Adaptive MMSE Algorithm Used in Turbo Iterative SoIC of V-Blast System

Huiqiang ZHOU  Yunzhou LI  Shidong ZHOU  Jing WANG  

IEICE TRANSACTIONS on Communications   Vol.E88-B    No.10    pp.4129-4132
Publication Date: 2005/10/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.10.4129
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
V-Blast,  MMSE,  MRC,  turbo code,  SoIC,  

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Based on the minimum mean square error (MMSE) detection with iterative soft interference cancellation (SoIC), we propose an adaptive MMSE (A-MMSE) algorithm which acts as an MMSE operator at the beginning of iteration and a maximum ratio combination (MRC) when the interference is nearly cancelled. In our algorithm, a modified metric matrix based on the reliability of soft information from the decoder output is multiplied by the interference part of channel correlation matrix to update the detection operator. The simulation results have shown that this A-MMSE iterative SoIC algorithm can achieve significant performance advantage over the traditional MMSE iterative SoIC algorithm.