基于NOMA异构云无线接入网的联合子信道和功率分配算法  

Joint sub-channel and power allocation algorithm for downlink NOMA heterogeneous cloud RAN

作　　者：顾兆伟 江凌云[1] Gu Zhaowei;Jiang Lingyun(College of Telecommunications&Information Engineering,Nanjing University of Posts&Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学通信与信息工程学院,南京210003

出　　处：《计算机应用研究》2022年第9期2804-2811,共8页Application Research of Computers

摘　　要：针对基于NOMA异构云无线接入网中增加网络效用需要以更高的能源消耗为代价,从而导致能源效率低的问题,提出了一种联合子信道和功率分配方案。首先,该方案定义网络效用和电网能源成本之间的差值为系统收益,考虑了最大传输功率、能量收集(energy harvesting,EH)电池容量、用户最小数据速率需求和跨层干扰阈值等约束,以最大化系统收益为目标建立优化问题;然后,采用贪心算法给用户配对并分配子信道,实现低复杂度次优解;最后,利用基于交替方向乘子法的拉格朗日最大化方法优化了功率分配。仿真结果表明,与NOMA系统中未配备EH单元的方案相比,系统收益提高了约18.8%;与OFDMA系统中配备EH单元的方案相比,系统收益提高了约11.8%。In heterogeneous cloud radio access network based on NOMA,the increase of network utility comes at the cost of energy consumption,which leads to low energy efficiency.To solve this problem,this paper proposed a joint sub-channel and power allocation solution.The algorithm firstly defined the difference between network utility and grid energy cost as the system revenue,and then established an optimization problem with the goal of maximizing system revenue where were considered constraints of maximum transmit power,battery capacity of energy harvesting(EH),user’s minimum data rate requirements and cross-layer interference thresholds.Next,it used the greedy algorithm to pair users and assign sub-channels,which obtained a low-complexity sub-optimal solution.Finally,it used the Lagrangian maximization method based on the alternating direction method of multipliers to optimize the power allocation.The simulation results show that,compared with the scheme in NOMA system without considering EH units,the system revenue has increased by about 18.8%;compared with that in OFDMA system equipped with EH units,the system revenue has increased by about 11.8%.

关 键 词：异构云无线接入网 NOMA 混合能源 子信道分配 功率分配 

分 类 号：TN929.5[电子电信—通信与信息系统]