Results 131 to 140 of about 215 (157)

The cross-entropy method for blind multiuser detection

International Symposium onInformation Theory, 2004. ISIT 2004. Proceedings., 2004
We consider the problem of blind multiuser detection. We adopt a Bayesian approach where unknown parameters are considered random and integrated out. Computing the maximum a posteriori estimate of the input data sequence requires solving a combinatorial optimization problem.
Zaifei Liu, Arnaud Doucet, Sumeetpal S. Singh   +2 more
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Blind Multiuser Detection for Ultra Wideband System

2009 Third International Conference on Genetic and Evolutionary Computing, 2009
Based on the CMA, a proved blind multiuser detection, which combined with the multistage wiener filter(MSWF) for UWB systems in a realistic indoor channel is proposed in this paper. This new algorithm had a low computational complexity without the computation of matrix inverse.
Zhengqiang Wang, Ling-yuan Li, Lixin Song   +2 more
openaire   +1 more source

Blind Multiuser Detection: FromMOE to Subspace Methods

IEEE Transactions on Signal Processing, 2004
The minimum output energy (MOE) multiuser receiver has been shown to approach the minimum mean-square-error (MMSE) receiver at high signal-to-noise ratio (SNR). However, performance degradation is incurred by noise induced channel estimation error. In this paper, we propose a Power of R (POR) technique to significantly improve the performance of the ...
Zhengyuan Xu, Ping Liu 0003, Xiaodong Wang 0001   +2 more
openaire   +1 more source

Maximum likelihood blind multiuser detection

Proceedings of the IEEE Signal Processing Workshop on Higher-Order Statistics. SPW-HOS '99, 2003
Code division multiple access (CDMA) is the most promising candidate to implement the wireless multiple access scheme of third-generation mobile communication systems. This paper introduces a new blind approach to multiuser detection in time-dispersive channels.
J. Miguez, L. Castedo
openaire   +1 more source

Implementing ICA in blind multiuser detection

IEEE International Symposium on Communications and Information Technology, 2004. ISCIT 2004., 2005
This paper introduces a blind multiuser detection algorithm for MIMO channels. The receiver is required to separate and recover the information signal of the desired user(s) based on independent component analysis (ICA) of the received sequence. The received sequence is assumed to be independent identically distributed.
Leong, W. Y., Homer, J. P.
openaire   +2 more sources

Blind Multiuser Detection Based on Kernel Approximation

2006
A kernel based multiuser detection (MUD) scheme in code-division multiple-access (CDMA) system is proposed. In this scheme, the support vector (SV) under support vector (SVM) framework is obtained through a kernel sparsity approximation, which regulates the kernel width parameter via a heuristic approach to obtain an approximate equivalent SV.
Tao Yang 0008, Bo Hu 0002
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Blind adaptive noncoherent multiuser detection for nonlinear modulation

IEEE Transactions on Communications, 2000
Noncoherent multiuser detection for nonlinear modulation was previously studied and the idea of phase-independent noncoherent decorrelation was introduced and three post-decorrelative detectors were obtained and analyzed. However, their implementation requires the knowledge of the signature waveforms of all the users, which may be available only for ...
Deepak Das, Mahesh K. Varanasi
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Blind multiuser detection based on linear constrained MMSE

2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03)., 2004
Based on the minimum mean-square error (MMSE) criterion, a new blind multiuser detector is proposed. The searching space for the optimal detector is constrained according to the spreading code and channel properties of the desired user. The proposed constraint technique can guarantee that the optimal detector associated with the desired user locates in
Shangkun Xiong, Fangjiong Chen, Gang Wei
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Blind equalization and multiuser detection in dispersive CDMA channels

IEEE Transactions on Communications, 1998
The problem of blind demodulation of multiuser information symbols in a high-rate code-division multiple-access (CDMA) network in the presence of both multiple-access interference (MAI) and intersymbol interference (ISI) is considered. The dispersive CDMA channel is first cast into a multiple-input multiple-output (MIMO) signal model framework.
Xiaodong Wang 0001, H. Vincent Poor
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Semi-blind decorrelating multiuser detection for synchronous CDMA

2003 IEEE Wireless Communications and Networking, 2003. WCNC 2003., 2004
Multiuser detection is a key technology for combating multiple access interference (MAI) in CDMA systems. In this paper, we propose three effective one-shot multiuser semi-blind decorrelating detectors based on least squares (LS), total least squares (TLS) and mixed LS/TLS (MLS) formulations.
Shu Wang, James Caffery Jr., Hanhong Shen   +2 more
openaire   +1 more source