TAILIEUCHUNG - Báo cáo hóa học: " Optimal STBC Precoding with Channel Covariance Feedback for Minimum Error Probability"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Optimal STBC Precoding with Channel Covariance Feedback for Minimum Error Probability | EURASIP Journal on Applied Signal Processing 2004 9 1257-1265 2004 Hindawi Publishing Corporation Optimal STBC Precoding with Channel Covariance Feedback for Minimum Error Probability Yi Zhao Department of Electrical and Computer Engineering University of Toronto 10 King s College Road Toronto ON Canada M5S 3G4 Email zhaoyi@ Raviraj Adve Department of Electrical and Computer Engineering University of Toronto 10 King s College Road Toronto ON Canada M5S 3G4 Email rsadve@ Teng Joon Lim Department of Electrical and Computer Engineering University of Toronto 10 King s College Road Toronto ON Canada M5S 3G4 Email limtj@ Received 31 May 2003 Revised 15 January 2004 This paper develops the optimal linear transformation or precoding of orthogonal space-time block codes STBC for minimizing probability of decoding error when the channel covariance matrix is available at the transmitter. We build on recent work that stated the performance criterion without solving for the transformation. In this paper we provide a water-filling solution for multi-input single-output MISO systems and present a numerical solution for multi-input multi-output MIMO systems. Our results confirm that eigen-beamforming is optimal at low SNR or highly correlated channels and full diversity is optimal at high SNR or weakly correlated channels in terms of error probability. This conclusion is similar to one reached recently from the capacity-achieving viewpoint. Keywords and phrases MIMO space-time block coding beamforming linear precoding. 1. INTRODUCTION In wireless communications the adverse effects of channel fading can be mitigated by transmission over a diversity of independent channels. A large and growing body of results have firmly established the potential of space-time coding 1 2 3 in multi-input multi-output MIMO systems which use antenna arrays at the transmitter and the receiver to provide spatial diversity at both ends of a communications .

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