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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 Processing for an Amplify-and-Forward MIMO Relay Channel with Imperfect Channel State Information | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 640186 13 pages doi 10.1155 2010 640186 Research Article Joint Linear Processing for an Amplify-and-Forward MIMO Relay Channel with Imperfect Channel State Information Batu K. Chalise1 and Luc Vandendorpe2 1 Center for Advanced Communications Villanova University Villanova PA 19085 USA 2 Communication and Remote Sensing Laboratory Universit catholique de Louvain Place du Levant 2 1348 Louvain la Neuve Belgium Correspondence should be addressed to Batu K. Chalise batu.chalise@villanova.edu Received 22 March 2010 Accepted 5 August 2010 Academic Editor Kostas Berberidis Copyright 2010 B. K. Chalise and L. Vandendorpe. 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. The problem of jointly optimizing the source precoder relay transceiver and destination equalizer has been considered in this paper for a multiple-input-multiple-output MIMO amplify-and-forward AF relay channel where the channel estimates of all links are assumed to be imperfect. The considered joint optimization problem is nonconvex and does not offer closed-form solutions. However it has been shown that the optimization of one variable when others are fixed is a convex optimization problem which can be efficiently solved using interior-point algorithms. In this context an iterative technique with the guaranteed convergence has been proposed for the AF MIMO relay channel that includes the direct link. It has been also shown that for the double-hop relay case without the receive-side antenna correlations in each hop the global optimality can be confirmed since the structures of the source precoder relay transceiver and destination equalizer have closed forms and the remaining joint power allocation can be solved using Geometric Programming GP .
