基于多中继的双向OFDM系统资源分配算法

发布时间：2018-01-13 06:17

本文关键词：基于多中继的双向OFDM系统资源分配算法　出处：《通信学报》2017年09期 　论文类型：期刊论文

【摘要】：在双向多中继OFDM网络中,提出了一种高信噪比下的功率分配与子载波配对的联合算法,与传统的基于中继选择的算法不同,允许所有中继转发同一子载波对,从而提高系统的额外分集增益。该算法在系统总功率受限的条件下,首先应用柯西不等式优化分配了所有中继总功率为定值时各个中继的最优功率,简化原有的最优系统模型;再应用二分法,通过最大化不同子载波对下的等效信道增益计算出源节点与中继节点的功率分配;最后通过凸规划分配不同子载波对的功率,并应用匈牙利算法进行子载波配对,获得最大的系统容量。由于双向多中继网络中功率分配算法过于复杂,目前尚没有计算复杂度较低的最优功率分配方式,该算法大大降低了功率分配的复杂度,并通过仿真结果表明其性能优于最优单中继选择算法和基于中继选择的功率分配算法。
[Abstract]:In bidirectional multi-relay OFDM networks, a joint algorithm of power allocation and sub-carrier pairing under high signal-to-noise ratio is proposed, which is different from the traditional algorithm based on relay selection. It allows all relays to forward the same subcarrier pair, thus increasing the additional diversity gain of the system. The algorithm is limited by the total power of the system. Firstly, the Cauchy inequality is used to optimize the optimal power distribution of all relays when the total relay power is fixed, which simplifies the original optimal system model. Then the power allocation between the source node and the relay node is calculated by maximizing the equivalent channel gain under different sub-carrier pairs by using the dichotomy method. Finally, the power of different subcarrier pairs is allocated by convex programming, and the maximum system capacity is obtained by using the Hungarian algorithm. Because of the complexity of the power allocation algorithm in bidirectional multi-relay networks. At present, there is no optimal power allocation method with low computational complexity, which greatly reduces the complexity of power allocation. The simulation results show that its performance is superior to the optimal single relay selection algorithm and the power allocation algorithm based on relay selection.
【作者单位】：南京邮电大学江苏省无线通信重点实验室;教育部宽带无线通信与传感网技术重点实验室;
【基金】：国家自然科学基金资助项目(No.61571234,No.61631020) 国家重点基础研究发展计划(“973”计划)基金资助项目(No.2013CB329005)~~
【分类号】：TN929.53
【正文快照】： 1引言在协同通信的模型中,一组中继将从源节点接收到的信号转发给目的节点,它不仅可以降低信号的中断概率,同时也使接收端获得了空间分集增益。然而,实际应用的中继模型一般采用半双工技术,在同一时间段内,中继要么接收信号,要么发送信号,这就造成了系统的总频谱效率降低一半

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