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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/14211

Title: Fading Correlations for Wireless Cooperative Communications: Diversity and Coding Gains
Authors: Qian, Shen
He, Jiguang
Juntti, Markku
Matsumoto, Tad
Keywords: Cooperation techniques
relay channels
fading variation
outage probability
diversity and coding gains
spatial and temporal correlations
source-channel separation theorem
Issue Date: 2017-04-28
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Magazine name: IEEE Access
Volume: 5
Start page: 8001
End page: 8016
DOI: 10.1109/ACCESS.2017.2699785
Abstract: We theoretically analyze outage probabilities of the lossy-forward (LF), decode-and-forward (DF) and adaptive decode-and-forward (ADF) relaying techniques, with the aim of characterizing the impact of the spatial and temporal correlations of the fading variations. First, the exact outage probability expressions are analytically obtained for LF, DF, and ADF relaying assuming each link suffers from statistically independent Rayleigh fading. Then, approximated, yet accurate closed-form expressions of the outage probabilities for the relaying schemes are derived. Based on the expressions, diversity and coding gains are found. The mathematical methodology for the derivation of the explicit outage probability is further extended to the case where the account is taken of the spatial and temporal correlations of the fading variations. The diversity gains with LF, DF, and ADF are then derived in the presence of the correlations. It is found out that the three techniques can achieve full diversity, as long as the fading variations are not fully correlated. We then investigate the optimal relay location and the optimal power allocation for the three relaying techniques. It is shown that the optimal solutions can be obtained under the framework of convex optimization. It is reveal that in correlated fading, the relay should move close to the destination or allocate more transmit power to the relay for achieving lower outage probabilities, compared to the case in independent fading.
Rights: This is the author's version of the work. Copyright (C) 2017 IEEE. IEEE Access, 5, 2017, pp.8001-8016. DOI:10.1109/ACCESS.2017.2699785. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
URI: http://hdl.handle.net/10119/14211
Material Type: author
Appears in Collections:b11-1. 会議発表論文・発表資料 (Conference Papers)

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