协作NOMA系统中用户配对和中继选择联合算法  

Joint Algorithm for User Pairing and Relay Selection in Cooperative NOMA Systems

作　　者：龙恳[1] 王奕 谭路垚 王亚领 陈兴 LONG Ken;WANG Yi;TAN Lu-yao;WANG Ya-ling;CHEN Xing(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《小型微型计算机系统》2022年第10期2214-2218,共5页Journal of Chinese Computer Systems

基　　金：国家科技重大专项项目(2017ZX03001004)资助.

摘　　要：针对协作非正交多址接入系统(C-NOMA)中多中继多用户场景,提出了一种用户配对和中继选择联合算法(JUPRS),以提高系统的中断概率.算法利用最大距离准则、最优信道条件准则和最大瞬时速率准则联合完成用户与用户配对和用户对与中继器配对两项工作.分析推导了所提算法的中断概率闭式表达式和在大功率传输下的渐进表达式.蒙特卡罗仿真结果表明JUPRS算法能同时解决用户配对和中继选择问题,相比于传统正交多址接入系统,协作中继非正交多址接入系统可以获得更优的中断性能,且提高系统中中继器数量或适当调整功率分配系数可以显著增加系统中断性能.A joint user-pairing and relay selection algorithm(JUPRS)is proposed to improve the outage probability of the system for multi-relay multi-user scenarios in Cooperative Non-orthogonal Multiple Access systems(C-NOMA).The algorithm utilized the maximum distance criterion,the optimal channel condition criterion,and the maximum instantaneous rate criterion to accomplish both user-user pairing and user-relay pairing.The closed-form expressions for the outage probability and the asymptotic expressions for the proposed algorithm under high-power transmission were derived analytically.The Monte Carlo simulation results show that the JUPRS algorithm can solve the user-pairing and relay selection problems simultaneously,and the cooperative relay non-orthogonal multiple access system can obtain better transmission rate and outage probability compared with the traditional orthogonal multiple access system,and increasing the number of relays in the system or appropriately adjusting the power allocation factor can significantly increase the system outage probability.

关 键 词：非正交多址接入系统 中继协作技术 中断概率 用户配对 中继选择 

分 类 号：TN914[电子电信—通信与信息系统]