Title :
Minimum BER Transmit Beamforming for MIMO-OFDM Systems with Finite Rate Feedback
Author :
Liang, Yang-wen ; Schober, Robert ; Gerstacker, Wolfgang
Author_Institution :
Univ. of British Columbia, Vancouver, BC
Abstract :
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 < 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.
Keywords :
IEEE standards; MIMO communication; OFDM modulation; error statistics; vector quantisation; wireless LAN; wireless channels; IEEE 802.11n channels; MIMO-OFDM systems; bit error rate; channel state information; codebook design; cyclic BF filters; finite rate feedback; finite-rate feedback channels; global vector quantization; minimum BER transmit beamforming; multiple-input multiple-output system; numerical methods; optimization problems; orthogonal frequency division multiplexing system; Array signal processing; Bit error rate; Channel state information; Closed-form solution; Feedback; Information filtering; Information filters; MIMO; OFDM; Transmitters;
Conference_Titel :
Communications, 2008. ICC '08. IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2075-9
Electronic_ISBN :
978-1-4244-2075-9
DOI :
10.1109/ICC.2008.817
