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Adaptive MMSE Algorithm Used in Turbo Iterative SoIC of V-Blast System
Huiqiang ZHOU Yunzhou LI Shidong ZHOU Jing WANG
IEICE TRANSACTIONS on Communications
Publication Date: 2005/10/01
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.