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IEICE Transactions on Communications 2008 E91-B(4):1112-1121; doi:10.1093/ietcom/e91-b.4.1112
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Papers -- Wireless Communication Technologies

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

Fan LISHENG1, Kazuhiko FUKAWA1, Hiroshi SUZUKI1 and Satoshi SUYAMA1

1 The authors are with Tokyo Institute of Technology, Tokyo, 152-8550 Japan. E-mail: fanls{at}radio.ss.titech.ac.jp


  Abstract

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.

Key Words: mobile communication, MIMO-OFDM, MAP receiver, cochannel interference, recursive eigenvalue decomposition, parameter estimation

Manuscript received June 13, 2007. Manuscript revised November 14, 2007.


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