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Precoding Scheme Robust to Imperfect CSI in Downlink Multiuser MIMO-OFDM System Linchen CHANG Kazuhiko FUKAWA Hiroshi SUZUKI Satoshi SUYAMA Publication IEICE TRANSACTIONS on Communications Vol.E94-B No.12 pp.3515-3524 Publication Date: 2011/12/01 Online ISSN: 1745-1345 DOI: 10.1587/transcom.E94.B.3515 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: multiuser MIMO, MIMO-OFDM, precoding, imperfect channel state information, steepest descent algorithm, Full Text: PDF>>
Summary: This paper proposes a precoding scheme for downlink multiuser MIMO-OFDM systems. The proposed precoding employs the minimum average bit error rate (MABER) criterion, and obtains precoding matrices by the steepest descent algorithm in order to minimize average BER of mobile stations. As the cost function of the proposed scheme, an upper bound of the average BER is derived from the pairwise error probability (PEP) and is averaged with respect to channel state information (CSI) errors. Thus, the MABER scheme is robust against imperfect CSI. Computer simulations under a frequency-selective fading condition demonstrate that the proposed precoder is more robust against the CSI errors than both the zero-forcing (ZF) precoder and a robust sum mean square error (SMSE) precoder, and that it is superior in BER to the conventional schemes. | |||||
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