不对称双向中继信道最优功率分配算法  

Optimal power allocation algorithm for asymmetric bidirectional relay channel

作　　者：叶志远 赵子岩 赵峰 倪鹏程 蒲强 黄犟 YE Zhiyuan;ZHAO Ziyan;ZHAO Feng;NI Pengcheng;PU Qiang;HUANG Jiang(University of Science and Technology of China,Hefei 230026,China;Anhui Jiyuan Software Co.,Ltd,Hefei 230094,China)

机构地区：[1]中国科学技术大学,安徽合肥230026 [2]安徽继远软件有限公司,安徽合肥230094

出　　处：《现代电子技术》2021年第18期6-10,共5页Modern Electronics Technique

基　　金：国家自然科学基金项目(51977113);国家电网有限公司总部科技项目资助(SGJSXT00DDJS1800068)。

摘　　要：传统算法分配信道最优功率时,对中继节点转发信号的约束条件不到位,编码前后信号能量产生改变,导致信道传输协作传输的中断概率较高。为此,文中提出一种不对称双向中继信道最优功率分配算法。该算法采用多中继AF协作通信网络,接入中继信道,构建不对称双向中继通信网络模型,模拟模型中各节点的信号处理过程,计算源节点和目的节点瞬时接收信噪比,得到信道平均总速率。将平均总速率上界设为目标,计算各节点分配功率在信道总功率中的比重。设置3种中继网络仿真场景,选取信噪比和中继节点归一化距离为变量参数,进行对比实验。结果表明,所提算法降低了信道中断概率,提高了中继信道中断性能。The traditional algorithm has no enough constraint conditions on the relay node′s forwarding signal when it is used to allocate the optimal power of the channel,which makes the signal energy changed before and after coding,results in a high probability of interruption in channel cooperative transmission.Therefore,an optimal power allocation algorithm for asymmetric bidirectional relay channel is proposed.The multi⁃relay AF cooperative communication network is used to access the relay channel,and the asymmetric bidirectional relay communication network model is constructed.The signal processing process of each node in the model is simulated.The instantaneous receiving signal⁃to⁃noise ratio of the source node and the destination node is calculated to obtain the average total rate of the channel.The upper bound of the average total rate is set up as the target to calculate the proportion of each node′s allocated power in the total channel power.Three kinds of relay network simulation scenarios are set up,and the signal⁃to⁃noise ratio and normalized distance of relay nodes are selected as variable parameters.The results of the contrast experiment show that the proposed algorithm can reduce the channel outage probability and improve the outage performance of relay channel.

关 键 词：中继信道 功率分配算法 网络模型 源节点计算 信号处理 变量参数 

分 类 号：TN911.234[电子电信—通信与信息系统]