User Fairness Non-Orthogonal Multiple Access (NOMA) for Millimeter-Wave Communications With Analog Beamforming
User Fairness Non-Orthogonal Multiple Access (NOMA) for Millimeter-Wave Communications With Analog Beamforming
复制标题
用于具有模拟波束成形的毫米波通信的用户公平性非正交多址 (NOMA)
DOI：
10.1109/twc.2019.2913844
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发表时间：
2018-11
影响因子：
10.4
通讯作者：
Xiang-Gen Xia
中科院分区：
文献类型：
--
作者：
Zhenyu Xiao;Lipeng Zhu;Zhen Gao;Dapeng Oliver Wu;Xiang-Gen Xia
在毫米波通信中集成非正交多址（mm Wave-NOMA），可以在第五代（5G）及以后的移动通信中显著提高频谱效率，增加用户数量。在本文中，我们考虑了一种下行毫米波- noma蜂窝系统，其中基站安装了模拟波束形成相控阵，并且在同一时频资源块中为多个用户提供服务。为了保证用户公平性，我们制定了联合波束形成和功率分配问题，以最大化用户之间的最小可达速率，即采用最大最小公平性。由于优化变量的非凸性和高维性使问题难以求解，我们提出了一种利用毫米波通道角域空间稀疏性的次优解。在求解中，首先得到闭合型最优功率分配，将联合优化问题简化为等效波束形成问题。然后，设计了合适的波束形成矢量。仿真结果表明，该方案在可达速率方面具有接近上界的性能，明显优于传统的毫米波正交多址（mm Wave- oma）系统。
The integration of non-orthogonal multiple access in millimeter-Wave communications (mm Wave-NOMA) can significantly improve the spectrum efficiency and increase the number of users in the fifth-generation (5G) mobile communication and beyond. In this paper, we consider a downlink mm Wave-NOMA cellular system, where the base station is mounted with an analog beamforming phased array, and multiple users are served in the same time-frequency resource block. To guarantee user fairness, we formulate joint beamforming and power allocation problem to maximize the minimal achievable rate among the users, i.e., we adopt the max–min fairness. As the problem is difficult to solve due to the non-convex formulation and high dimension of the optimization variables, we propose a sub-optimal solution, which makes use of the spatial sparsity in the angle domain of the mm Wave channel. In the solution, the closed-form optimal power allocation is obtained first, which reduces the joint optimization problem into an equivalent beamforming problem. Then, an appropriate beamforming vector is designed. The simulation results show that the proposed solution can achieve a near-upper-bound performance in terms of achievable rate, which is significantly better than that of the conventional mm Wave orthogonal multiple access (mm Wave-OMA) system.
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