Analytical BER Evaluation of ZF Transmit Beamformer with Channel Estimation Error

Seungjae BAHNG  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.8   pp.2097-2102
Publication Date: 2007/08/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.8.2097
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
ZF,  transmit beamformer,  CDMA,  channel estimation error,  

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The minimum mean square error (MMSE) multiple antenna transmission scheme for a code division multiple access (CDMA) system was recently developed by Choi and Perreau [1]. In this paper, we first show that the zero-forcing (ZF) transmit beamformer for multiple antenna CDMA system has the same form as the MMSE beamformer given by Choi and Perreau. We then develop an analytical method to obtain a closed-form expression of the bit error rate (BER) of the ZF transmit beamformer when there are channel estimation errors. The analytical and simulation results show good agreement, and confirm the importance of accurate channel state information (CSI) at the transmitter when using the ZF transmit beamformer.