Robust multiuser detection in nongaussian channels signal. Multiuser detection o f alamouti signals chee w ei t an, member, ieee, and a. Pdf we present a framework for analyzing multiuser detectors in the. Then two improved algorithms are proposed, which simplify the detection structure and. Decision feedback multiuser detection electrical, computer. Multiuser detection and statistical mechanics springerlink. 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. Follow 10 views last 30 days sanoop on 16 mar 2012. A timely exploration of multiuser detection in wireless networks. 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.
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. Multiuser detection, in advances in statistical signal process ing. A cdma multiuser detection algorithm on the basis of belief. Vergados, senior member, ieee, and angelos michalas, member, ieee abstract a new detection scheme for multiuser multipleinput multipleoutput mimo systems is analytically presented. We first characterize the signaltointerferenceplusnoise ratio sinr for blind multiuser receivers. Generic multiuser detection and statistical physics. 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. Advances in multiuser detection northwestern university. Optimal multiuser detection is prohibitively complex for a large number of active users. 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. A nonlinear programming approach to cdma multiuser detection aylin yener roy d. This book fills an important need by providing a comprehensive overview of crucial recent developments that have occurred in.
In this thesis, we investigate the impact of mismatch in timedelay estimations between transmitreceive antenna pairs in a multiuser cdma mimo communication system. Multiuser detection, statistical mechanics, codedivision. 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. A motivation for the development presented in this paper can be.
Mmse linear multiuser detection for a dscdma system. Tanaka, analysis of bit error probability of directsequence cdma multiuser demodulators, in advances in neural. Small cells and reuse one typical of nextgen cellular. Suboptimum multiuser detection based on interference can cellation from tentative. Neural network based receiver for multiuser detection in.
Submitted to ieee transactions on wireless communications 1 soft information in interference cancellation based multiuser detection jerome m. We first formulate a robust spacetime decorrelator std by decomposing. In nonlinear detection, estimates of the interference are generated and subtracted out 89. Kiranantawat georgia institute of technology, atlanta, usa. The tabu learning method is used to solve this problem. Large system analysis of blind multiuser detection in cdma. In this paper, general scma detector algorithms based on sumproduct algorithm are elaborated. 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. In the multiuser detection literature, this detector is frequently referred to as the conventional detector. Analysis shows that the use of multiuser detection for randomaccess cdma networks has significant performance gain over the conventional matched filter receiver 17. Multiuser detection in fastfading multipath environments. Geometric interpretation of multiaccess joint detection and the alternating projection algorithm rachel e. In cd orthogonal or semiorthogonal codes are used to modulate. 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.
The proposed detector uses the twodimensional timefrequency rake receiver 1, 3 to combat the. Multiuser detection based on subsymbols is a joint optimization of the codematched. Singleuser channel representation as depicted in fig. 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. A cdma multiuser detection algorithm on the basis of. Lower complexity solutions can be provided by iterative or. Generic multiuser detection and statistical physics, in advances in multiuser.
In this paper, we consider the mai mitigation problem in dscdma channels with nongaussian ambient noise. Blind multiuser detection article pdf available in ieee transactions on information theory 414. The original optimum multiuser detection problem omud is a 0 1 quadratic program for which there exists no efficient algorithm. Performance of linear multiuser detection in gaussian and. It can achieve nearoptimal performance and outperform the conventional detector and the multiuser detector based on the hopfield neural network. Training sequence matched filter multiuser detection signature waveform. T1 generic multiuser detection and statistical physics.
Multiuser detection how is multiuser detection abbreviated. We describe a general framework, which iterates between linear multiuser. A framework for analyzing multiuser detectors in the context of statistical mechanics is presented. Multiuser detectiondecoding in asynchronous multitone multiple access systems andrea m. Pdf we analyze multiuser detection under the assumption that the number of. Pdf multiuser detection and statistical mechanics researchgate.
Lattice reduction based mimo detection and its application. Shahin alam on 26 apr 2017 can any one help me to create matlab code for ds cdma multiuser detection. During the past decade, the design and development of current and emerging wireless systems have motivated many important advances in multiuser detection. 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. 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. A nonlinear programming approach to cdma multiuser. Yen, major professor this dissertation introduces three novel multiuser detection approaches in. Soft information in interference cancellation based multiuser detection jerome m. Published 15 october 2003 2003 iop publishing ltd journal of physics a.
Tabu learning method for multiuser detection in cdma. However, the computational complexity of ml detection is quite high, and therefore, effective nearoptimal multiuser detection techniques in nongaussian noise are needed. It has been reported that the lr based mimo detection can achieve a full receive diversity. 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.
The channel representation serves as the backbone of the multiuser detection framework developed in this paper. Soft information in interference cancellation based multiuser. Multiuser detection mud, on the other hand, attempts to utilize the structure of interference to mitigate the adverse effect of mai 21. Kw interference cancellation and conventional parallel interference. Multiuser detection provides the first comprehensive treatment of the subject of multiuser digital communications. Shapiro, member, ieee, and james dunyak, member, ieee, abstractthis paper considers soft information in interference cancellation based multiuser detection algorithms. Mmse linear multiuser detection for a dscdma system ece 6604 personal and mobile communications prof. Gaussian processes for multiuser detection in cdma receivers. A motivation for the development presented in this paper can be obtained by glancing over fig. Optimum detection theory the single user matched filter is the optimum detector, if the detector only knows y1.
The overview of a cellular mobile network with a cluster size of 4 1. Performance enhancement of downlink multiuser dscdma detectors in multipath channels over awgn channels. Multiuser detection in cdma mimo systems with timing. Multiuser detection mitigates interference through joint or successive detection area spectral e. Verdu multiuser detection, advances in detection and estimation, jai press. Multiuser detection in multibeam satellite systems arxiv. Shapiro, member, ieee, and james dunyak, member, ieee, abstractthis paper considers soft information in inter ference cancellation based multiuser detection algorithms. In section 2 the multiuser cdma is introduced, and known and new largesystem results are presented. This paper proposes a novel adaptive mud algorithm for a wide variety practically any kind of interference limited systems, for.
In section 3 we relate multiuser detection to spin glass in statistical mechanics. Section 4 carries a detailed analysis of linear multiuser detectors. This approach has been applied to mimo detection by yao in 2002. This book fills an important need by providing a comprehensive overview of crucial recent developments that have occurred in this active research area.
Advances in multiuser detection wiley online books. Multiuser detection is an approach which uses both these filters for the optimization. Robert calderbank, fellow, ieee abstract in a mimo mul tipleaccess channel wh ere users. Advances in neural information processing systems t. In this paper, a support vector machine svm multiuser receiver based on competition learning cl strategy is proposed. In this paper we propose a new linear multiuser detector, which we refer to as the orthogonal multiuser omu detector. 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. A cdma multiuser detection algorithm on the basis of belief propagation. Multiuser detection in multiple input multiple output. 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. Traditionally, multiuser detectorsa codematched and a multiuser linear. Robust multiuser detection in nongaussian channels. For the case of binary phaseshift keying bpsk modulation, a.
However, the main drawback of the optimal multiuser detection is one. Sayeed, member, ieee, andrew sendonaris, student member, ieee, and behnaam aazhang, senior member, ieee abstract we propose a new framework for multiuser detec. Mneney centre for radio access technologies, school of electrical, electronic and computer engineering, university of kwazulunatal, king george v. Jointly optimum, synchronous channel twouser synchronous channel. A nonlinear programming approach to cdma multiuser 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. 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. Bandwidth sharing in multiuser systems cd and sd codedivision cd. Interference cancellation and complexity reduction in multi. Interference cancellation and complexity reduction in. Results for the optimal detectors are obtained in section 5.
Lattice reduction based detection lattice reduction lr can be used to decode lattice coded signals. Soft information in interference cancellation based. Adaptive nearoptimal multiuser detection using a stochastic and hysteretic hopfield net receiver. Trafficaided multiuser detection for randomaccess cdma. Theoptimum receiver knows all used waveforms, timings and amplitudes of all users and the noise level. Multiuser detectiondecoding in asynchronous multitone. Variance transfer methods are used for convergence analysis. Jan 02, 2003 adaptive nearoptimal multiuser detection using a stochastic and hysteretic hopfield net receiver. Kw generic multiuser detection and statistical physics. 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. A universal interpretation of multiuser detection relates the multiuser efficiency to. Lucent technologies 67 whippany rd whippany nj 07981 email.
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