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Robust adaptive multiuser detection for CDMA frequency-selective fading channels

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3 Author(s)
Hongwei Zhou ; Department of Civil Engineering, Imperial College London, SW7 2AZ, United Kingdom ; Pei Xiao ; Colin Cowan

Robust adaptive multiuser detection schemes are developed for direct-sequence code-division multiple-access (DS-CDMA) multipath frequency-selective fading channels. Multiple access interference (MAI) and intersymbol interference (ISI) are presented in identical format in the expanded signal subspace, which provides convenience for symbol-by-symbol multiuser detection. The proposed multiuse detectors are designed in the expanded signal subspace, and subspace estimation and Kalman filtering algorithms are developed for their adaptive implementation. It is demonstrated by simulation that these adaptive detectors are robust against subspace estimation error and can effectively suppress both MAI and ISI and converge to the optimum SINR.

Published in:

2009 International Conference on Ultra Modern Telecommunications & Workshops

Date of Conference:

12-14 Oct. 2009