MIMO-OFDM MAP Receiver with Spatial-Temporal Filters Employing Decision-Directed Recursive Eigenvalue Decomposition Parameter Estimation

Kazuhiko FUKAWA
Hiroshi SUZUKI
Satoshi SUYAMA

IEICE TRANSACTIONS on Communications   Vol.E91-B    No.4    pp.1112-1121
Publication Date: 2008/04/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.4.1112
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
mobile communication,  MIMO-OFDM,  MAP receiver,  cochannel interference,  recursive eigenvalue decomposition,  parameter estimation,  

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This paper proposes a new parameter estimation method for the MIMO-OFDM MAP receiver with spatial-temporal filters. The proposed method employs eigenvalue decomposition (EVD) so as to attain precise estimates especially under interference-limited conditions in MIMO-OFDM mobile communications. Recursive EVD is introduced to reduce the computational complexity compared to the nonrecursive EVD. The spatial-temporal prewhitening is placed prior to FFT because this arrangement is superior to that of conventional prewhitening posterior to FFT in accuracy of the parameter estimation. In order to improve tracking capability to fast fading, the proposed scheme applies a decision-directed algorithm to the parameter estimation by using log-likelihood ratios of coded bits. Computer simulations demonstrate that the proposed scheme can track fast fading and reduce the complexity to 18 percents of the conventional one, and that the spatial-temporal filtering prior to FFT outperforms the conventional one posterior to FFT.