Optimization of Power Allocation and Relay Position in Multihop Relay Networks Over Generalized Fading Channels

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This paper addresses optimizations of both power allocation (PA) and relay position (RP), PA-only, and RP-only in multihop relay networks under a generalized model of fading channels. By adopting a parameterized model of fading distributions in the high-signal-to-noise-ratio region, we formulate the optimization problems in a unified framework, which are applicable to most of fading channels and solved with the Lagrange multiplier method. The optimal solutions are derived in explicit forms that facilitate the analysis on the performance of multihop networks. The analysis shows that the diversity order of the end-to-end performance is governed by the hop with the maximum diversity order in the cases of the joint optimization of PA and RP and optimization of RP-only while it is governed by the hop with the minimum diversity order in the case of the optimization of PA-only. Henceforth, the optimization of RP, improving both the diversity order and coding gain, leverages the system performance more significantly than that of PA, improving only the coding gain. By improving the diversity order and coding gain simultaneously, the joint optimization of RP and PA shows the best performance.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2015-11
Language
English
Article Type
Article
Citation

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, v.64, no.11, pp.5031 - 5041

ISSN
0018-9545
DOI
10.1109/TVT.2014.2379934
URI
http://hdl.handle.net/10203/205560
Appears in Collection
EE-Journal Papers(저널논문)
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