Time-Domain Transmit Beamforming for MIMO-OFDM Systems

TitleTime-Domain Transmit Beamforming for MIMO-OFDM Systems
Publication TypeConference Paper
Year of Publication2007
AuthorsLiang, Y. -wen, R. Schober, and W. Gerstacker
Conference NameGlobal Telecommunications Conference, 2007. GLOBECOM '07. IEEE
Pagination3579 -3584
Date Publishednov.
Keywordschannel state information, finite-rate feedback channels, global vector quantization, IEEE 802.11n channels, MIMO communication, MIMO-OFDM systems, multiple-input multiple-output systems, OFDM modulation, orthogonal frequency division multiplexing systems, time-domain transmit beamforming, vector quantisation, wireless channels

Transmit beamforming (BF) and receive combining are simple and popular methods for performance enhancement in multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems. In this paper, we propose a novel time-domain BF (TD-BF) scheme for MIMO-OFDM systems which uses cyclic BF filters (C-BFFs). Assuming perfect channel state information (CSI) at the transmitter, the C- BFFs are optimized for maximization of the average mutual information per sub-carrier. Using a global vector quantization approach the C-BFFs are quantized for practical finite-rate feedback channels. Simulation and numerical results for typical IEEE 802.11n channels confirm the excellent performance of the proposed scheme and show that TD-BF has a more favorable performance/feedback rate trade-off than previously proposed frequency-domain BF (FD-BF) schemes.


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