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Power Allocation for AmplifyandForward Opportunistic Relaying Systems
Hui HUI Shihua ZHU Gangming LV
Publication
IEICE TRANSACTIONS on Communications
Vol.E92B
No.11
pp.35413545 Publication Date: 2009/11/01
Online ISSN: 17451345
DOI: 10.1587/transcom.E92.B.3541
Print ISSN: 09168516 Type of Manuscript: LETTER Category: Wireless Communication Technologies Keyword: cooperative communication, amplifyandforward, power allocation, outage probability,
Full Text: PDF(141.7KB)>>
Summary:
In this letter, power allocation methods are devised for AmplifyandForward (AF) opportunistic relaying systems aiming at minimizing the outage probability. First, we extend the result on outage probability in and develop an approximate expression to simplify the power allocation problem. A corresponding optimization problem is constructed and proved to be convex. Then an iterative numerical method is proposed to find the optimal power allocation factor. We also propose a nearoptimal method which can directly calculate the power allocation factor to reduce computational complexity. Numerical results show that the proposed methods have a similar performance with the ideal one, and outperform equal power allocation significantly with little overhead.

