Results 161 to 170 of about 832 (201)
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Blind Multiuser Detection Based on Tikhonov Regularization
IEEE Communications Letters, 2011In code-division multiple-access (CDMA) system, ill-conditioning of the covariance matrix of the received signal may degrade the performance of minimum mean-squared error (MMSE) detector, especially when signal-to-noise ratio (SNR) is high and small data sets are available for covariance matrix estimation.
Liwei Zhang
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Adaptive transmitter optimization for blind and group-blind multiuser detection
IEEE Transactions on Signal Processing, 2003The linear subspace-based blind and group-blind multiuser detectors recently developed represent a robust and efficient adaptive multiuser detection technique for code-division multiple-access (CDMA) systems. In this paper, we consider adaptive transmitter optimization strategies for CDMA systems operating in fading multipath environments in which ...
Daryl Reynolds, Xiaodong Wang 0001
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Blind adaptive multiuser detection based on Kalman filtering
IEEE Transactions on Signal Processing, 2002Although several Kalman filtering algorithms have been presented for adaptive multiuser detection, none is "blind" due to requiring training data sequences and/or more knowledge than the spreading waveform and delay of the desired user. This paper proposes a novel blind adaptive multiuser detector based on Kalman filtering and compares it with ...
Xian-Da Zhang
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Asymptotic Analysis of Blind Multiuser Detection with Blind Channel Estimation
IEEE Transactions on Signal Processing, 2004The analytical performance of the subspace-based blind linear minimum mean-square error (MMSE) multiuser detection algorithm in general multipath multi-antenna code-division multiple-access (CDMA) systems is investigated. In blind multiuser detection, the linear MMSE detector of a given user is estimated from the received signals, based on the ...
A Host-Madsen, Xiaodong Wang
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Spatio-temporal blind adaptive multiuser detection
IEEE Transactions on Communications, 2000We propose blind multiuser detection schemes with antenna arrays, which is based on signal subspace estimation. They are a multichannel extension of the decorrelating and minimum mean-square-error detectors, and therefore they share their immunity to near-far effects.
K Abed-Meraim, Yingbo Hua
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Blind equalization and multiuser detection in dispersive CDMA channels
IEEE Transactions on Communications, 1998The 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.
H V Poor
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Blind adaptive multiuser detection
GLOBECOM '05. IEEE Global Telecommunications Conference, 2005., 2005We 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 ...
Shu Wang +7 more
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Blind widely linear multiuser detection
IEEE Communications Letters, 2000Widely 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 +2 more
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Nonlinear group-blind multiuser detection
IEEE Transactions on Communications, 2001Summary: A nonlinear group-blind technique is developed for joint detection of some given users' data in a CDMA uplink environment with the presence of unknown interference. This method performs the so-called ``slowest-descent search'' over a likelihood function of the desired users, starting from the estimate closest to the unconstrained maximizer of ...
Predrag Spasojevic +2 more
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Blind MMSE-Constrained Multiuser Detection
IEEE Transactions on Vehicular Technology, 2008In this paper, blind multiuser detection is studied for a direct-sequence (DS) code-division multiple access (CDMA) system with unknown multipath channels. The receiver is designed to follow a minimum mean-square-error (MMSE) form parameterized by a channel-like constraint vector, which is then optimized by the conventional constant modulus algorithm ...
Ping Liu 0003, Zhengyuan Xu
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