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首页> 外文期刊>Wireless Communications Letters, IEEE >Adaptive Resource Allocation for Improved DF Aided Downlink Multi-User OFDM Systems
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Adaptive Resource Allocation for Improved DF Aided Downlink Multi-User OFDM Systems

机译:改进的DF辅助下行多用户OFDM系统的自适应资源分配

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摘要

In this letter, we propose a joint resource allocation algorithm for an OFDM-based multi-user system assisted by an improved Decode-and-Forward (DF) relay. We aim at maximizing the sum rate of the system by jointly optimizing subcarrier pairing, subcarrier pair-user assignment, and power allocation in such a single DF relay system. When the relay does not perform any transmission on some subcarriers in the second phase, we further allow the source to transmit new symbols on these inactive subcarriers. We effectively solve the formulated mixed integer programming problem by using continuous relaxation and dual minimization methods. Numerical results verify the theoretical analysis, and illustrate the remarkable gains resulted from the extra direct-link transmissions.
机译:在这封信中,我们提出了一种基于OFDM的多用户系统的联合资源分配算法,该算法采用了改进的解码转发(DF)中继。我们旨在通过在这样的单个DF中继系统中共同优化子载波配对,子载波对用户分配和功率分配,来最大化系统的总速率。当中继在第二阶段中不对某些子载波执行任何传输时,我们进一步允许源在这些不活动的子载波上传输新符号。通过使用连续松弛和双重最小化方法,我们有效地解决了制定的混合整数规划问题。数值结果验证了理论分析,并说明了额外的直接链接传输带来的显着收益。

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