tailieunhanh - Báo cáo hóa học: "Performance Comparisons of MIMO Techniques with Application to WCDMA Systems"

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: Performance Comparisons of MIMO Techniques with Application to WCDMA Systems | EURASIP Journal on Applied Signal Processing 2004 5 649-661 2004 Hindawi Publishing Corporation Performance Comparisons of MIMO Techniques with Application to WCDMA Systems Chuxiang Li Department of Electrical Engineering Columbia University New York NY 10027 USA Email cxli@ Xiaodong Wang Department of Electrical Engineering Columbia University New York NY 10027 USA Email wangx@ Received 11 December 2002 Revised 1 August 2003 Multiple-input multiple-output MIMO communication techniques have received great attention and gained significant development in recent years. In this paper we analyze and compare the performances of different MIMO techniques. In particular we compare the performance of three MIMO methods namely BLAST STBC and linear precoding decoding. We provide both an analytical performance analysis in terms of the average receiver SNR and simulation results in terms of the BER. Moreover the applications of MIMO techniques in WCDMA systems are also considered in this study. Specifically a subspace tracking algorithm and a quantized feedback scheme are introduced into the system to simplify implementation of the beamforming scheme. It is seen that the BLAST scheme can achieve the best performance in the high data rate transmission scenario the beamforming scheme has better performance than the STBC strategies in the diversity transmission scenario and the beamforming scheme can be effectively realized in WCDMA systems employing the subspace tracking and the quantized feedback approach. Keywords and phrases BLAST space-time block coding linear precoding decoding subspace tracking WCDMA. 1. INTRODUCTION Multiple-input multiple-output MIMO communication technology has received significant recent attention due to the rapid development of high-speed broadband wireless communication systems employing multiple transmit and receive antennas 1 2 3 . Many MIMO techniques have been proposed in the literature targeting at different .