Minimum BER Transmit Beamforming for MIMO-OFDM Systems with Finite Rate Feedback

TitleMinimum BER Transmit Beamforming for MIMO-OFDM Systems with Finite Rate Feedback
Publication TypeConference Paper
Year of Publication2008
AuthorsLiang, Y. -wen, R. Schober, and W. Gerstacker
Conference NameCommunications, 2008. ICC '08. IEEE International Conference on
Pagination4353 -4358
Date Publishedmay.
Keywordsbit error rate, channel state information, codebook design, cyclic BF filters, error statistics, finite rate feedback, finite-rate feedback channels, global vector quantization, IEEE 802.11n channels, IEEE standards, MIMO communication, MIMO-OFDM systems, minimum BER transmit beamforming, multiple-input multiple-output system, numerical methods, OFDM modulation, optimization problems, orthogonal frequency division multiplexing system, vector quantisation, wireless channels, wireless LAN

In this paper, we consider minimum bit error rate (BER) beamforming (BF) for multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems. In particular, assuming perfect channel state information (CSI) at the transmitter we optimize cyclic BF filters (C-BFFs) for minimization of the average BER and the maximum sub-carrier BER, respectively. If the C-BFF length Lg is equal to the number of sub-carriers Nc, closed-form solutions to both optimization problems exist. For the practically relevant case Lg lt; Nc we present numerical methods for calculation of the optimum C-BFFs. For finite-rate feedback channels we provide a global vector quantization (GVQ) scheme for codebook design. Simulation results for typical IEEE 802.11n channels confirm the excellent performance of the proposed minimum BER BF schemes for both uncoded and coded MIMO-OFDM systems.


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