Opportunistic two-way relaying using time control over fading channels

LIU Jianquan; TAO Meixia; XU Youyun

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Opportunistic two-way relaying using time control over fading channels

LIU Jianquan 1,TAO Meixia 1 *,XU Youyun 2

1.Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, 2002402

2.Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, 2002402；Institute of Communications Engineering, PLA University of Science&Technology, Nanjing 210007

*Correspondence author

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Funding: the National Natural Science Foundation of China （No.60902019）, The Doctoral Fund of Ministry of Education of China （No.200802481002）

Opened online:23 December 2011

Accepted by: none

Citation: LIU Jianquan,TAO Meixia,XU Youyun.Opportunistic two-way relaying using time control over fading channels[OL]. [23 December 2011] http://en.paper.edu.cn/en_releasepaper/content/4455956

This paper studies two-way communications over a three-node Gaussian and Fading relay channel. Six-step opportunistic protocol and superimposed XOR-based decode-and-forward (DF) relay scheme are present. The achievable rate regions of the proposed opportunistic strategy have been analyzed by optimal time control and considering unequal packet length. For comparison, two-step protocol with optimal or equal time control and bitwise XOR-based DF and superposition-based DF are considered, respectively. This paper also studies the performance of weighted maximum sum-rate for the proposed 6-step opportunistic strategies at different relay locations in Rayleigh channel from three point of view: 1) maximum sum-rate without any constraint. 2) rate pairs under maximum weighted sum-rate with fairness. 3) service delay versus packet arrival rate with queue.

Keywords:Communications and information system;two-way relaying;physical layer network coding;time control;fading channels

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