论文标题
自适应资源分配以改进DF辅助下行链路多用户OFDM系统
Adaptive Resource Allocation for Improved DF Aided Downlink Multi-user OFDM Systems
论文作者
论文摘要
在这封信中，我们为基于OFDM的多用户系统提出了一种联合资源分配算法，并通过改进的解码和前向（DF）继电器的辅助。我们旨在通过在这样的单个DF继电器系统中共同优化子载波配对，子载波配对分配和功率分配来最大化系统的总和率。当继电器在第二阶段不对某些子载波上执行任何传输时，我们进一步允许源在这些不活动的子载波上传输新符号。我们通过使用持续放松和双重最小化方法有效地解决了配制的混合整数编程问题。数值结果验证了理论分析，并说明了额外的直接链接传输所产生的显着收益。
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.
