用于MmWave通信的具有部分信道状态信息的低复杂度角域MIMO NOMA系统 *
Low-Complexity Angle-Domain MIMO NOMA System with partial channel state information for MmWave Communications *
摘要：
在毫米波通信中，仅基于用户方向的数字波束控制（DBS）技术是一种很有前途的角域多天线技术，可以有效地抑制严重的路径损耗和多用户干扰，具有低复杂度和部分信道状态信息（CSI）的优点。在本文中，我们设计了一个功率域非正交多址（NOMA）方案，提高DBS性能权衡复杂度，能量消耗和容量性能。特别是，我们提出了一个用户聚类算法配对用户，基于几何干扰度量，使用户间的干扰减少。然后，基于固定的簇间功率分配，我们推导出一个次优的簇内功率分配优化问题，以最大化网络吞吐量。为了解决部分CSI的问题，我们通过仅依赖于用户方向来重写上述优化问题。基于美国纽约大学毫米波模拟器，在农村环境下对所提出的方案进行了性能评估。所得到的结果表明，所提出的低复杂度NOMA-DBS计划，无论是完全或部分CSI实现显着的性能改善，在经典的DBS，在频谱和能量效率（高达26.8%bps/Hz的速率增益为45个用户使用所提出的计划与部分CSI）。
英文摘要：
In millimeter-wave communication, digital beamsteering (DBS), only based on the user direction, is a promising angle-domain multi-antenna technique to mitigate the severe path loss and multiuser interference, with low-complexity and partial channel state information (CSI). In this paper, we design a power-domain non-orthogonal multiple access (NOMA) scheme that enhances the DBS performance trading-off complexity , energy-consumption and capacity performance. In particular, we propose a user-clustering algorithm to pair users, based on a geometric-interference metric, so that the inter-user interference is reduced. Afterward, based on a fixed inter-cluster power allocation, we derive analytically a sub-optimal intra-cluster power allocation optimization problem to maximize the network throughput. To address the issue of partial CSI, we rewrite the aforementioned optimization problem, by relying only on the user direction. Performance evaluation of the proposed schemes is developed in rural environment, based on the New York University millimeter-wave simulator. The obtained results demonstrate that the proposed low-complexity NOMA-DBS schemes with either full-or partial-CSI achieve significant performance improvement over the classical DBS, in terms of spectral-and energy-efficiencies (up to 26.8% bps/Hz rate gain for 45 users using the proposed scheme with partial CSI).
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