Turbo Coded Iterative V-BLAST System Using Maximum a Posteriori Criterion

Youngsoo YUK  Kyunbyung KO  Cheolwoo YOU  Hyunshik NA  Daesik HONG  Changeon KANG  

IEICE TRANSACTIONS on Communications   Vol.E86-B   No.7   pp.2198-2202
Publication Date: 2003/07/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technology
V-BLAST,  turbo code,  iterative decoding,  

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This letter contains our proposal for a new iterative decoding algorithm for Turbo coded V-BLAST system. The proposed algorithm is based on maximum a posteriori (MAP) decision criterion. In a V-BLAST system concatenated with Turbo codes, the extrinsic information from the soft output channel decoder can be utilized as a priori probability, making it possible to apply MAP decision criteria to the V-BLAST decoding process. The MAP decision criterion is applied to the V-BLAST ordering and slicing procedure, resulting in a considerable gain in bit error performance. As the iteration rate increases, the proposed system exhibits performance similar to that of system with ideal sliced.