Regenerative Strategy for Fairness in Bi-directional Three-Node Relaying

Ning HU  Xiaofeng ZHONG  Ming ZHAO  Jing WANG  

IEICE TRANSACTIONS on Communications   Vol.E91-B    No.8    pp.2736-2739
Publication Date: 2008/08/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.8.2736
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
bi-directional relaying,  fairness,  network coding,  power optimization,  regenerative strategy,  

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The fairness solution without deteriorating the system sum-rate is a challenge under a total energy constraint. One regenerative strategy is proposed to improve the fairness for bi-directional three-node relaying, which is based on decode-and-forward technique with network coding and power optimization. In this letter, the application of network coding decreases the number of transmission phases from traditional four phases to three phases. Moreover, the proposed power optimization algorithm can be applied in practical system, which transforms max-min optimization problem to linear programming (LP) with low complexity. Numerical simulations shows this strategy enhances the minimum of unidirectional transmission rate up to 94% as compared to a four-phase bi-directional strategy, and up to 46% as compared to the three-phase bi-directional strategy with equal-power allocation.