Results 161 to 170 of about 3,134,060 (181)

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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Learning algorithms for blind multiuser detection in CDMA downlink

Ninth IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (Cat. No.98TH8361), 2002
CDMA (code division multiple access) is a multiple access technique based on spread spectrum methods. In a downlink signal processing, only the code of the mobile phone user is known, while the codes of the interfering users are unknown. Blind source separation or multiuser detection is an approach offering the solution to this problem.
Jyrki Joutsensalo, Tapani Ristaniemi
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A novel nonlinear group-blind multiuser detection technique

2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03)., 2004
Bayesian detection for asynchronous DS-CDMA systems with unknown interference and multipath fading is studied. A novel nonlinear group-blind multiuser detector is proposed, in which a Gibbs sampler is employed to perform the Bayesian multiuser detection according to the linear group-blind decorrelator output.
Lili Wu, Guisheng Liao, Hui Huang
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Blind multiuser detection for MC-CDMA with antenna array

Computers & Electrical Engineering, 2010
We investigate the characteristics of the received signal as trilinear model for multi-carrier code division multiple access (MC-CDMA) system with antenna array, and propose a blind multiuser detection method for MC-CDMA system in this paper. The trilinear-based multiuser detection algorithm (Trilinear-MUDE) that we presented exploits the versatile ...
Xiaofei Zhang 0001, Gaopeng Feng, Xin Gao, Dazhuan Xu   +3 more
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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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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
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Averaging blind sign algorithms for adaptive multiuser detection

2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221), 2002
This paper illustrates the use of "averaging" to improve the convergence rate of adaptive sign regressor and sign error multiuser detectors. The ingenious concept of averaging was invented by Polyak (1990) - this paper analyses the performance of averaging in the sign error and sign regressor adaptive blind multiuser detection algorithms in DS/CDMA ...
Gang George Yin, Vikram Krishnamurthy
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Blind multiuser detection for CDMA with multipath: a direct method

2000 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.00CH37100), 2002
In this paper we consider the blind multiuser detection problem for asynchronous DS-CDMA systems operating in a multipath environment. Using only the spreading code of the desired user, we first estimate the column vector subspace of the channel matrix by multiple linear prediction.
Xiaohua Li 0003, H. Howard Fan
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Robust blind multiuser detection for synchronous CDMA systems

2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03)., 2004
The performance of blind multiuser detection methods is known to degrade in the presence of mismatches between the actual and the presumed desired user signatures. Such mismatches may occur in practical situations due to an imperfect knowledge of the channel impulse response. We propose a new robust approach to blind multiuser detection in the presence
Alex B. Gershman, Shahram Shahbazpanahi
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Blind multiuser detection algorithms based on set theory

12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598), 2002
This paper proposes three blind multiuser detection algorithms based on set theory. They all originate from the set-membership filter (SMF). Our algorithms have some advantages over traditional adaptive algorithms. First, They provide region estimates in addition to point estimates. Second, they exhibit better convergence due to the optimization of the
Qiang Wu, Xufeng Zheng, Chengshu Li 0001
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