tailieunhanh - Báo cáo hóa học: " Research Article Joint Linear Filter Design in Multi-User Cooperative Non-Regenerative MIMO Relay 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: Research Article Joint Linear Filter Design in Multi-User Cooperative Non-Regenerative MIMO Relay Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 670265 13 pages doi 2009 670265 Research Article Joint Linear Filter Design in Multi-User Cooperative Non-Regenerative MIMO Relay Systems Gen Li 1 2 Ying Wang 1 2 Tong Wu 1 2 and Jing Huang1 2 1 Wireless Technology Innovation Institute Beijing University of Posts and Telecommunications BUPT Beijing 100876 China 2Key Laboratory of Universal Wireless Communications Ministry of Education Beijing 100876 China Correspondence should be addressed to Gen Li buptligen@ Received 30 November 2008 Revised 2 April 2009 Accepted 1 July 2009 Recommended by Yonina C. Eldar This paper addresses the filter design issues for multi-user cooperative non-regenerative MIMO relay systems in both downlink and uplink scenario. Based on the formulated signal model the filter matrix optimization is first performed for direct path and relay path respectively aiming to minimize the mean squared error MSE . To be more specific for the relay path we derive the local optimal filter scheme at the base station and the relay station jointly in the downlink scenario along with a more practical suboptimal scheme and then a closed-form joint local optimal solution in the uplink scenario is exploited. Furthermore the optimal filter for the direct path is also presented by using the exiting results of conventional MIMO link. After that several schemes are proposed for cooperative scenario to combine the signals from both paths. Numerical results show that the proposed schemes can reduce the bit error rate BER significantly. Copyright 2009 Gen Li et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction Wireless relays are essential to provide reliable transmission high-throughput and broad coverage for .

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