基于MISO-NOMA的新型用户分组和功率分配的研究

A Study of New User Grouping and Power Allocation Based on MISO-NOMA

非正交多址技术(Non-Orthogonal Multiple Access,NOMA)作为5G的候选技术之一,相较于传统的正交多址技术(Orthogonal Multiple Access,OMA)以其能够取得更高的用户接入量与传输可靠性受到了广泛关注。研究多输入单输出-非正交多址(Multiple Input Single Output Non-Orthogonal Multiple Access,MISO-NOMA)上行链路资源分配的问题,以最大化系统和速率为优化目标提出一种新型的用户分组方式及功率分配方案。由于原问题是复杂的非凸优化问题,为了解决此问题,在用户分组的环间采取了固定功率分配的思想,将原问题简化,并在环内采用了动态规划的思想,通过串行干扰抵消(Successive Interference Cancellation,SIC)的解调顺序将原问题分解为外环和内环的两个子问题,并通过分数功率分配逐步求得其次优解。仿真结果表明,新型的用户分组和功率分配的方式可以有效提高MISO-NOMA系统的和速率。

Non-Orthogonal Multiple Access(NOMA)is one of the candidate technologies for 5G.Compared with the traditional Orthogonal Multiple Access(OMA),it can achieve higher user access.The volume and transmission reliability have received extensive attention.Study the problem of Multiple Input Single Output Non-Orthogonal Multiple Access(MISO-NOMA)uplink resource allocation,and propose a new type of user grouping with the optimization goal of maximizing the system and rate Method and power distribution plan.Since the original problem is a complex non-convex optimization problem,in order to solve this problem,the idea of fixed power allocation is adopted between the user grouping rings,the original problem is simplified,and the idea of dynamic programming is adopted in the ring,through serial interference,the demodulation sequence of Cancellation Successive Interference Cancellation(SIC)decomposes the original problem into two sub-problems of outer loop and inner loop,and the next best solution is gradually obtained through fractional power allocation.The simulation results show that the new way of user grouping and power allocation can effectively improve the sum rate of the MISO-NOMA system.