Shapiro, member, ieee, and james dunyak, member, ieee, abstractthis paper considers soft information in interference cancellation based multiuser detection algorithms. A cdma multiuser detection algorithm on the basis of belief propagation. We describe a general framework, which iterates between linear multiuser. Advances in neural information processing systems t. Jointly optimum, synchronous channel twouser synchronous channel. The matched filter in the cdma channel this section is concerned with the analysis of the capabilities and performance of multiuser detection using the simplest detector.
Robust multiuser detection in nongaussian channels. Soft information in interference cancellation based multiuser detection jerome m. Multiuser detection based on subsymbols is a joint optimization of the codematched. Multiuser detection and statistical mechanics springerlink. Generic multiuser detection and statistical physics. Interference cancellation and complexity reduction in multi. Tabu learning method for multiuser detection in cdma.
Multiuser detection in multibeam satellite systems arxiv. Information, estimation and multiuser detection dongning guo a dissertation presented to the faculty of princeton university in candidacy for the degree of doctor of philosophy recommended for acceptance by the department of electrical engineering november, 2004. Tanaka, analysis of bit error probability of directsequence cdma multiuser demodulators, in advances in neural. Multiuser detection mitigates interference through joint or successive detection area spectral e.
A nonlinear programming approach to cdma multiuser. Follow 10 views last 30 days sanoop on 16 mar 2012. Multiuser detection, statistical mechanics, codedivision. Kw interference cancellation and conventional parallel interference. Geometric interpretation of multiaccess joint detection and the alternating projection algorithm rachel e. A timely exploration of multiuser detection in wireless networks. In linear multiuser detection, a linear mapping transformation is applied to the soft outputs of the conventional detector to produce a new set of outputs, which hopefully provide better performance.
Pdf multiuser detection and statistical mechanics researchgate. Advances in multiuser detection northwestern university. Multiuser detection, in advances in statistical signal process ing. Multiuser detectiondecoding in asynchronous multitone multiple access systems andrea m. This paper proposes a novel adaptive mud algorithm for a wide variety practically any kind of interference limited systems, for example, code division multiple access cdma.
Training sequence matched filter multiuser detection signature waveform. Gaussian processes for multiuser detection in cdma receivers. We first formulate a robust spacetime decorrelator std by decomposing. Kiranantawat georgia institute of technology, atlanta, usa. Performance of linear multiuser detection in gaussian and. For the case of binary phaseshift keying bpsk modulation, a. In section 3 we relate multiuser detection to spin glass in statistical mechanics. Blind multiuser detection article pdf available in ieee transactions on information theory 414. The omu detector tries to mitigate both the effect of the mai and the white noise, by optimally whitening 5, 4 the noise component in the output of the decorrelator prior to detection. The new algorithm adopts a heuristic approach to extend standard svm algorithm for multiuser classification problem, and also a clustering analysis is applied to reduce the total amount of computation. Optimum detection theory the single user matched filter is the optimum detector, if the detector only knows y1.
Lower complexity solutions can be provided by iterative or. In section 2 the multiuser cdma is introduced, and known and new largesystem results are presented. Section 4 carries a detailed analysis of linear multiuser detectors. Then two improved algorithms are proposed, which simplify the detection structure and. Suboptimum multiuser detection based on interference can cellation from tentative. Lucent technologies 67 whippany rd whippany nj 07981 email. Advances in multiuser detection wiley online books. Multiuser detection o f alamouti signals chee w ei t an, member, ieee, and a. Interference cancellation and complexity reduction in.
Large system analysis of blind multiuser detection in cdma. Bandwidth sharing in multiuser systems cd and sd codedivision cd. Uplink multiuser mimo detection scheme with reduced. Willsky laboratory for information and decision systems massachusetts institute of technology december 20, 1994 this paper, with the exception of section 8 examples, appears in icassp.
This book fills an important need by providing a comprehensive overview of crucial recent developments that have occurred in. Jan 02, 2003 adaptive nearoptimal multiuser detection using a stochastic and hysteretic hopfield net receiver. Verdu multiuser detection, advances in detection and estimation, jai press. This paper proposes a novel adaptive mud algorithm for a wide variety practically any kind of interference limited systems, for. A new multiuser detection approach with different priorities nikolaos i. Yen, major professor this dissertation introduces three novel multiuser detection approaches in. Lattice reduction based detection lattice reduction lr can be used to decode lattice coded signals. Multiuser detection is an approach which uses both these filters for the optimization. Performance of linear multiuser detection in gaussian and non. Multiuser detectiondecoding in asynchronous multitone. Pdf largesystem analysis of multiuser detection with an. Simulation results have shown that the method presented in this paper tld is an efficient method for multiuser detection in cdma systems.
Multiuser detection in multple input multple output orthogonal frequency division multiplexing systems by blind signal separation techniques by yu du florida international university, 2012 miami, florida professor kang k. Advances in neural information processing systems, nips, volume 8. Pdf we analyze multiuser detection under the assumption that the number of. In the multiuser detection literature, this detector is frequently referred to as the conventional detector. Optimal multiuser detection is prohibitively complex for a large number of active users. As we know, two previous works on multiuser detection schemes proposed by 9 and 14 will generate great amounts of candidate matrices as the number of the active users increases. Variance transfer methods are used for convergence analysis. A nonlinear programming approach to cdma multiuser detection. This approach has been applied to mimo detection by yao in 2002. In this paper we propose a new linear multiuser detector, which we refer to as the orthogonal multiuser omu detector.
A motivation for the development presented in this paper can be. Soft information in interference cancellation based. The tabu learning method is used to solve this problem. Multiuser detection in multiple input multiple output. In cd orthogonal or semiorthogonal codes are used to modulate. Multiuser detection deals with demodulation of the mutually interfering digital streams of information that occur in areas such as wireless communications, highspeed data transmission, satellite communication, digital television, and magnetic recording. A graphical representation of the multiuser communication problem. A cdma multiuser detection algorithm on the basis of. It has been reported that the lr based mimo detection can achieve a full receive diversity. Trafficaided multiuser detection for randomaccess cdma. Multiuser detection mud, on the other hand, attempts to utilize the structure of interference to mitigate the adverse effect of mai 21.
A motivation for the development presented in this paper can be obtained by glancing over fig. Sayeed, member, ieee, andrew sendonaris, student member, ieee, and behnaam aazhang, senior member, ieee abstract we propose a new framework for multiuser detec. Decision feedback multiuser detection electrical, computer. Shapiro, member, ieee, and james dunyak, member, ieee, abstractthis paper considers soft information in inter ference cancellation based multiuser detection algorithms. Mneney centre for radio access technologies, school of electrical, electronic and computer engineering, university of kwazulunatal, king george v avenue, durban, kwazulunatal, 4001, south africa. Robust multiuser detection in nongaussian channels signal. Mneney centre for radio access technologies, school of electrical, electronic and computer engineering, university of kwazulunatal, king george v. We first characterize the signaltointerferenceplusnoise ratio sinr for blind multiuser receivers. The original optimum multiuser detection problem omud is a 0 1 quadratic program for which there exists no efficient algorithm. This book fills an important need by providing a comprehensive overview of crucial recent developments that have occurred in this active research area.
Published 15 october 2003 2003 iop publishing ltd journal of physics a. Performance enhancement of downlink multiuser dscdma detectors in multipath channels over awgn channels. It can achieve nearoptimal performance and outperform the conventional detector and the multiuser detector based on the hopfield neural network. In this paper, general scma detector algorithms based on sumproduct algorithm are elaborated. T1 generic multiuser detection and statistical physics. In this thesis, we investigate the impact of mismatch in timedelay estimations between transmitreceive antenna pairs in a multiuser cdma mimo communication system. During the past decade, the design and development of current and emerging wireless systems have motivated many important advances in multiuser detection.
The overview of a cellular mobile network with a cluster size of 4 1. The general approach in the presence of such hardship is to approximate the solution by working on an easier problem that can be solved effi. Results for the optimal detectors are obtained in section 5. Pdf we present a framework for analyzing multiuser detectors in the. The proposed detector uses the twodimensional timefrequency rake receiver 1, 3 to combat the. Submitted to ieee transactions on wireless communications 1 soft information in interference cancellation based multiuser detection jerome m. Multiuser detection in cdma mimo systems with timing. Park, uplink multiuser mimo detection scheme with reduced computational complexity 1 1 1 1 2 1 1 hhh s h h s e e rxhsxhs xh h x 6 and the interference plus noise correlation matrix rin is expressed as 00 22 00 2 2 2 2 22 kkh hkkh hkkh in kk k hk kk khhh k k hk kh ss m k e ee ee.
Analysis shows that the use of multiuser detection for randomaccess cdma networks has significant performance gain over the conventional matched filter receiver 17. Lattice reduction based mimo detection and its application. Theoptimum receiver knows all used waveforms, timings and amplitudes of all users and the noise level. A cdma multiuser detection algorithm on the basis of belief. Mmse linear multiuser detection for a dscdma system. Multiuser detection deals with demodulation of the mutually interfering digital streams of information that occur in areas such as wireless communications, highspeed data transmission, dsl, satellite communication, digital television, and magnetic recording. Robert calderbank, fellow, ieee abstract in a mimo mul tipleaccess channel wh ere users. Neural network based receiver for multiuser detection in. In nonlinear detection, estimates of the interference are generated and subtracted out 89.
Multiuser detection how is multiuser detection abbreviated. In this paper, we consider the mai mitigation problem in dscdma channels with nongaussian ambient noise. Multiuser detection in fastfading multipath environments. Our results reveal that the sir of these blind receivers saturates when the power of the desired user increases, which is in stark contrast to the fact that the sir achieved by the exact mmse receiver can get arbitrarily large. Generic multiuser detection and statistical physics, in advances in multiuser. Vergados, senior member, ieee, and angelos michalas, member, ieee abstract a new detection scheme for multiuser multipleinput multipleoutput mimo systems is analytically presented. A framework for analyzing multiuser detectors in the context of statistical mechanics is presented. Soft information in interference cancellation based multiuser.
The channel representation serves as the backbone of the multiuser detection framework developed in this paper. A cdma multiuser detection algorithm on the basis of belief propagation yoshiyuki kabashima department of computational intelligence and systems science, tokyo institute of technology, yo kohama 2268502, japan email. A nonlinear programming approach to cdma multiuser detection aylin yener roy d. Small cells and reuse one typical of nextgen cellular. Kw generic multiuser detection and statistical physics.
Mmse linear multiuser detection for a dscdma system ece 6604 personal and mobile communications prof. A universal interpretation of multiuser detection relates the multiuser efficiency to. Multiuser detection provides the first comprehensive treatment of the subject of multiuser digital communications. Singleuser channel representation as depicted in fig.
However, the main drawback of the optimal multiuser detection is one. It is also being currently investigated for demodulation in lowpower interchip and intrachip communication. Shahin alam on 26 apr 2017 can any one help me to create matlab code for ds cdma multiuser detection. Adaptive nearoptimal multiuser detection using a stochastic and hysteretic hopfield net receiver. In this paper, a support vector machine svm multiuser receiver based on competition learning cl strategy is proposed. Traditionally, multiuser detectorsa codematched and a multiuser linear.
129 81 1259 1101 692 822 317 194 270 456 281 884 1057 1286 1226 450 1223 1021 365 1408 519 1032 429 410 44 912 1035 780 1172