Results 131 to 140 of about 1,386 (158)

Blind adaptive multiuser detection

GLOBECOM '05. IEEE Global Telecommunications Conference, 2005., 2005
We propose a new blind multiuser signal model and detection framework for solving the near-far problem in synchronous CDMA in this paper. Compared with existing blind detectors, the proposed framework requires a minimum number of previously received signals, which is about the number of interfering users, and no sub-space separation or sequence ...
null Shu Wang, S.G. Kim, null Li-Hsiang Sun, H. Kim, S.W. Lee, S.R. Subramanya, K.Y. Kim, B.K. Yi   +7 more
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Blind adaptive multiuser detection

IEEE Transactions on Information Theory, 1995
This paper introduces an adaptive multiuser detector which converges (for any initialization) to the minimum mean-square error detector without requiring training sequences. This blind multiuser detector requires no more knowledge than does the conventional single-user receiver: the desired user's signature waveform and its timing.
Honig, Michael, Madhow, Upamanyu, Verdú, Sergio   +2 more
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Iterative multiuser detection

IEEE Signal Processing Magazine, 2004
Communication channels that involve both error-control coding and multiple-access signaling are of increasing interest in applications such as cellular telephony, wireless computer networks, and broadband local access. Optimal data detection and decoding in such channels generally require a level of computational complexity that is prohibitive for ...
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Modified MMSE multiuser detection

The 8th International Conference on Communication Systems, 2002. ICCS 2002., 2003
A modified MMSE multiuser detection structure is proposed, which jointly elaborate the received signal and its complex conjugate. Simulation results show that the new structures significantly outperform the conventional MMSE structure, in terms of suppression capability of both multiple-access interference and narrowband interference.
null Cai Guoquan, null Yu Dapeng, null Song Wentso   +2 more
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Turbo greedy multiuser detection

IEEE Journal on Selected Areas in Communications, 2001
Previously, a novel scheme for iterative multiuser detection and turbo decoding was proposed by Damnjanovic and Vojcic (2000, 2001). In this scheme, multiuser detection and single-user turbo decoding are tightly coupled to maximize the overall gain.
A.A. AlRustamani, A.D. Damnjanovic, B.R. Vojcic   +2 more
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Partially adaptive multiuser detection

Proceedings of Vehicular Technology Conference - VTC, 2002
The problem of reducing the complexity of a blind adaptive multiuser detector is addressed. The original detector is based on constrained optimization where the constraint is constructed from knowledge of the desired user's code and timing. Since the number of adaptive weights in the constrained optimization detector is proportional to the code length,
J.B. Schodorf, D.B. Williams
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Asymptotic multiuser efficiency for decision-feedback multiuser detection

Proceedings of ICC/SUPERCOMM '96 - International Conference on Communications, 2002
In this work, arbitrarily tight upper and lower bounds to the asymptotic multiuser efficiency (AME) are derived for K asynchronous users and decision-feedback multiuser detection. Because the multiple-access interference is noncausal, the precursor interference may be canceled out by making tentative decisions via conventional or decorrelated decisions,
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Blind multiuser detection via interference identification

IEEE Transactions on Communications, 2002
Previous results on blind multiuser detection apply in situations where the signal parameters of the users of interest are known, and those of the interferers; are unknown. In this paper, we consider the new paradigm of an N-user system, in which K users are active, and the problem is to detect G users of interest out of those K active users when the ...
RICCI, Giuseppe, VARANASI M. K, DE MAIO A.   +2 more
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Turbo-based multiuser detection

Proceedings of IEEE International Symposium on Information Theory, 2002
This paper describes the application of cross-entropy minimization techniques to coded multiuser detection. Research has shown that the complexity of the optimum multiuser detector is exponential in the number of users but that it offers much superior performance over the conventional detector that ignores multiple access interference (MAI).
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Self-organizing multiuser detection

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94), 2002
The conventional DS/CDMA receiver utilizes a code matched filter followed by a sign decision. In a multiuser environment this approach is suboptimal and it does not lead to a near-far resistant (NFR) receiver. A NFR receiver, optimum or suboptimum, utilizes the multivariate statistics provided by the bank of matched filters in order to make a decision ...
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