tailieunhanh - Báo cáo hóa học: " Research Article Power and Resource Allocation for Orthogonal Multiple Access 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 Power and Resource Allocation for Orthogonal Multiple Access Relay Systems | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 476125 15 pages doi 2008 476125 Research Article Power and Resource Allocation for Orthogonal Multiple Access Relay Systems Wessam Mesbah and Timothy N. Davidson Department of Electrical and Computer Engineering McMaster University Hamilton ON Canada L8S 4K1 Correspondence should be addressed to Timothy N. Davidson davidson@ Received 1 November 2007 Revised 19 April 2008 Accepted 6 May 2008 Recommended by J. Wang We study the problem of joint power and channel resource allocation for orthogonal multiple access relay MAR systems in order to maximize the achievable rate region. Four relaying strategies are considered namely regenerative decode-and-forward RDF nonregenerative decode-and-forward NDF ampliiy-and-forward AF and compress-and-forward CF . For RDF and NDF we show that the problem can be formulated as a quasiconvex problem while for AF and CF we show that the problem can be made quasiconvex if the signal-to-noise ratios of the direct channels are at least -3 dB. Therefore efficient algorithms can be used to obtain the jointly optimal power and channel resource allocation. Furthermore we show that the convex subproblems in those algorithms admit a closed-form solution. Our numerical results show that the joint allocation of power and the channel resource achieves significantly larger achievable rate regions than those achieved by power allocation alone with fixed channel resource allocation. We also demonstrate that assigning different relaying strategies to different users together with the joint allocation of power and the channel resources can further enlarge the achievable rate region. Copyright 2008 W. Mesbah and T. N. Davidson. 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 .

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