However, the main drawback of the optimal multiuser detection is one. Advances in multiuser detection northwestern university. A nonlinear programming approach to cdma multiuser. A motivation for the development presented in this paper can be. Multiuser detection o f alamouti signals chee w ei t an, member, ieee, and a. Training sequence matched filter multiuser detection signature waveform. 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 cdma multiuser detection algorithm on the basis of. In this paper we propose a new linear multiuser detector, which we refer to as the orthogonal multiuser omu detector.
Lattice reduction based detection lattice reduction lr can be used to decode lattice coded signals. Gaussian processes for multiuser detection in cdma receivers. Jointly optimum, synchronous channel twouser synchronous channel. 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. Multiuser detection, in advances in statistical signal process ing. Lower complexity solutions can be provided by iterative or. Robust multiuser detection in nongaussian channels signal. The tabu learning method is used to solve this problem. Trafficaided multiuser detection for randomaccess cdma.
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. In section 2 the multiuser cdma is introduced, and known and new largesystem results are presented. Advances in neural information processing systems t. Interference cancellation and complexity reduction in multi. Multiuser detection, statistical mechanics, codedivision. Generic multiuser detection and statistical physics. Mmse linear multiuser detection for a dscdma system. We first characterize the signaltointerferenceplusnoise ratio sinr for blind multiuser receivers. Multiuser detection in multibeam satellite systems arxiv. We describe a general framework, which iterates between linear multiuser.
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. Multiuser detectiondecoding in asynchronous multitone multiple access systems andrea m. This approach has been applied to mimo detection by yao in 2002. In this paper, we consider the mai mitigation problem in dscdma channels with nongaussian ambient noise. In nonlinear detection, estimates of the interference are generated and subtracted out 89. Vergados, senior member, ieee, and angelos michalas, member, ieee abstract a new detection scheme for multiuser multipleinput multipleoutput mimo systems is analytically presented. Multiuser detection mitigates interference through joint or successive detection area spectral e. The proposed detector uses the twodimensional timefrequency rake receiver 1, 3 to combat the. Verdu multiuser detection, advances in detection and estimation, jai press. 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. Singleuser channel representation as depicted in fig. Kw interference cancellation and conventional parallel interference. 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.
In this paper, general scma detector algorithms based on sumproduct algorithm are elaborated. Geometric interpretation of multiaccess joint detection and the alternating projection algorithm rachel e. Mneney centre for radio access technologies, school of electrical, electronic and computer engineering, university of kwazulunatal, king george v. The channel representation serves as the backbone of the multiuser detection framework developed in this paper. The original optimum multiuser detection problem omud is a 0 1 quadratic program for which there exists no efficient algorithm. Kiranantawat georgia institute of technology, atlanta, usa. Large system analysis of blind multiuser detection in cdma. Multiuser detection how is multiuser detection abbreviated. Multiuser detection is an approach which uses both these filters for the optimization. Lucent technologies 67 whippany rd whippany nj 07981 email.
Yen, major professor this dissertation introduces three novel multiuser detection approaches in. Multiuser detection and statistical mechanics springerlink. Performance of linear multiuser detection in gaussian and non. In this thesis, we investigate the impact of mismatch in timedelay estimations between transmitreceive antenna pairs in a multiuser cdma mimo communication system. Small cells and reuse one typical of nextgen cellular. 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. Shapiro, member, ieee, and james dunyak, member, ieee, abstractthis paper considers soft information in interference 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. A graphical representation of the multiuser communication problem. Submitted to ieee transactions on wireless communications 1 soft information in interference cancellation based multiuser detection jerome m. During the past decade, the design and development of current and emerging wireless systems have motivated many important advances in multiuser detection. 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. It is also being currently investigated for demodulation in lowpower interchip and intrachip communication. Generic multiuser detection and statistical physics, in advances in multiuser. We first formulate a robust spacetime decorrelator std by decomposing. In cd orthogonal or semiorthogonal codes are used to modulate.
Kw generic multiuser detection and statistical physics. 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. Pdf largesystem analysis of multiuser detection with an. Lattice reduction based mimo detection and its application. A cdma multiuser detection algorithm on the basis of belief. This book fills an important need by providing a comprehensive overview of crucial recent developments that have occurred in this active research area. Traditionally, multiuser detectorsa codematched and a multiuser linear. 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. Multiuser detection based on subsymbols is a joint optimization of the codematched. In the multiuser detection literature, this detector is frequently referred to as the conventional detector. It can achieve nearoptimal performance and outperform the conventional detector and the multiuser detector based on the hopfield neural network. Multiuser detection in cdma mimo systems with timing. Results for the optimal detectors are obtained in section 5. Shapiro, member, ieee, and james dunyak, member, ieee, abstractthis paper considers soft information in inter ference cancellation based multiuser detection algorithms.
Published 15 october 2003 2003 iop publishing ltd journal of physics a. Theoptimum receiver knows all used waveforms, timings and amplitudes of all users and the noise level. Interference cancellation and complexity reduction in. Tabu learning method for multiuser detection in cdma. It has been reported that the lr based mimo detection can achieve a full receive diversity. Multiuser detectiondecoding in asynchronous multitone.
Optimal multiuser detection is prohibitively complex for a large number of active users. In this paper, a support vector machine svm multiuser receiver based on competition learning cl strategy is proposed. Variance transfer methods are used for convergence analysis. For the case of binary phaseshift keying bpsk modulation, a. Pdf we present a framework for analyzing multiuser detectors in the. Multiuser detection in fastfading multipath environments. Neural network based receiver for multiuser detection in. T1 generic multiuser detection and statistical physics. Performance enhancement of downlink multiuser dscdma detectors in multipath channels over awgn channels. A new multiuser detection approach with different priorities nikolaos i. Uplink multiuser mimo detection scheme with reduced.
A motivation for the development presented in this paper can be obtained by glancing over fig. 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. Optimum detection theory the single user matched filter is the optimum detector, if the detector only knows y1. Multiuser detection in multiple input multiple output. 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 nonlinear programming approach to cdma multiuser detection aylin yener roy d. Pdf we analyze multiuser detection under the assumption that the number of. 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. Soft information in interference cancellation based. Then two improved algorithms are proposed, which simplify the detection structure and. Tanaka, analysis of bit error probability of directsequence cdma multiuser demodulators, in advances in neural. Robert calderbank, fellow, ieee abstract in a mimo mul tipleaccess channel wh ere users.
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 nonlinear programming approach to cdma multiuser detection. Advances in multiuser detection wiley online books. A timely exploration of multiuser detection in wireless networks. Multiuser detection mud, on the other hand, attempts to utilize the structure of interference to mitigate the adverse effect of mai 21. Decision feedback multiuser detection electrical, computer. Soft information in interference cancellation based multiuser. This paper proposes a novel adaptive mud algorithm for a wide variety practically any kind of interference limited systems, for. Bandwidth sharing in multiuser systems cd and sd codedivision cd. This book fills an important need by providing a comprehensive overview of crucial recent developments that have occurred in. However, the computational complexity of ml detection is quite high, and therefore, effective nearoptimal multiuser detection techniques in nongaussian noise are needed. Adaptive nearoptimal multiuser detection using a stochastic and hysteretic hopfield net receiver. Blind multiuser detection article pdf available in ieee transactions on information theory 414.
Performance of linear multiuser detection in gaussian and. Shahin alam on 26 apr 2017 can any one help me to create matlab code for ds cdma multiuser detection. The overview of a cellular mobile network with a cluster size of 4 1. Suboptimum multiuser detection based on interference can cellation from tentative. In section 3 we relate multiuser detection to spin glass in statistical mechanics. Sayeed, member, ieee, andrew sendonaris, student member, ieee, and behnaam aazhang, senior member, ieee abstract we propose a new framework for multiuser detec. Advances in neural information processing systems, nips, volume 8. Pdf multiuser detection and statistical mechanics researchgate. 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. Simulation results have shown that the method presented in this paper tld is an efficient method for multiuser detection in cdma systems. Jan 02, 2003 adaptive nearoptimal multiuser detection using a stochastic and hysteretic hopfield net receiver. A framework for analyzing multiuser detectors in the context of statistical mechanics is presented. Section 4 carries a detailed analysis of linear multiuser detectors.
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