Pre-Whitening QR-Decomposition Maximum Likelihood Detection for Co-channel Interference Rejection in MIMO Systems

Masaaki FUJII  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.7   pp.2529-2532
Publication Date: 2009/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.2529
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
QR-decomposition MLD,  co-channel interference,  pre-whitening MLD,  

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We describe a co-channel interference rejection scheme that is suitable for QR-decomposition maximum likelihood detection (MLD) in multiple-input and multiple output (MIMO) systems. A pre-whitening matrix for interference rejection is decomposed into a triangular matrix and its Hermitian matrix by using a complex Gaxpy version of the Cholesky algorithm. The decomposed triangular matrix is used as a spatial pre-filter to whiten co-channel interference. Simulation results demonstrate that the proposed scheme can suppress co-channel interference streams at the cost of receive diversity order and achieves better transmission performance than QR-decomposition MLD itself in MIMO channels with co-channel interference.