基于子空间新型跟踪策略的RLS盲多用户检测算法

doi:10.3969/j.issn.1001-2400.2011.02.029

Abstract

Abstract:

To overcome the issue that the performance of the subspace-based blind multiuser detector degrades due to underestimation of the sources' number in direct sequence/code division multiple access (DS/CDMA) systems, a novel subspace tracking strategy is presented and the recursive least square (RLS) blind multiuser detection algorithm is modified. As for the novel subspace tracking strategy, the desired user's signature waveform constitutes one part of the signal subspace and its orthogonal complement is tracked as the other parts of that signal. This brings the benefits of a small signal subspace estimation error and lower computational complexity. Even in the underestimation of the sources' number, the performance of the detector does not degrade significantly because the signal subspace always maintains the information on the desired user. The RLS blind multiuser detection algorithm is combined with the subspace approach. As a result of forward error feedback, this algorithm can reduce sensitivity to signal subspace estimation. Simulations are provided to demonstrate the effectiveness of the proposed detector.

Key words: code division multiple access (CDMA), multiuser detection, recursive least square (RLS), subspace tracking, source enumeration

HUANG Ruhao;HE Peiyu;YU Wenjun;GAO Yong. RLS blind multiuser detection based on a novel subspace tracking strategy[J].J4, 2011, 38(2): 162-166.

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RLS blind multiuser detection based on a novel subspace tracking strategy

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