Resource optimization for fairness and sum rate tradeoff in multiuser OFDM-based two-way relaying

被引：0
作者：
机构：
[1] Key Laboratory of Mobile Communication Technology, Chongqing University of Posts and Telecommunications
[2] Department of Communication Commanding, Chongqing Communication Institute
来源：
Tang, L. (tangl@cqupt.edu.cn) | 1600年 / Press of Shanghai Scientific and Technical Publishers卷 / 30期
关键词：
OFDM; Power optimization; Proportional fairness; Sub-carrier optimization; Two-way relaying;
D O I：
10.3969/j.issn.0255-8297.2012.01.007
中图分类号：
学科分类号：
摘要：
In OFDM-based cooperative two-way relay networks, sum rate and fairness among user pairs cannot be achieved simultaneously when these user-pairs exchange their information respectively via an amplify-andforward two-way relay. This paper proposes a novel suboptimal resource allocation scheme to trade off the proportional fairness and the system sum rate. This scheme is divided into two steps to maximize the sum rate of the system subject to the constraints of total power and proportionality among user-pair data rate. First, sub-carrier optimization is processed with equal power among every subcarrier to achieve proportional fairness and improve the system sum rate. To further improve the sum rate while maintaining fairness, the total power is allocated to every sub-carrier with an iterative power allocation algorithm. Simulation demonstrates that the proposed scheme of resource allocation can achieve good tradeoff between proportional fairness and system sum rate.
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页码：39 / 44
页数：5
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