Results 191 to 200 of about 5,600 (224)

Iterative nonlinear MMSE multiuser detection

1999 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings. ICASSP99 (Cat. No.99CH36258), 1999
This paper introduces the notion of nonlinear MMSE multiuser detection and shows that MMSE signal estimates followed by single user detectors yield MAP (or minimum probability of error) decisions for CDMA signals. Iterative solutions are proposed for nonlinear MMSE estimation.
Sridhar Gollamudi, Yih-Fang Huang
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Indecomposable error sequences in multiuser detection

IEEE Transactions on Information Theory, 2001
Summary: We provide a graph-based characterization of the set of indecomposable sequences that are useful in the computation of an upper bound to error probability of maximum-likelihood detection in code-division multiple-access multiuser systems. We apply this characterization to a \(K\)-user symmetric system and to a two-user two-rate system.
Wei Luo, Anthony Ephremides
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Constrained minimum-BER multiuser detection

IEEE Transactions on Signal Processing, 1999
A new linear multiuser detector that directly minimizes the bit-error rate (BER) subject to a set of reasonable constraints is proposed. It is shown that the constrained BER cost function has a unique global minimum. This allows us to develop an efficient Newton barrier method for finding the coefficients of the proposed detector using information ...
Xiaofeng Wang, Wu-Sheng Lu, Andreas Antoniou   +2 more
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A constrained optimization approach to multiuser detection

IEEE Transactions on Signal Processing, 1997
Interference cancellation or multiuser detection schemes are of great interest to the CDMA community because of their potential ability to treat the near-far problem and significantly reduce interference levels. A linear adaptive multiuser detection scheme based on constrained optimization is presented, constraints are constructed from knowledge of ...
Jeffrey B. Schodorf, Douglas B. Williams
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Multiuser Detection Based on Grover's Algorithm

2006 IEEE International Symposium on Circuits and Systems, 2006
The classical optimal solution of CDMA multi-user detection is consistent with the optimization of a quadratic function, and to find the optimum is a NP hard problem. Reducing the complexity of optimum based on quantum parallel computation is a new trend of multi-user detection techniques.
Shengmei Zhao, Jia Yao, Baoyu Zheng
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Belief Propagation for Coded Multiuser Detection

2006 IEEE International Symposium on Information Theory, 2006
In this paper a simplified parallel belief propagation (BP) algorithm is suggested as a suboptimal soft-input soft-output multiuser detector in an iterative multiuser decoding scheme. The iterative decoding scheme itself is based on applying an outer BP algorithm for message passing between the BP multiuser detector and the single-user decoders.
Peng Hui Tan, Lars K. Rasmussen
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On Optimal Detectors in Multiuser Detection Problems

Problems of Information Transmission, 2004
This paper is a supplement to [Probl. Inf. Transm. 39, No. 2, 191--206 (2003); translation from Prob. Peredachi Inf. 39, No. 2, 36--52 (2003; Zbl 1077.94006)]. Necessary and sufficient conditions under which asymptotically optimal detectors are linear are given.
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Probability of error in MMSE multiuser detection

IEEE Transactions on Information Theory, 1997
Summary: Performance analysis of the minimum-mean-square-error (MMSE) linear multiuser detector is considered in an environment of nonorthogonal signaling and additive white Gaussian noise. In particular, the behavior of the multiple-access interference (MAI) at the output of the MMSE detector is examined under various asymptotic conditions, including:
Harold Vincent Poor, Sergio Verdú
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Blind widely linear multiuser detection

IEEE Communications Letters, 2000
Widely linear structures for multiuser detection of code division multiple-access signals are proposed, which jointly elaborate the received signal and its complex conjugate. Computer simulations show that the new structures significantly outperform the conventional linear ones, in terms of suppression capability of both wideband multiple-access and ...
GELLI, GIACINTO, PAURA, LUIGI, RAGOZINI A. R. P.   +2 more
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Array processing techniques for multiuser detection

IEEE Transactions on Communications, 1997
Techniques often used in the area of adaptive array signal processing are applied to the multiuser detection problem. The results of this effort include a robust detector, suitable for use in the presence of modeling errors, and a reduced-rank detector with improved transient behavior relative to full-rank detectors.
Jeffrey B. Schodorf, Douglas B. Williams
openaire   +1 more source