新的NOMA多用户功率分配方法

New NOMA Multi-user Power Allocation Method

正交多路访问(Orthogonal Multiple Access,OMA)只能按时间或频率给单一用户分配单一的无线资源,而非正交多路访问(Non-Orthogonal Multiple Access,NOMA)技术可以将同一资源分配给多个用户,大大提高了频谱效率和数据速率,能够更好地满足5G通信中多用户的需求。为了满足未来通信需求,提出了3种新的功率分配方案。在满足各个用户目标数据速率的同时,最大化发射功率之差以便接收端利用连续干扰消除(Successive Interference Cancellation,SIC)技术对各个用户进行恢复,并得到在此条件下的最大用户总容量。仿真结果表明,提出的方案得出的最大用户总容量均优于传统的OMA技术。

OMA(Orthogonal Multiple Access)can only allocate a single wireless resource to a single user on time or frequency,while NOMA(Non-Orthogonal Multiple Access)can allocate the same resource to multiple users.The spectrum efficiency and data rate are greatly improved,which can better meet the needs of multiple users in 5G communications.In order to meet future communication needs,three new power allocation schemes are proposed.While meeting the target data rate of each user,they maximize the difference in transmit power,so that the receiving end can use the SIC(Successive Interference Cancellation)technology to recover each user,and obtain the maximum total user capacity under this condition.The simulation results indicate that the maximum total user capacity obtained by proposed schemes is better than the traditional OMA technology.