a discrete memoryless setting. | eng_Latn | 5,510 |
Time-domain characteristics of slotted-waveguide leaky-wave antennas | A general asymptotic theory is presented to describe the time-domain behavior of leaky transmission lines and antennas. The results are interpreted via a simple geometric construct and data are presented for the particular case of time-domain radiation from a slotted-waveguide antenna. The example data are obtained both experimentally and numerically, with the expected phenomenology demonstrated via time-frequency processing. | Deterministic network calculus (DNC) is not suitable for deriving performance guarantees for wireless networks due to their inherently random behaviors. In this paper, we develop a method for Quality of Service (QoS) analysis of wireless channels subject to Rayleigh fading based on stochastic network calculus. We provide closed-form stochastic service curve for the Rayleigh fading channel. With this service curve, we derive stochastic delay and backlog bounds. Simulation results verify that the bounds are reasonably tight. Moreover, through numerical experiments, we show the method is not only capable of deriving stochastic performance bounds, but also can provide guidelines for designing transmission strategies in wireless networks. | eng_Latn | 5,511 |
Single-channel control of a two-channel system | Using elementary systems concepts, a new derivation is given of a recent result [1] characterizing those two-channel systems which can be made single-channel controllable with output feedback. | We present a symbol synchronization scheme using wavelets that completely eliminates the pattern-dependent jitter. This is achieved by obtaining the optimal pre-filter using a particular linear combination of the wavelet and its translates. We further investigate synchronization schemes for the case where both the scaling function and wavelet are used simultaneously as shaping pulses for modulation, and explicit expressions for the variance of the timing jitter in the tracking mode are derived. The results are then generalized to the case where shaping pulses are produced by splitting the spectrum of a shift orthogonal function. | eng_Latn | 5,512 |
Time-average control of martingale problems: the Hamilton-Jacobi-Bellman equation | Martingale methods are used to extend the applicability of the Hamilton-Jacobi-Bellman equation to processes given as solutions of a martingale problem. Sufficient conditions are given for both upper and lower bounds on the optimal long-run average cost which are combined to give sufficient conditions under which the HJB equation yields optimality of the cost. Controlled diffusions and controlled queues provide examples of such processes | In this paper we develop closed-form approximations for the coded BER in bit-interleaved coded modulation (BICM) transmission over Rayleigh fading channels. To obtain the desired expressions we apply the so-called saddle point approximation and use analytical forms of the probability density functions (PDF) of the reliability metrics. Numerical examples illustrate the accuracy of the proposed method. | eng_Latn | 5,513 |
Transport in molecular transistors: Symmetry effects and nonlinearities | We report first-principles calculations of the current-voltage and current-gate-field characteristics of model molecular transistors to explore the factors that control current amplification and other properties. We show that both the position and amplitude of resonant peaks are modified by the use of substituents that affect the symmetry and dipole moments of the molecules, and allow a linear versus nonlinear Stark effect. In addition, strong nonlinearities arise at large source-drain currents. | Army tactic to expanding the mobile battlefield has created a demand for a highly mobile network centric communication system that provides peer-to-peer communications. To enable this network connectivity over satellite communications (SATCOM) requires a sophisticated scheduling mechanism of satellite resources. The challenge with this new method of satellite utilization is to maximize capacity by dynamically allocating just enough resources between user terminals. Various dynamic bandwidth allocation algorithms have been proposed to optimize ephemeral satellite links. But, ultimately, the determination of signal-to-noise and individual transmitter and receiver channel conditions must be accurately determined. This paper will identify the satellite link variables of a dynamic multi-frequency time division multiple access (MF-TDMA) system and the impact of these variables on determining the accuracy of the channel estimates | eng_Latn | 5,514 |
Student adaptation to problem-based learning in an entry-level master's physical therapy program | The purpose of this study was to describe physical therapy students' perceptions of how they were adapting to problem-based learning in an entry-level Master's program. Fifty-one students wrote weekly journal entries about their learning during their first academic unit. Three faculty members independently read and coded the entries and worked together to form categories and themes. Member checking was used to further verify the data interpretation. Tutorial sessions, evaluations, clinical experiences, and accessing resources were the most frequently mentioned learning events. The students were initially overwhelmed by the program demands, but quickly developed strategies to deal with each new challenge. In the process, they gained confidence and, by the end of the unit, acknowledged their significant accomplishments. The themes associated with the adaptation to problem-based learning included the students' need to: establish their own learning structure, learn more efficient and effective means of access... | Selected mapping (SLM) and partial transmit sequence ::: (PTS) are well-known techniques for peak-power reduction ::: in orthogonal frequency-division multiplexing (OFDM). We ::: derive a simplified maximum likelihood (ML) decoder for SLM ::: and PTS that operates without side information. This decoder ::: exploits the fact that the modulation symbols belong to a given ::: constellation and that the multiple signals generated by the PTS or ::: SLM processes are widely different in a Hamming distance sense. ::: Pairwise error probability (PEP) analysis suggests how SLM and ::: PTS vectors should be chosen. The decoder performs well over ::: additive white Gaussian noise (AWGN) channels, fading channels, ::: and amplifier nonlinearities. | eng_Latn | 5,515 |
DRhoGEF2 encodes a member of the Dbl family of oncogenes and controls cell shape changes during gastrulation in Drosophila. | We have identified a gene, DRhoGEF2, which encodes a putative guanine nucleotide exchange factor belonging to the Dbl family of oncogenes. DRhoGEF2 function is essential for the coordination of cell shape changes during gastrulation. In the absence of maternal DRhoGEF2 gene activity, mesodermal and endodermal primordia fail to invaginate. The phenotype seen in DRhoGEF2 mutants is more severe than the defects associated with mutations in two previously identified gastrulation genes, folded gastrulation and concertina, suggesting that DRhoGEF2 acts in a signaling pathway independent of these genes. Expression of dominant-negative DRhoA during gastrulation results in phenocopies of the DRhoGEF2 mutant, suggesting that a signaling cascade involving DRhoGEF2 and the small GTPase DRhoA is responsible for the regulation of cell shape changes during early Drosophila morphogenesis. | The objective of this paper is to determine the ranging performance of the upcoming fifth generation (5G) signal. In order to do so, it is required to define 5G correlator outputs mathematical models. 5G systems will use OFDM (Orthogonal Frequency Division Multiplexing) signals; in the literature, mathematical models of OFDM signals are developed at the different receiver signal processing stages. These models assumed that the propagation channel is constant over an OFDM symbol; nevertheless, an in-depth study of QuaDRiGa, a 5G compliant propagation channel simulator, invalidates this hypothesis. Therefore, in this paper, mathematical models are developed that take into account the channel evolution. The focus is given on correlator outputs and results are applied to the computation of 5G based pseudo range accuracy. | eng_Latn | 5,516 |
A DEMOUNTABLE WAVE ABSORBER FOR WAVE FLUMES AND BASINS | Passive wave absorption is an integral component of the physical modeling environment, used to minimise unwanted reflections of wave energy that compromise test results. This paper reviews data for methods of passive absorbers and then extends this knowledge through the design and implementation of a device that can be removed from the working water surface. The modeling tests that were carried out in this paper demonstrate that a parabolic spending beach can perform by absorbing waves with coefficients of reflection Cr(energy) significantly <10%. | We consider a power control scheme for maximizing the information capacity of the uplink in single-cell multiuser communications with frequency-flat fading, under the assumption that the users attenuations are measured perfectly. Its main characteristics are that only one user transmits over the entire bandwidth at any particular time instant and that the users are allocated more power when their channels are good, and less when they are bad. Moreover, these features are independent of the statistics of the fading. Numerical results are presented for the case of single-path Rayleigh fading. We show that an increase in capacity over a perfectly-power controlled (Gaussian) channel can be achieved, especially if the number of users is large. By examining the bit error-rate with antipodal signalling, we show the inherent diversity in multiuser communications over fading channels. | yue_Hant | 5,517 |
Analysis of Noiseless Static Optical C2DMA Correlation Receivers Using Fiber Bragg Grating or Multimode Step Index Fiber under the Effect of Pulse Broadening | Optical communications is becoming an increasingly popular technique to transmit data. In our daily life we share useful data by using optical networks. However, a common problem that system face is dispersion. In this work, we discuss some forms of dispersion in ordinary fibers and Fiber Bragg Grating (FBG). In optical communication systems, FBG plays a vital role as filters, dispersion compensators and flatteners gain. The performance analysis of static 1D/2D wavelength hopping/time spreading CDMA static is introduced. The probability of error is computed for general systems based on asymmetric prime-hop codes (APHCs). A comparison between FBG and multimode step index fibers reveals, in general, that FBG is one of the most applicable components to compensate dispersion losses in optical communication systems. Furthermore, it is better than multimode and single-mode fibers. | We study a new technique for optimal data compression subject to conditions of causality and different types of memory. The technique is based on the assumption that some information about compressed data can be obtained from a solution of the associated problem without constraints of causality and memory. This allows us to consider two separate problem related to compression and de- compression subject to those constraints. Their solutions are given and the analysis of the associated errors is provided. Keywords—stochastic signals, optimization problems in signal processing. | eng_Latn | 5,518 |
Unambiguous Two Body Fix Methods Derived From Crystallographic Principles | Three methods for obtaining a two body fix are presented. For practical use a calculator with magnetic card capacity is necessary. Advantages of the methods are: One simple rule covering all positions is sufficient to avoid ambiguity, the methods can be used in all positions, an approximate position is not necessary, and the fix is calculated directly. One method employs rotation of a spherical triangle and two methods are based on vector calculation. | A geometric approach in the design of codebooks for OR frequency-hopping multiple-access (FHMA) channels is developed by treating a signal matrix as a finite set of distinct points. The relationship among the parameters of an interference-free j-distinguishable-point codebook, j>or=1, is established by using coordinate-free arguments. Geometry induced by such a codebook is characterized, and the design of a well-structured j-distinguishable-point codebook is related to a block design problem. It is shown that a well-structured 1-distinguishable-point codebook implies the axiom system of a finite affine plane. > | eng_Latn | 5,519 |
Efficient full-wave electromagnetic analysis via model-order reduction of fast integral transforms | An efficient full-wave electromagnetic analysis tool would be useful in many aspects of engineering design. Development of integral-equation based tools has been hampered by the high computational complexity of dense matrix representations and difficulty in obtaining and utilizing the frequency-domain response. In this paper we demonstrate that an algorithm based on application of a novel model-order reduction scheme directly to the sparse model generated by a fast integral transform has significant advantages for frequency- and time-domain simulation. | MIMO-OFDM is a promising technique for broadband communications over mobile wireless channel. In this paper, we investigate the channel estimation problem for MIMO-OFDM systems. We proposed a novel EM (expectation maximization)-based channel estimation method. This proposed method employs the poly-nomial channel model along with the EM-based algorithm and makes a tradeoff between the computational complexity and the performance of estimation accuracy. Computer simulations show that, compared with the traditional EM-based channel estimation, the novel method has a great advantage of estimation accuracy. | eng_Latn | 5,520 |
On the quenching behaviour of a semilinear wave equation modelling MEMS technology | This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Discrete and Continuous Dynamical Systems - Series A following peer review. The definitive publisher-authenticated version 2015, 35(3), pp. 1009-1037 is available online at: http://dx.doi.org/10.3934/dcds.2015.35.1009 | We investigate multirate multicarrier code-division multiple-access (MC-CDMA) downlink systems with multicode transmission. Specifically, we design a new linear equalizer that outperforms the minimum mean-squared error (MMSE) per-carrier equalizer, without requiring the spreading codes of the interfering users. The complexity of this new linear equalizer is similar to that of the MMSE per-user equalizer, which however needs the spreading codes of the interfering users. Simulation results validate the effectiveness of the proposed equalizer, especially when there are few interfering users. | eng_Latn | 5,521 |
Frequency Reuse over a Single TV White Space Channel | By following the discussions on homogeneous coexistence in the previous chapter, we continue investigating this issue in this chapter, but in a slightly-different network environment where the available spectrum is insufficient to satisfy the QoS requirements of multiple CR networks and they may have to share a single TVWS channel. When multiple co-located CR networks operate in the same swath of white-space (or unlicensed) spectrum with little or no direct coordination, co-channel self-coexistence is a challenging problem. | This paper introduces the system of digital broadcasting stream,especially notes the scrambling mechanism and the detail principle.Using FPGA as the main chip,and other additional chips,a PCB board has been constructed.It has been tested that the design and the processed data are successful.So this paper has some engineering value. | eng_Latn | 5,522 |
Joint mode selection and rate control for video transmission over packet loss network | In this paper, we first present a statistics analysis of the picture distortion caused by quantization, channel errors and subsequent error propagation, and propose rate-distortion (R-D) estimation models which are functions of two parameters, i.e. quantization step and intra refreshing ratio. Second, based on our proposed R-D models, a joint optimal quantization step and intra refreshing ratio selection algorithm is developed by using Lagrange multiplier theory. Next, a novel rate control algorithm, combined with macroblock (MB) coding mode selection, is proposed. The algorithm focuses on bit allocation at group of pictures (GOP) level and picture level to improve the encoding quality, and the MB mode selection addresses improving the local subjective quality within a picture. Finally, extensive simulation results show that our algorithm can make the encoder adapting itself in time to the variation of the channel bandwidth and significantly improve the end-to-end video quality over packet loss network. | In this paper we propose practical algorithms for optimization under unitary matrix constraint. This type of constrained optimization is needed in many signal processing applications. Steepest descent and conjugate gradient algorithms on the Lie group of unitary matrices are introduced. They exploit the Lie group properties in order to reduce the computational cost. Simulation examples on signal separation in MIMO systems demonstrate the fast convergence and the ability to satisfy the constraint with high fidelity. | eng_Latn | 5,523 |
The Structural Basis for mRNA Recognition and Cleavage by the Ribosome-Dependent Endonuclease RelE | Translational control is widely used to adjust gene expression levels. During the stringent response in bacteria, mRNA is degraded on the ribosome by the ribosome-dependent endonuclease, RelE. The molecular basis for recognition of the ribosome and mRNA by RelE and the mechanism of cleavage are unknown. Here, we present crystal structures of E. coli RelE in isolation (2.5 A) and bound to programmed Thermus thermophilus 70S ribosomes before (3.3 A) and after (3.6 A) cleavage. RelE occupies the A site and causes cleavage of mRNA after the second nucleotide of the codon by reorienting and activating the mRNA for 2′-OH-induced hydrolysis. Stacking of A site codon bases with conserved residues in RelE and 16S rRNA explains the requirement for the ribosome in catalysis and the subtle sequence specificity of the reaction. These structures provide detailed insight into the translational regulation on the bacterial ribosome by mRNA cleavage. | In this paper, we consider utilizing the space-time codes in the wideband CDMA system. We assume that there are multiple resolvable paths in the frequency selective fading channel. Analytical results show that in addition to spatial diversity, another diversity gain called multipath diversity is achievable. Performance criterion for full space multipath diversity gain is analyzed. We consider both the case that the receiver has the ideal channel state information and the case that there are errors in the channel state information available to the receiver. A RAKE receiver is used in the CDMA system to gain the multipath diversity. We derive the generalized RAKE receiver structure for the space-time block coding (STBC) coded wideband CDMA systems. The simulation results demonstrate the additional gain guaranteed by the multipath diversity. | eng_Latn | 5,524 |
The secrecy capacity of the MIMO wiretap channel | We consider the MIMO wiretap channel, that is a MIMO broadcast channel where the transmitter sends some confidential information to one user which is a legitimate receiver, while the other user is an eavesdropper. Perfect secrecy is achieved when the transmitter and the legitimate receiver can communicate at some positive rate, while insuring that the eavesdropper gets zero bits of information. In this paper, we compute the perfect secrecy capacity of the multiple antenna MIMO broadcast channel, where the number of antennas is arbitrary for both the transmitter and the two receivers. Our technique involves a careful study of a Sato-like upper bound via the solution of a certain algebraic Riccati equation. | We show <-50 dB AM-to-PM conversion over a wide photocurrent range in MUTC photodiodes. By controlling the AM-to-PM coefficient minimum, we generate 15 dBm microwave power with 60 dB AM rejection onto the microwave phase. | eng_Latn | 5,525 |
Value of Doppler Ultrasound of Inferior and Superior Mesenteric Arteries in Diagnosis and Treatment of Ulcerative Colitis | Objective To study the changes in parameters of blood flow and frequency-spectrum appearance in superior mesenteric artery (SMA)and inferior mesenteric artery(IMA) in the patients with ulcerative colitis(UC). Methods The parameters of blood flow and frequency-spectrum of SMA and IMA in 16 cases of patients with UC were observed before and after treatment, and 10 healthy volunteers served as control. Results The parameters of blood flow of IMA in patients with left half colon UC (9 cases) and all colon UC (7 cases) significantly changed after treatment(P0.01), and compared with control, there also was a significant difference in these parameters. Only resistance index (RI) and pulsatility index (PI) in the parameters of blood flow of SMA significantly changed (P0.01) in the patients with whole colon UC. Conclusions Doppler ultrasound of SMA and IMA can be used to evaluate the lesion area and the treatment efficacy in the patients with infectious diseases of colon. | In this paper, we study two important metrics in multiple-input multiple-output (MIMO) time-varying Rayleigh flat fading channels. One is the eigen-channel, and the other is the instantaneous mutual information (IMI). Their second-order statistics, such as the correlation coefficient, level crossing rate (LCR), and average fade/outage duration, are investigated, assuming a general nonisotropic scattering environment. Exact closed-form expressions are derived and Monte Carlo simulations are provided to verify the accuracy of the analytical results. For the eigen-channels, we found they tend to be spatio-temporally uncorrelated in large MIMO systems. For the IMI, the results show that its correlation coefficient can be well approximated by the squared amplitude of the correlation coefficient of the channel, under certain conditions. Moreover, we also found the LCR of IMI is much more sensitive to the scattering environment than that of each eigen-channel. | eng_Latn | 5,526 |
Method and system for reducing message instances | A method and system for transmitting a data having a message instance reduction is disclosed. Wireless network messages avoids the replication of the message using the target identifiers and message pointers to transmit message data to a plurality of mobile units. In order to increase the efficiency in the case of duplicate message, a pointer to the message can be associated with a plurality of target identifier. | Discussed inthis paperistheparameter estimation problem ofcomplex LFM signals based on cyclic-correlati on transform under multipath conditions. First, weanalyzed thecyclic statistics ofcomplex LFM signals andconstructed theestimator combining signal separation technology forcycle frequency domain with autocorrelated cyclic correlation amplitude, then, we analyzed theperformances oftheestimator anddeduced theexpression oferror variance ofchirp-rate estimate, andfinally we workedoutthecharacteristics ofthe estimator through computer simulation. Theresult isin agreement withtheanalytic results. 2.Signal model Lettheobserved signal x(t)bemodeled as M x(t) =y(t) +n(t) = E a.s(t -ri )+n(t) i=M M =Y ( aie )+ (t_-i )2 +0 )+n(t),O | eng_Latn | 5,527 |
The significance of sampling biases on calculated monthly mean oceanic surface heat fluxes | The possible influence of spatial gradients and seasonal and diurnal cycles in basic meteorological parameters on the accuracy of monthly five degree latitude–longitude mean ocean surface flux calculations is explored. A simple formalism for assessing the importance of these possible biases is outlined. Data for two sample eastern Pacific regions shows possibly significant biases in one or more variables. The effect of the bias on the 20-year means of the fluxes would appear to be less than 1 % of the variance or about 10% of the mean. The influence of the biases on individual monthly means could be far greater depending upon the number and distribution of available observations. It is suggested that in tropical and subtropical regions free of tropical storms about eleven observations is the minimum number of observations to assure the accuracy of individual monthly fluxes. DOI: 10.1111/j.2153-3490.1981.tb01745.x | Selected mapping (SLM) and partial transmit sequence ::: (PTS) are well-known techniques for peak-power reduction ::: in orthogonal frequency-division multiplexing (OFDM). We ::: derive a simplified maximum likelihood (ML) decoder for SLM ::: and PTS that operates without side information. This decoder ::: exploits the fact that the modulation symbols belong to a given ::: constellation and that the multiple signals generated by the PTS or ::: SLM processes are widely different in a Hamming distance sense. ::: Pairwise error probability (PEP) analysis suggests how SLM and ::: PTS vectors should be chosen. The decoder performs well over ::: additive white Gaussian noise (AWGN) channels, fading channels, ::: and amplifier nonlinearities. | eng_Latn | 5,528 |
Compressive channel estimation using band approximation for OFDM systems | In this paper we propose a compressive channel estimation for fast fading channel in orthogonal frequency division multiplexing (OFDM) systems. We formulate the sparse compressive sensing (CS) problem by exploiting the delay-Doppler sparse structure of the doubly dispersive channel. To combat the severe inter-carrier interference (ICI) caused by the Doppler shift, this estimator is based on the banded matrix model in frequency domain. The band approximation enable the CS technology to obtain a precise estimation of the fast fading channel with feasible complexity. We also utilize the random grouped pilot pattern, which allows a direct construction of measurement matrix for the proposed model. Simulation results demonstrate that our method achieves significant performance gain when the Doppler spread is at high level. | According to the technical requirement of 4 kW Permanent Magnet Synchronous Motor (PMSM), which is used for the pulse-on of the hybrid-electric vehicle, a vector control system is presented in the paper. The SVPWM arithmetic is adopted for the design of the system, which is based on DSP and includes the current detection, speed detection. Following the result of testing, the rise time of the speed is 0.1s and the overshoot of the speed is below 4%. The result proves that the control system can meet the requirements of the pulse-on of the electric vehicle. | eng_Latn | 5,529 |
Receiver for DBS With Digital Audio Signals | The Direct Broadcasting Satellite (DBS) service has just started in Japan. The digital audio signals, which provide higher fidelity sound than FM broadcasting, are directly transmitted to homes by the satellite BS-2 with low noise, ghost free video signals. | This paper studies the secure multiterminal source coding problem with actions. In particular, one main encoder observes an independent and identically distributed (i.i.d.) source Xn and wishes to compress this source lossyly to the decoder. Another encoder observes the source Yn and wants to compress this source losslessly to the decoder. A passive eavesdropper having access to the side information Zn can observe the information bits sent by the main encoder. In this scenario, the decoder is allowed to choose actions affecting the correlated source Yn and the side information Zn. For this problem, we characterize the optimal rate-distortion-cost-leakage region for a discrete memoryless setting. | eng_Latn | 5,530 |
Method for Operating Sub-carrier in Multi-cell Based on Orthogonal Frequency Division Multiplexing System | PURPOSE: A method for operating a sub-carrier in a multi-cell based on an OFDM(Orthogonal Frequency Division Multiplexing) system is provided to distribute power strength and sub-carriers, to minimize an interference between cells, thereby increasing transmission efficiency of data transmitted to each of the sub-carriers. CONSTITUTION: If the number of cells is 'N', an OFDM system defines valid sub-carriers as 'N'(S602). The OFDM system sequentially or randomly assigns service classes defined as 'N' to each base station(S604). The OFDM system perceives a user state within cells through the base stations(S606). If one user exists(S608), the OFDM system perceives whether the user is a boundary user(S610). If so, the OFDM system assigns one tone set to the boundary user from a service class(S612). | Abstract Recently new optimal Krylov subspace methods have been discovered for normal matrices. In light of this, novel ways to quantify nonnormality are considered in connection with various families of matrices. We use as a criterion how, for a given matrix, these iterative methods introduced can be employed via, e.g., inexpensive matrix factorizations. The unitary orbit of the set of binormal matrices provides a natural extension of normal matrices. Its elements yield polynomially normal matrices of moderate degree. In this context several matrix nearness problems arise. | eng_Latn | 5,531 |
Linear equalization of frequency selective channels using space diversity | We present, by extension of some earlier results, the expression of an upper bound on the bit error rate (BER) of a digital communication system operating on a frequency selective channel linking N mobiles to an M/sup th/ order space diversity receiver using optimum combining and linear equalization. The bound is then used in conjunction with a Monte-Carlo simulation to emulate the time varying realizations of the channel and evaluate the corresponding outage rate. An explicit dependency of the performance bound on the system parameters is then obtained (using multipath Rayleigh fading model) together with its relationship with the so-called "optimum" bounds of the matched filter and information theoretic capacity types. Our results seem to indicate that, in general, such a linear equalization procedure falls short of exploiting the full potential of the time diversity coding gain available with such time dispersive channels. | The passive RL form of differentiating circuit is used as a basis for the development of new forms of differentiator, in which the shunt inductance element L is simulated, and the error incurred by the series resistance R is compensated for, by a composite operational-amplifier network. An arrangement that employs only two single-ended operational amplifiers is derived. | eng_Latn | 5,532 |
Properties of spacetimes with magnetic dipoles | The properties of an asymptotically flat spacetime with a mass and a magnetic dipole are studied. We focus on the breaking of spherical symmetry by the magnetic dipole. We investigate the geometry of the spacetime through the trajectories of null geodesics and the embedding diagrams of various hypersurfaces, included constant t and r surfaces and the infinite red shift surface. We find that the effects of the magnetic dipole on the spacetime are larger at the poles than on the equator. | We assume a CDMA downlink multiuser scenario, where the base station is equipped with multiple transmit antennas, and each user has multiple receive antennas. For this setup we propose a new, computationally effective MIMO multiuser detector for frequency selective channels. We exploit the fact that the interference mainly comes from the spatial domain, while the residual interference is due to temporal dispersion and multiuser interference. This motivates us to suppress the residual interference in a linear fashion, while combating the spatial interference iteratively. This approach is an efficient performance-complexity tradeoff between fully iterative and linear detectors. | eng_Latn | 5,533 |
Equation a*a = P(a) in some algebras with involution | In this paper, we show that if a is an element of C-algebra with a proper involution ∗, satisfying the equation a∗a=P(a), where P is a complex polynomial whose degree ∉{0,2}, then a is algebraic an... | The design of the LTE physical layer (PHY) is heavily influenced by the requirements for high peak transmission rate (100 Mbps DL/50 Mbps UL), spectral efficiency and multiple channel bandwidths (1.25–20 MHz). Unfortunately, the existing WCDMA turbo interleaver does not permit an efficient high throughput implementation. That is why the 3rd Generation Partnership Project (3GPP) has proposed the quadratic polynomial permutation (QPP) interleaver to rectify this situation. In this paper, we will study the performances of QPP interleaver for LTE encoder channel for different configurations of LTE system and we study the effect of LTE channel turbo encoder for the transmission over a wireless multipath channel. | eng_Latn | 5,534 |
A novel preamble design using LDM | In this paper, a layered preamble denoted as LP1 is proposed based on Layer Division Multiplex (LDM). The preamble is composed of two OFDM symbols. The first symbol is fixed and used for timing and frequency synchronization. The second symbol is a combination of two layers which both convey system parameters associated with system structure. Because of good cross-correlation of PN sequences with different generator polynomials, the interference of each layer can be ignored. Timing synchronization and fractional frequency offset (FFO) estimation are done simultaneously in the time domain using guard interval (GI). An IFFT method is proposed to implement integer frequency offset (IFO) estimation and phase parameter generation under fading channels. Correlation method is adopted for signaling demodulation in frequency domain after phase compensation. Simulation results show that the proposed preamble can achieve more flexibility and greater robustness than P1 in DVB-T2 typical channel with low SNR. | Based on a sample of 200 leader-member dyads, we examined the antecedents of leader-member exchange (LMX) agreement, including demographic similarity, deep-level similarity, leadership self-efficac... | eng_Latn | 5,535 |
Single-Carrier Incremental Relaying with Joint Tx/Rx FDE | We propose an incremental relaying scheme using joint Tx/Rx frequency-domain equalization (FDE) for single-carrier (SC) transmission. If a packet sent by a source node (S) has been correctly decoded at a relay node (R), but not at the destination node (D), retransmission is cooperatively done by S and R. Assuming that the channel state information (CSI) is shared by S, R, and D, joint Tx/Rx FDE is performed. We derive a set of optimal/suboptimal Tx/Rx FDE weights among S, R, and D, based on the minimum mean square error (MMSE) criterion under total transmit power constraint of S and R. Computer simulation verifies the effectiveness of the proposed scheme. | Abstract A detailed numerical analysis of implanted top-gate 6H–SiC JFET structures was performed revealing the influence of a non-uniform channel doping profile. Based on structural parameters extracted from simulations of the device characteristics at various bias conditions and temperatures, we obtain channel mobility parameters close to Hall data for bulk epitaxial layers. | eng_Latn | 5,536 |
Solution of scattering from homogeneous dielectric object using fast multipole method | In this paper, the method of moments (MoM) is employed to solve the combined field integral equation (CFIE) for scattering by three-dimensional homogeneous dielectric, arbitrary objects. First, the convergence of conjugate gradient (CG) method is discussed. Following this the fast multipole method (FMM) is used to reduce the memory required and computational operations. | MIMO-OFDM is a promising technique for broadband communications over mobile wireless channel. In this paper, we investigate the channel estimation problem for MIMO-OFDM systems. We proposed a novel EM (expectation maximization)-based channel estimation method. This proposed method employs the poly-nomial channel model along with the EM-based algorithm and makes a tradeoff between the computational complexity and the performance of estimation accuracy. Computer simulations show that, compared with the traditional EM-based channel estimation, the novel method has a great advantage of estimation accuracy. | eng_Latn | 5,537 |
Square-Root Generalized Eigenvalue Decomposition Processor for Leakage-Based Multi-User MIMO Precoding With Multi-Antenna Users | Multi-user multiple-input and multiple-output (MU-MIMO) precoding is an effective transmission scheme for achieving very high spectral efficiency in modern wireless communication systems. Although numerous multi-user precoder designs have been proposed over the last few decades, the signal-to-leakage-and-noise ratio (SLNR)-based precoder is known to achieve favorable performance-complexity tradeoffs. This paper presents a new generalized eigenvalue decomposition (GEVD) processor, that is, the core processing unit dominating the overall complexity in SLNR-based precoders. A low-complexity square-root algorithm is adopted to eliminate the need for matrix multiplications and matrix inversion computations, which reduces the complexity of the GEVD processor considerably. Finally, the proposed processor was designed and implemented by using a 40-nm complementary metal-oxide-semiconductor technology, which exhibited a maximum throughput rate of 1.1-M matrices/s for the MU-MIMO system. | In order to compute an optimal Kernel probability density function estimator (KDE), the plug-in method is considered in this paper. Such algorithm gives a way to optimize both the kernel and the bandwidth. Here, we propose a new procedure witch is faster than the common plug-in one. For each time, a factor J(f), which is linked to the second order derivative of the pdf, is analytically approximated. The pdf is estimated only once at the end of iterations. Different random variables with difficult distributions are generated in order to prove the efficiency of the proposed optimal estimator. These algorithms are then, applied to genetics data in order to give a better characterisation in the mean of neutrality of a given population by using the fast MISE optimal pdf estimation of the Tajima's D criterion. This criterion is a statistic allowing the estimation of the genetic neutrality of the sample population. | eng_Latn | 5,538 |
LDPC-based coded cooperative jamming codes | We present a practical coded cooperative jamming scheme for the problem of secure communications over the two-way wiretap channel. We design low-density parity-check (LDPC) based codes whose codewords interfere at the eavesdropper's terminal, thus providing secrecy. We show that our scheme can guarantee low information leakage rate, and we assess its precise performance for classical and spatially coupled LDPC codes. | In this paper, a new distribution system for Chinese medicine is described. The system is devided into two layers,a PC is used in up layer for supervising of message and control, a PLC is used in bottom layer for controlling task. A special medicine\|down mechnism,distributing robot and control system are also introduced. | eng_Latn | 5,539 |
Mirroring Hypothesis and Integrality: Evidence from Tesla Motors | Viewing the relationship between vertical integration and product architecture (integrality and modularity) as the “mirroring” hypothesis, we examine the case of Tesla Motors. Besides dedicating an... | In this paper, a new method is proposed to adaptively estimate the number of transmit antennas in cognitive radios and surveillance systems. It employs Schur complement to test the linearly independence of the new coming data with the previous data set. ?2 test is conducted based on the statistics of Schur complement variable. Last, Monte Carlo simulation is employed to test the performance of the estimator under different scenarios. | eng_Latn | 5,540 |
Low-complexity, full-diversity space-time-frequency block codes for MIMO-OFDM | We present a new class of space-time-frequency block codes (STFBC) for multiantenna orthogonal frequency division multiplexing (MIMO-OFDM) transmissions over frequency selective Rayleigh fading channels. We show that these codes admit symbol-by-symbol decoding (decoupled decoding) when the number of nonzero taps of the channel impulse response is equal to two and they admit reduced complexity (1/2 of that of known schemes) for more than two channel taps. We also present simulation results to show that our codes perform better than the known codes. | This paper presents a method for modeling MOS combinational logic gates. Analyses are given for power consumption, output response delay, output response waveshape, and input capacitance. The models are both computationally efficient and accurate, typically lying within 5% of SPICE estimates. They are pertinent to simulation and optimization applications. A general macromodeling software support package is described. A related paper [1] discusses a circuit optimizer based on these models. | eng_Latn | 5,541 |
Exploiting Prior Knowledge in The Recovery of Signals from Noisy Random Projections | It has been recently shown that if a, signal can be compressed in some basis, then it can be reconstructed in such basis from, a certain number of random, projections. By allowing additional distortion, this holds even if the projections are corrupted by noise. We extend this result by showing that it is possible to exploit prior knowledge (e.g., if the signal is a realization of a stochastic process,) to significantly improve reconstruction performance. This is done in a fashion resembling standard joint source-channel coding of digital sources. Moreover, the exploitation of such knowledge allows for reconstruction in bases where the signal is not sparse | The performance of a pragmatic carrier phase estimation algorithm is evaluated over a range of SNRs. The optimal SNR regions for MQAM are compared to an AWGN channel observing gains of up to 40% in throughput. | eng_Latn | 5,542 |
Role of a Faculty of Engineering in the transfer of technology (University of Dar-es-Salaam) | Meeting: Eastern African Working Group Meeting on Transfer of Technology, 16-20 Sept. 1981, Arusha, TZ | We propose an incremental relaying scheme using joint Tx/Rx frequency-domain equalization (FDE) for single-carrier (SC) transmission. If a packet sent by a source node (S) has been correctly decoded at a relay node (R), but not at the destination node (D), retransmission is cooperatively done by S and R. Assuming that the channel state information (CSI) is shared by S, R, and D, joint Tx/Rx FDE is performed. We derive a set of optimal/suboptimal Tx/Rx FDE weights among S, R, and D, based on the minimum mean square error (MMSE) criterion under total transmit power constraint of S and R. Computer simulation verifies the effectiveness of the proposed scheme. | eng_Latn | 5,543 |
Scale Factor Dependencies in Quantum Dipole Coupled Lee-Goldburg Cross-Polarization Experiments | Lee-Goldburg cross polarization is used in many NMR experiments to determine internuclear distances. Distances calculated from frequency peaks in the dipolar coupled dimension are subject to scale factors. Experimentally determined scale factors can differ significantly from the theoreticalyy useful value described in the literature. In this work, simulations using SPINEVOLUTION explore effects of varying experimental parameters of frequency offset and cross polarization powers on $^{15}$N-H systems. Experimental data is used to corroborate the simulation. The scale factor is shown not only to depend on the offset frequency but also the cross polarization powers of the observed nucleus. Scale factors greater than one are shown to be possible in simulated data, though such factors obscure the determination of internuclear distances. | The design of the LTE physical layer (PHY) is heavily influenced by the requirements for high peak transmission rate (100 Mbps DL/50 Mbps UL), spectral efficiency and multiple channel bandwidths (1.25–20 MHz). Unfortunately, the existing WCDMA turbo interleaver does not permit an efficient high throughput implementation. That is why the 3rd Generation Partnership Project (3GPP) has proposed the quadratic polynomial permutation (QPP) interleaver to rectify this situation. In this paper, we will study the performances of QPP interleaver for LTE encoder channel for different configurations of LTE system and we study the effect of LTE channel turbo encoder for the transmission over a wireless multipath channel. | eng_Latn | 5,544 |
Comb-like scattering realized by cylindrical plasmonic multilayers | We study the comb-like scattering response of cylindrical multilayered plasmonic nanostructures. Through oxide semiconductors with different doping levels, the comb-like scattering made up of multiple Fano resonances can be achieved with enough scattering excursion. Each sharp Fano resonance is associated with a degenerate state between a bipolar cloaking and a bipolar resonant scattering. When the semiconductor shell is thin enough, the scattering response is independent of the core and background materials, and even the size of the nanostructure under quasi-static conditions. The physical mechanism of the proposed comb-like device is explained by using full-wave electromagnetic simulation. Moreover, the scattering cross section of the device with a considerable thickness can exhibit reliable comb-like scattering under different thicknesses and material parameters, which is suitable for optical tagging applications. | Abstract Optical wireless communication technologies are finding a greater interest and wider attention within the research community of late. In this paper, we investigate the performance of a free space optical communication system over a generic propagation model called M -distributed channel in the presence of atmospheric turbulence. We analyzed a Subcarrier intensity-modulated free-space optical (SIM-FSO) communication system using DPSK and closed form expressions are derived using Meijer G function for bit error rate, channel capacity and outage probability for M -distribution. | eng_Latn | 5,545 |
Nonlinearity and in-line residual dispersion tolerance of /spl pi/-AP-RZ and CS-RZ modulation formats in 40-Gb/s transmission over standard single-mode fiber | We achieved a 40% increase in 40-Gb/s transmission distance in links with exact dispersion compensation through suppression of nonlinear distortion by using the alternate-phase return-to-zero (AP-RZ) modulation format. A novel experimental technique was used to compare in-line residual dispersion tolerances, and it was found that AP-RZ is less dispersion tolerant than conventional RZ and carrier-suppressed RZ (CS-RZ) when both linear and nonlinear transmission are considered. Maximum dispersion tolerance of /spl plusmn/50 ps/nm over 300 km was shown to be possible using CS-RZ. | In this paper we compute the packet error probability induced in a frequency hopped spread spectrum packet radio network. The frequency spectrum is divided into q frequency bins and the packets are divided into M bytes each. Every user in the network sends each of the M bytes of his packet at a frequency chosen among the q frequencies with equal probability, and independently of the frequencies chosen for other bytes (i.e. memoryless frequency-hopping patterns). Furthermore, statistically independent frequency hopping patterns correspond to different users in the network. We show that, although memoryless frequency hopping patterns are utilized, the byte errors at the receiver are not statistically independent" instead they exhibit a Markovian structure. We also compute the packet error probability induced when Reed-Solomon codes are used for the encoding of the packets. | eng_Latn | 5,546 |
SIGNAL SIMULATOR FOR RFI MITIGATION ALGORITHMS TESTING | With the growing demand on radio frequency interference mitigation techniques in radio astronomy, better testing tools are required. This paper presents the signal oriented simulator developed at Embry-Riddle Aeronautical University. The modular simulator is capable of simulating ground based, satellite and celestial sources with a variety of transmit IQ signals. The concept, basic modes, and a configuration of the simulator are presented. The simulator is written in class-oriented MATLAB language. | A matrix Routh-approximant modelling procedure is proposed for a multi-input multi-output system characterized by a matrix transfer function G(s), where G(s) = B(s) A −1(s) and A(s) and B(s) are matrix polynomials in s. The associated time-domain modelling procedure is also discussed. Compared with three matrix Cauer continued-fractions, the proposed method requires less computational effort. In addition, it is applicable to systems with unequal number of inputs and outputs. A demonstrative example is included. | kor_Hang | 5,547 |
The Second-Order Coding Rate of the MIMO Quasi-Static Rayleigh Fading Channel | The second-order coding rate of the multiple-input multiple-output (MIMO) quasi-static Rayleigh fading channel is studied. We tackle this problem via an information-spectrum approach and statistical bounds based on recent random matrix theory techniques. We derive a central limit theorem (CLT) to analyze the information density in the regime where the block length $n$ and the number of transmit and receive antennas $K$ and $N$ , respectively, grow simultaneously large. This result leads to the characterization of closed-form upper and lower bounds on the optimal average error probability when the coding rate is within $ {\mathcal{ O}}(1/\sqrt {nK})$ of the asymptotic capacity. | Consider arbitrary collections A = a_1,a_2,.. .,a_n of items and Q = q_1,q_2,...,q_m (1 leqslant mn leqslant n) of queries from a totally ordered universe. The multiple rank problem involves computing for every query qi the number of items in A that have a lesser value. Our contribution is to show that the problem at hand can be solved time-optimally on meshes with multiple broadcasting. More specifically, if the collection A is siored in some order one item per processor and if Q is stored one query per processor in the leftmost frac{m} {{sqrt n }} columns of a mesh with multiple broadcasting of size sqrt n x /sqrt n, the corresponding instance of the multiple rank problem can be solved in Theta left( {m^{frac{1} {3}} n^{frac{1} {6}} } right) time. As an application we present a time-optimal algorithm to compute the histogram of a m-level gray image of size sqrt n x sqrt n in Theta left( {m^{frac{1} {3}} n^{frac{1} {6}} } right) time. | eng_Latn | 5,548 |
Time Delay Estimation Via Wasserstein Distance Minimization | Time delay estimation between signals propagating through nonlinear media is an important problem with application to radar, underwater acoustics, damage detection, and communications (to name a few). Here, we describe a simple approach for determining the time delay between two such signals via minimization of the one-dimensional Wasserstein distance. The solution can be computed efficiently digitally in $O(N)$ , or in linear time in circuitry. We demonstrate the approach in the estimation of time delay between acoustic (Lamb) waves generated in an aluminum plate, and compare to alternative approaches. | We consider the throughput performance of ARQ in interfering channels, where the signal of interest as well as the interferers are subject to independent distributed Nakagami-m block fading. The key contribution is the derivation of closedform expressions for the rate-maximized throughput. For this purpose, we employ the powerful parameterization approach from [1], allowing the problem to be solved exactly in a closedform. We also consider the scaled-power, and the interferencelimited, case. | kor_Hang | 5,549 |
Measuring method of longitudinally detected ESR signal intensities against resonant frequencies at 250 to 950 MHz in a constant microwave field | Signal intensities of longitudinally detected ESR (LODESR) of 1,1-diphenyl-2-picrylhydrazyl powder were precisely measured at 250 to 950 MHz under a constant magnetic field microwave that was applied using a single-turn coil. The LODESR signal intensity was reduced linearly due to smaller Zeeman splitting. Because the noise level was constant, the sensitivity of LODESR was approximately proportional to the resonant frequency. As far as we know, this study represents the first attempt to measure precisely the relationship between the signal intensities and resonant frequencies of ESR in an experimental condition. | This paper considers channel estimation and achievable rates for the uplink of a massive multiple-input multiple-output (MIMO) system where the base station is equipped with one-bit analog-to-digital converters (ADCs). By rewriting the nonlinear one-bit quantization using a linear expression, we first derive a simple and insightful expression for the linear minimum mean-square-error (LMMSE) channel estimator. Then employing this channel estimator, we derive a closed-form expression for the lower bound of the achievable rate for the maximum ratio combiner (MRC) receiver. Numerical results are presented to verify our analysis and show that our proposed LMMSE channel estimator outperforms the near maximum likelihood (nML) estimator proposed previously. | eng_Latn | 5,550 |
Software Stakeholder Management: It’s Not All its Coded Up to Be | If the most technologically advanced code doesn't perform to the customer's expectations, it is "a failure." This model ensures the project manager has assembled adequate intelligence for selecting realistic options in management of customer expectations. | Selected mapping (SLM) and partial transmit sequence ::: (PTS) are well-known techniques for peak-power reduction ::: in orthogonal frequency-division multiplexing (OFDM). We ::: derive a simplified maximum likelihood (ML) decoder for SLM ::: and PTS that operates without side information. This decoder ::: exploits the fact that the modulation symbols belong to a given ::: constellation and that the multiple signals generated by the PTS or ::: SLM processes are widely different in a Hamming distance sense. ::: Pairwise error probability (PEP) analysis suggests how SLM and ::: PTS vectors should be chosen. The decoder performs well over ::: additive white Gaussian noise (AWGN) channels, fading channels, ::: and amplifier nonlinearities. | eng_Latn | 5,551 |
Closed-form approximation of Coded BER in QAM-based BICM Faded Transmission | In this paper we develop closed-form approximations for the coded BER in bit-interleaved coded modulation (BICM) transmission over Rayleigh fading channels. To obtain the desired expressions we apply the so-called saddle point approximation and use analytical forms of the probability density functions (PDF) of the reliability metrics. Numerical examples illustrate the accuracy of the proposed method. | This paper presents a suitable solution of studying methods on BRBs’ critical load with finite element software．The effects of the relevant factors on the BRBs’ ultimate bearing capacity are investigated, and some practical suggestions for the design and production are provided． | eng_Latn | 5,552 |
Estimation of turbulence parameters from solar observations | The one-dimensional point spread function for long-exposure frames of the whole system atmosphere - instrument is calculated from solar limb observations using data recorded at OCA Observatory (France). It is then compared to the theoretical one deduced from the Von Karman model and various wave-front structure functions. Good agreement is found allowing to deduce the spatial coherence outer scale L0 and the Fried parameter r0. | Deterministic network calculus (DNC) is not suitable for deriving performance guarantees for wireless networks due to their inherently random behaviors. In this paper, we develop a method for Quality of Service (QoS) analysis of wireless channels subject to Rayleigh fading based on stochastic network calculus. We provide closed-form stochastic service curve for the Rayleigh fading channel. With this service curve, we derive stochastic delay and backlog bounds. Simulation results verify that the bounds are reasonably tight. Moreover, through numerical experiments, we show the method is not only capable of deriving stochastic performance bounds, but also can provide guidelines for designing transmission strategies in wireless networks. | eng_Latn | 5,553 |
Turbulence Approximation for Inhomogeneous Flows: Part I. The Clipping Approximation | Abstract A modification of the quasi-normal theory is proposed for the study of inhomogeneous turbulent flows. In this approximation realizability conditions for third-order correlations are enforced. These conditions are based on generalized Schwarz' inequalities which limit the growth of triple correlations and the approximation consists in “clipping” these last quantities when they violate their respective inequalities. By requiring that the inequalities be satisfied, we take into account the damping effect of fourth-order correlations. The equations corresponding to this approximation are derived for the case of inhomogeneous turbulence in a Boussinesq fluid with the aid of a recently proposed hypothesis for pressure correlation terms. | The purpose of this paper is to introduce a semi-blind channel estimation approach for MIMO-OFDM Systems. The proposed method is a combination of pilot and blind channel estimations on Independent Data Blocks (IDB). First, the Pilots are used to find the channel characteristics. By taking the average of subsequent pilot responses we pre-estimating the channel, and then with this pre-estimated channel characteristics data is decoded at the receiver section. In this paper instead of conventional orthogonal pilots proposed optimal pilots and instead of full data block channel estimation half data block channel is estimated using previous and present pilots and next half of data channel characteristics is estimated with interpolating present and future pilots channel, the proposed pattern, method will reduces the MSE as compared to existing conventional one. Simulation results show that the proposed method achieves higher accuracy (MSE reduced) and complexity reduced (compared to blind estimation method). | eng_Latn | 5,554 |
Channel estimation with scattered pilots in OFDM/OQAM | OFDM/OQAM is a multi-carrier modulation scheme that can be considered as an alternative to conventional OFDM with cyclic prefix (CP) for transmission over multi-path fading channels. As it requires no CP, it has the advantage of a theoretically higher spectral efficiency. Furthermore, efficient pulse shaping can also be easily implemented. However, the classical channel estimation methods used for OFDM cannot be directly applied to OFDM/OQAM. In this paper, we present an analysis of this problem and we introduce a channel estimation method using scattered pilots. The performance results are evaluated for a slow varying multi-path channel model. For both scenarios, the results of OFDM/OQAM, using 2 different pulse shaping, are compared to those of CP-OFDM. | We propose a novel machine learning based equalization algorithm for bandwidth-limited IM-DD PON in C-band. 50Gb/s/λ. PAM4 transmission is demonstrated over 20km SSMF using a 10G-class transmitter with 21dB loss budget without amplification. | eng_Latn | 5,555 |
Screening for the obstructive sleep apnea syndrome among guards in alternating work shifts | This study was conducted to appraise the prevalence of OSAS among individuals employed in alternating work shifts. The tentative diagnosis suggested by screening was validated by testing in a sleep laboratory; afflicted individuals received appropriate treatment and follow -up care. S creening conducted by administering a questionnaire suggested OSAS in 23 per cent of 218 subjects employed as sentries/guards in alternating work shifts. Individuals identified by screen ing underwent polysomnography in a sleep diagnostics laboratory in or der to confirm the tent ative diagnosis. Advanced OSAS is associated with abnormal enhancement of daytime sleepiness, which results in significant impairment of attention, mental concentration, vigilance, cognitive and job performance in afflicted individua ls employed in alternating work shifts. | Selected mapping (SLM) and partial transmit sequence ::: (PTS) are well-known techniques for peak-power reduction ::: in orthogonal frequency-division multiplexing (OFDM). We ::: derive a simplified maximum likelihood (ML) decoder for SLM ::: and PTS that operates without side information. This decoder ::: exploits the fact that the modulation symbols belong to a given ::: constellation and that the multiple signals generated by the PTS or ::: SLM processes are widely different in a Hamming distance sense. ::: Pairwise error probability (PEP) analysis suggests how SLM and ::: PTS vectors should be chosen. The decoder performs well over ::: additive white Gaussian noise (AWGN) channels, fading channels, ::: and amplifier nonlinearities. | eng_Latn | 5,556 |
Finding the Closest Lattice Point by Iterative Slicing | Most of the existing methods that are used to solve the closest lattice point problem are based on an efficient search of the lattice points. In this paper a novel alternative approach is suggested where the closest point to a given vector is found by calculating which Voronoi cell contains this vector in an iterative manner. Each iteration is made of simple “slicing” operations, using a list of the Voronoi relevant vectors that define the basic Voronoi cell of the lattice. The algorithm is guaranteed to converge to the closest lattice point in a finite number of steps. The method is suitable, for example, for decoding of multi-input multi-output (MIMO) communication problems. The average computational complexity of the proposed method is comparable to that of the efficient variants of the sphere decoder, but its computational variability is smaller. | Abstract We report on calculations of frequency gaps for mixed folded LA and TA phonons propagating perpendicular to the layers in a superlattice. We show that for certain growth directions (e.g., [011] and [012]), mini-gaps appear not only at the Brillouin-zone center and boundary, but also in the interior. Results are obtained for GaAsAlAs superlattices. | eng_Latn | 5,557 |
Position determining device, position determining method, lithographic apparatus, and method for manufacturing object | The invention relates to a position determining device, a position determining method, a lithographic apparatus, and a method for manufacturing an object. The position determining device includes a first lighting unit configured to emit light to an edge portion of a rotating substrate and a second lighting unit configured to emit light to at least one mark on a surface of the substrate. The alignment device further includes a light receiving unit disposed on a side corresponding to the surface of the substrate and configured to receive light that is emitted from the first lighting unit and then passes through a region outside the substrate and to receive light that is emitted from the second lighting unit and then reflected from the at least one mark. The position of the substrate is determined based on a result of light reception by the light receiving unit. | Selected mapping (SLM) and partial transmit sequence ::: (PTS) are well-known techniques for peak-power reduction ::: in orthogonal frequency-division multiplexing (OFDM). We ::: derive a simplified maximum likelihood (ML) decoder for SLM ::: and PTS that operates without side information. This decoder ::: exploits the fact that the modulation symbols belong to a given ::: constellation and that the multiple signals generated by the PTS or ::: SLM processes are widely different in a Hamming distance sense. ::: Pairwise error probability (PEP) analysis suggests how SLM and ::: PTS vectors should be chosen. The decoder performs well over ::: additive white Gaussian noise (AWGN) channels, fading channels, ::: and amplifier nonlinearities. | eng_Latn | 5,558 |
Performance Analysis of Joint Single Transmit and Receive Antenna Selection in Nakagami-m Fading Channels | In this paper, multi-antenna systems employing both single transmit and single receive antenna selection (single TAS/single RAS) are examined for independent and identically distributed (i.i.d.) flat Nakagami-m fading channels. In this joint selection scheme, signal transmission and reception is performed over a single communication link with the highest signal-to-noise ratio (SNR). Exact bit/symbol error rate expressions for binary modulation, M-ary phase shift keying and square M-ary quadrature amplitude modulation signals are derived by using the moment generating function based analysis method. Also, upper bounds are obtained in order to show that the investigated systems achieve full diversity orders at high SNRs. Besides, outage probability analysis is carried out for examining system capacity. Analytical results are validated by simulations. | Classification of satellite images is still an area of wide research. Nowadays, ANN has become a common tool for classification. In this paper, we have proposed an ANN-based classification algorithm for satellite images and compared the results with other algorithms like minimum distance and maximum likelihood on the basis of accuracy and Kappa coefficient. We have used Taguchi method to choose hyperparameters and optimize ANN model without affecting its robustness and classified the images into various Land-use and Land-cover classes. | eng_Latn | 5,559 |
INEQUALITY FOR TRAPEZOID TYPE RULES | Some applications of the Ostrowski inequality and a perturbed version of it for integral inequalities of the trapezoid type are given. | We consider the throughput performance of ARQ in interfering channels, where the signal of interest as well as the interferers are subject to independent distributed Nakagami-m block fading. The key contribution is the derivation of closedform expressions for the rate-maximized throughput. For this purpose, we employ the powerful parameterization approach from [1], allowing the problem to be solved exactly in a closedform. We also consider the scaled-power, and the interferencelimited, case. | kor_Hang | 5,560 |
Multiple fault diagnosis by signature recognition of time-varying residuals | A Fault Detection and Diagnosis scheme able to deal with concurrent, incipient, sensor and actuator faults is presented. The architecture allows the diagnosis whenever the system's outputs are less than the number of faults. Residual generation is achieved by taking advantage from observer-based design, whereas the classification is performed by extending the concept of directional residual towards a time-varying setting. The scheme is designed to leverage the power from both model-based and data-driven approaches while mitigating their inherent drawbacks. The performances of the proposed strategy are evaluated by employing real data coming from the TEKOB1 Thermal Plant of Kostolac, Serbia. | Channel estimation is an essential component, in which channel state information playing very important role in wireless communications. But acquiring CSI in practice is a challenging issue for massive MIMO systems. To reduce the over burden for obtaining channel impulse response of huge Multi input multi output system channel reciprocity in TDD domain is suggested, because the forward link channel data can be derived from the reverse link signal without any feedback involvement. Because of mismatches at uplink, downlink channels maintaining reciprocity in TDD systems is impractical. We study the impact of multiplicative reciprocity error for precoders (Zero forcing, MMSE and MRT) performance along with channel estimation error. In this paper effect of RF mismatches impact on linear precoders is analyzed and simulated in terms of SINR versus SNR under additive white Gaussian noise. | eng_Latn | 5,561 |
A distributed-memory parallel lattice Kinetic Monte Carlo algorithm for crystal growth applied to barite (001) face | We would like to acknowledge funding from the European Union (project SEP‐210135800), Spanish Government (projects MAT2013‐47102‐C2‐1R, CTM2013‐49796‐EXP, TEC2014‐53727‐C2‐2‐R and CSD2009‐00013), Junta de Andalucia Regional Government (project TEP3055/2012) and SCCYT‐UCA for technical support. | Army tactic to expanding the mobile battlefield has created a demand for a highly mobile network centric communication system that provides peer-to-peer communications. To enable this network connectivity over satellite communications (SATCOM) requires a sophisticated scheduling mechanism of satellite resources. The challenge with this new method of satellite utilization is to maximize capacity by dynamically allocating just enough resources between user terminals. Various dynamic bandwidth allocation algorithms have been proposed to optimize ephemeral satellite links. But, ultimately, the determination of signal-to-noise and individual transmitter and receiver channel conditions must be accurately determined. This paper will identify the satellite link variables of a dynamic multi-frequency time division multiple access (MF-TDMA) system and the impact of these variables on determining the accuracy of the channel estimates | eng_Latn | 5,562 |
Efficient algorithms for sequence detection in non-Gaussian noise with intersymbol interference | Sequence detection is studied for communication channels with intersymbol interference and non-Gaussian noise using a novel adaptive receiver structure. The receiver adapts itself to the noise environment using an algorithm which employs a Gaussian mixture distribution model and the expectation maximization algorithm. Two alternate procedures are studied for sequence detection. These are a procedure based on the Viterbi (1967) algorithm and a symbol-by-symbol detection procedure. The Viterbi algorithm minimizes the probability the sequence is in error and the symbol-by-symbol detector minimizes symbol error rate, which are different. | The problem of decision making under imprecise environments are widely spread in real life decision situations. We present a method of object recognition from imprecise multi observer data, which extends the work of Roy and Maji [J. Compu. Appl. Math. 203(2007) 412-418] to generalized intuitionistic fuzzy soft set theory. The method involves the construction of a comparison table from a generalized intuitionistic fuzzy soft set in a parametric sense for decision making. | eng_Latn | 5,563 |
Vibronic coupling and radiative transitions | Abstract A dynamical treatment of vibration-induced radiative transitions is given by considering the relevant electronic wavefunction to be dependent on both the position and the velocity of the nuclei along some specific (antisymmetrical) vibrational co-ordinate. | In this paper we develop closed-form approximations for the coded BER in bit-interleaved coded modulation (BICM) transmission over Rayleigh fading channels. To obtain the desired expressions we apply the so-called saddle point approximation and use analytical forms of the probability density functions (PDF) of the reliability metrics. Numerical examples illustrate the accuracy of the proposed method. | eng_Latn | 5,564 |
Frequency bandwidth and potential resolution of optical modulators exploiting a multi-phonon light scattering in crystals | We consider physical conditions for realizing the Bragg regime of one-, two-, and three-phonon scattering of light in optically anisotropic crystalline materials. The exact and closed analytical models for describing these regimes are developed and solved. The performed analysis takes into account an opportunity of realizing 100% efficiency of light scattering in these regimes. Possible applications lie in the fields of creating large-aperture modulators of light. In connection with this, the problems of optimizing the frequency bandwidths and potential resolution of such modulators are studied. Reasonable attention is paid to the contribution of acoustic anisotropy to frequency bandwidth. The analytical results are illustrated by computer simulations and compared with proof-of-principle experimental data related to a multi-phonon light scattering in a tellurium dioxide crystal. | This work analyses a multi-user relay network with orthogonal channel access using OFDMA. For the considered Multiple Access Relay Channel (MARC) the relay performs non-adaptive Decode & Forward (DF) with repetition coding. The objective of this paper is to find a resource allocation (subcarrier and power) which maximises the sum rate. Within this context, different algorithms are proposed which are supposed to be near-optimum. The algorithms will be derived and numerical results for their sum rate performance are presented. | eng_Latn | 5,565 |
Dual Hop MIMO OSTBC Communication over Rayleigh-Rician Channel | This paper investigates orthogonal space-time block coded transmission for a multiple-input multiple-output (MIMO) channel with non-coherent amplify-and-forward relaying in a situation where the source-relay and relay-destination channels undergo Rayleigh and Rician fading respectively. Fading coefficients of the Rician channel are independent but not necessarily identically distributed. We derive exact expressions for the moment generating function, first and second moments of the instantaneous signal-to-noise ratio at the destination to statistically characterize the system behavior. We then analyze the system performance by deriving new analytical expressions for the bit error rate and amount of fading. These performance metrics reveal that strong line of sight components between relay-destination link always limit the performance promised by MIMO scattering environment when both nodes have multiple antennas. | timedomainresource allocation withdifferent power allocation methods, e.g., water-filling andequal power Inthis paper, wepresent theadaptive multiuser frequency-allocation. Through simulations we showthat1)system timedomainradioresource allocation modelwhich capacity withthefrequency-time domainresource adaptively allocates theradioresource jointly inthe allocation ismuchmorethanthatwithonlyfrequency frequency andtimedomaintoexploit thefrequencydomain resource allocation; 2)fortheproposed allocation diversity andtimediversity aswellasmultiuser diversity. method theperformance ofwater-filling powerallocation is Thenwegive anin-depth capacity analysis oftheproposed almost thesameasthatoftheequal powerallocation, radioresource allocation withfrequency-time domain especially whenthenumber ofuserislarge. poweradaptation inthedownlink OFDMA systems and drawacomparison with theconventional frequency domain 2.FREQUENCY-TIMEDOMAIN RESOURCE resource allocation method. Simulation results showthat 1) ALLOCATIONMODELS | eng_Latn | 5,566 |
Complexity-reduced MLD based on QR decomposition in OFDM MIMO multiplexing with frequency domain spreading and code multiplexing | Space division multiplexing (SDM) for OFDM systems | A guide to temporal fossa augmentation with small gel particle hyaluronic acid dermal filler. | eng_Latn | 5,567 |
High fidelity mathematical model building with experimental data: A Bayesian approach | Markov Chain Monte Carlo Convergence Diag-nostics: A Comparative Review | Improved indoor VLC MIMO channel capacity using mobile receiver with angular diversity detectors | eng_Latn | 5,568 |
Compressive sensing based channel feedback protocols for spatially-correlated massive antenna arrays | Compressive Sensing | Interference channels | eng_Latn | 5,569 |
Application of Machine Learning for Channel based Message Authentication in Mission Critical Machine Type Communication | Robust frequency and timing synchronization for OFDM | A Very Rapid Prediction of IM Performance Combining Analytical and Finite-Element Analysis | eng_Latn | 5,570 |
Decentralized Group Sparse Beamforming for Multi-Cloud Radio Access Networks | A tutorial on MM algorithms | Subspace-Based Estimation of Time Delays and Doppler Shifts | eng_Latn | 5,571 |
The Generalized Distributive Law | A Recursive Approach to Low Complexity Codes | The Discrete Probability Density Method for Emitter Geolocation | eng_Latn | 5,572 |
OFDM-based automotive joint radar-communication system | A novel approach for embedding communication symbols into physical radar waveforms | Intrapulse Radar-Embedded Communications | eng_Latn | 5,573 |
Structured Prediction of Sequences and Trees using Infinite Contexts | Accurate Unlexicalized Parsing | Chunk-Based Resource Allocation in OFDMA Systems—Part II: Joint Chunk, Power and Bit Allocation | eng_Latn | 5,574 |
MIMO Cooperative Spatial Modulation Systems | Space-Time Block Codes from Orthogonal Designs | BeHop: A Testbed for Dense WiFi Networks | kor_Hang | 5,575 |
Super-Resolution Sparse MIMO-OFDM Channel Estimation Based on Spatial and Temporal Correlations | Spectrum- and Energy-Efficient OFDM Based on Simultaneous Multi-Channel Reconstruction | Applications of machine learning in animal behaviour studies | eng_Latn | 5,576 |
Preamble-based frequency-domain joint CFO and STO estimation for OQAM-based filter bank multicarrier | channel estimation methods for preamble - based ofdm / oqam modulations . | Discriminative Learning and Recognition of Image Set Classes Using Canonical Correlations | eng_Latn | 5,577 |
interference cancellation for cellular systems : a contemporary overview . | near shannon limit error correcting coding and decoding : turbo - codes . | SemEval-2013 Task 11: Word Sense Induction and Disambiguation within an End-User Application | eng_Latn | 5,578 |
BASIC: backbone-assisted successive interference cancellation | An IEEE 802.11a/g/p OFDM receiver for GNU radio | DILAF: A framework for distributed analysis of large-scale system logs for anomaly detection | eng_Latn | 5,579 |
Location Assisted Coding (LAC): Embracing Interference in Free Space Optical Communications | From theory to practice: an overview of MIMO space-time coded wireless systems | Cognitive radio for flexible mobile multimedia communications | eng_Latn | 5,580 |
Maximizing SINR in DL MU-MIMO system on SDP algorithm | A vector-perturbation technique for near-capacity multiantenna multiuser communication-part I: channel inversion and regularization | MoWLD: a robust motion image descriptor for violence detection | kor_Hang | 5,581 |
Low-Complexity Iterative Detection for Large-Scale Multiuser MIMO-OFDM Systems Using Approximate Message Passing | Achieving near-capacity on a multiple-antenna channel | Calpain-mediated cleavage of Atg5 switches autophagy to apoptosis | kor_Hang | 5,582 |
Concatenated coded OFDM system over AWGN channel with H.264 source coding | Efficient Encoding of Low-Density Parity-Check Codes | Tractable nonparametric Bayesian inference in Poisson processes with Gaussian process intensities | eng_Latn | 5,583 |
On path planning methods for automotive collision avoidance | Multi-target threat assessment for automotive applications | A block diagonal jacket matrices for MIMO broadcast channels | eng_Latn | 5,584 |
Self-Interference Cancellation with Nonlinear Distortion Suppression for Full-Duplex Systems | Achieving single channel, full duplex wireless communication | Towards User Personality Profiling from Multiple Social Networks. | eng_Latn | 5,585 |
Low-Complexity Iterative Detection for Large-Scale Multiuser MIMO-OFDM Systems Using Approximate Message Passing | Achieving near-capacity on a multiple-antenna channel | Unsupervised Learning of Invariant Feature Hierarchies with Applications to Object Recognition | kor_Hang | 5,586 |
MIMO Performance of Realistic UE Antennas in LTE Scenarios at 750 MHz | On limits of wireless communications in a fading environment when using multiple antennas | It Is Time to Move Beyond the Linear No-Threshold Theory for Low-Dose Radiation Protection | eng_Latn | 5,587 |
An Artificial Bee Colony Optimization based Channel Estimation Design for MIMO-OFDM Systems | Channel estimation algorithms for OFDM systems | Body Mass Index, Weight Change, and Risk of Prostate Cancer in the Cancer Prevention Study II Nutrition Cohort | eng_Latn | 5,588 |
Beamspace Channel Estimation for Wideband Millimeter-Wave MIMO with Lens Antenna Array | Compressed Channel Sensing: A New Approach to Estimating Sparse Multipath Channels | Comparing the performance of different x86 SIMD instruction sets for a medical imaging application on modern multi- and manycore chips | eng_Latn | 5,589 |
Channel Polarization: A Method for Constructing Capacity-Achieving Codes | Channel combining and splitting for cutoff rate improvement | A mathematical theory of communication: Meaning, information, and topology | eng_Latn | 5,590 |
Blind Massive MIMO Base Stations: Downlink Transmission and Jamming | Multi-Cell MIMO Cooperative Networks: A New Look at Interference | Clustering Affine Subspaces: Hardness and Algorithms | eng_Latn | 5,591 |
A multi user beamforming scheme for downlink MIMO channels based on maximizing signal-to-leakage ratios | matrix computations ( 3 . ed . ) . | From Cloud to Fog Computing: A Review and a Conceptual Live VM Migration Framework | eng_Latn | 5,592 |
NeuroEvolution : The Importance of Transfer Function Evolution and Heterogeneous Networks | Multi-layer feedforward networks are uni-versal approximators | High SNR capacity of millimeter wave MIMO systems with one-bit quantization | eng_Latn | 5,593 |
Non-orthogonal transmission technology in LTE evolution | sparse code multiple access . | OBDA Beyond Relational DBs: A Study for MongoDB | eng_Latn | 5,594 |
Matrix Completion-Based Channel Estimation for MmWave Communication Systems With Array-Inherent Impairments | Low-rank matrix completion using alternating minimization | Adaptive Temporal Encoding Network for Video Instance-level Human Parsing | eng_Latn | 5,595 |
Analog Beamforming in MIMO Communications With Phase Shift Networks and Online Channel Estimation | Analog-to-digital converter survey and analysis | Entropy-Based Algorithms for Best Basis Selection | eng_Latn | 5,596 |
massive mimo : ten myths and one critical question . | Aspects of favorable propagation in Massive MIMO | Corruption perceptions vs. corruption reality | eng_Latn | 5,597 |
Inter-Carrier Interference Estimation in MIMO OFDM Systems with Arbitrary Pilot Structure | An equalization technique for orthogonal frequency-division multiplexing systems in time-variant multipath channels | Spelling Correction as a Foreign Language | eng_Latn | 5,598 |
Survey of Large-Scale MIMO Systems | Distributed Compressive CSIT Estimation and Feedback for FDD Multi-user Massive MIMO Systems | Aphthous ulcers | kor_Hang | 5,599 |
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