tailieunhanh - Báo cáo hóa học: " Research Article Coordinated Transmission of Interference Mitigation and Power Allocation in Two-User Two-Hop 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 Coordinated Transmission of Interference Mitigation and Power Allocation in Two-User Two-Hop MIMO Relay Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 132910 15 pages doi 2010 132910 Research Article Coordinated Transmission of Interference Mitigation and Power Allocation in Two-User Two-Hop MIMO Relay Systems Hee-Nam Cho Jin-Woo Lee and Yong-Hwan Lee School of Electrical Engineering and INMC Seoul National University Kwan-ak . Box 34 Seoul 151-600 Republic of Korea Correspondence should be addressed to Hee-Nam Cho hncho@ Received 30 October 2009 Revised 11 May 2010 Accepted 15 June 2010 Academic Editor Guosen Yue Copyright 2010 Hee-Nam Cho 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. This paper considers coordinated transmission for interference mitigation and power allocation in a correlated two-user two-hop multi-input multioutput MIMO relay system. The proposed transmission scheme utilizes statistical channel state information CSI . transmit correlation to minimize the cochannel interference CCI caused by the relay. To this end it is shown that the CCI can be represented in terms of the eigenvalues and the angle difference between the eigenvectors of the transmit correlation matrix of the intended and CCI channel and that the condition minimizing the CCI can be characterized by the correlation amplitude and the phase difference between the transmit correlation coefficients of these channels. Then a coordinated userscheduling strategy is designed with the use of eigen-beamforming to minimize the CCI in an average sense. The transmit power of the base station and relay is optimized under separate power constraint. Analytic and numerical results show that the proposed scheme can maximize the achievable sum rate when the principal eigenvectors of the transmit correlation matrix of the intended and the CCI .