【摘要】 为提高下行非正交多址接入-电力线通信(non-orthogonal multiple access&power line communication,NOMA-PLC)系统的吞吐量和用户容纳数，考虑在对数正态衰落的PLC信道上引入NOMA技术，并对其功率分配方法进行研究。所述下行NOMA-PLC系统中包含多个NOMA集群，每个集群在独立的资源块中运行。通过将系统和速率最大化中的最优功率分配问题等价转化为每个集群最小功耗问题，使每个NOMA集群等效转化为一个虚拟正交多址接入(orthogonal multiple access,OMA)用户，以闭合形式获得用户有效信道增益；提出一种基于快速注水算法的功率分配方案，利用注水算法对和速率最大化问题进行求解，求得全局最优功率分配方案。为验证所提方法的有效性，对提出的功率分配方法进行Monte-Carlo仿真分析，结果表明：相较于传统OMA-PLC系统，所提出的NOMA-PLC功率分配方案在系统中断概率、发送端最小功耗、平均和速率方面性能得到明显提升。更多还原

【Abstract】 In order to improve the throughput and user capacity of the downlink non-orthogonal multiple access &power line communication(NOMA-PLC) system, this paper proposes incorporating NOMA technology into the PLC channel with lognormal fading, and studies the optimal power allocation scheme. Assuming that the downlink NOMA-PLC system contains multiple NOMA clusters, and each cluster operates in an independent resource block, the optimal power allocation problem in the system and rate maximization is equivalent to the minimum power consumption problem of each cluster, and each NOMA cluster is equivalent to a virtual orthogonal multiple access(OMA) user to obtain the effective channel gain of the user in a closed form. Then, the proposed fast water injection algorithm is used to solve the sum rate maximization problem, and finally the global optimal power allocation scheme is obtained and analyzed by Monte-Carlo simulation. The simulation results show that compared with the traditional OMA-PLC system, the NOMA-PLC power allocation scheme proposed in this paper has significantly improved performance in terms of system outage probability,minimum power consumption of the transmitter, and average sum-rate.更多还原