標題: An OSIC based reduced-rank MIMO equalizer using conjugate gradient algorithm
作者: Ho, CL
Lin, GJ
Lee, TS
資訊工程學系
電信工程研究所
Department of Computer Science
Institute of Communications Engineering
關鍵字: MIMO;decision feedback equalizer;ordered successive interference cancellation;reduced rank;conjugate gradient algorithm
公開日期: 1-Sep-2003
摘要: A reduced complexity multiple-input multiple-output (MIMO) equalizer with ordered successive interference cancellation (OSIC) is proposed for combating intersymbol interference (ISI) and cochannel interference (CCI) over frequency-selective multipath channels. It is developed as a reduced-rank realization of the conventional MMSE decision feedback equalizer (DFE). In particular, the MMSE weight vectors at each stage of OSIC are computed based on the generalized sidelobe canceller (GSC) technique and reduced-rank processing is incorporated by using the conjugate gradient (CG) algorithm for reduced complexity implementation. The CG algorithm leads to a best low-rank representation of the GSC blocking matrix via an iterative procedure, which in turn gives a reduced-rank equalizer weight vector achieving the best compromise between ISI and CCI suppression. With the dominating interference successfully cancelled at each stage of OSIC, the number of iterations required for the convergence of the CG algorithm decreases accordingly for the desired signal. Computer simulations demonstrate that the proposed reduced-rank MIMO DFE can achieve nearly the same performance as the full-rank MIMO MMSE DFE with an effective rank much lower than the dimension of the signal-plus-interference subspace.
URI: http://hdl.handle.net/11536/27594
ISSN: 0916-8516
期刊: IEICE TRANSACTIONS ON COMMUNICATIONS
Volume: E86B
Issue: 9
起始頁: 2656
結束頁: 2664
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