Title :
Time-Domain Transmit Beamforming for MIMO-OFDM Systems
Author :
Liang, Yang-wen ; Schober, Robert ; Gerstacker, Wolfgang
Author_Institution :
Univ. of British Columbia, Vancouver
Abstract :
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.
Keywords :
MIMO communication; OFDM modulation; vector quantisation; wireless channels; IEEE 802.11n channels; MIMO-OFDM systems; channel state information; finite-rate feedback channels; global vector quantization; multiple-input multiple-output systems; orthogonal frequency division multiplexing systems; time-domain transmit beamforming; Array signal processing; Channel state information; Feedback; Filters; MIMO; Mutual information; OFDM; Time domain analysis; Transmitters; Vector quantization;
Conference_Titel :
Global Telecommunications Conference, 2007. GLOBECOM '07. IEEE
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4244-1042-2
Electronic_ISBN :
978-1-4244-1043-9
DOI :
10.1109/GLOCOM.2007.680
