Beamspace MIMO-NOMA for Millimeter-Wave Communications Using Lens Antenna Arrays

2017 IEEE 86th Vehicular Technology Conference (VTC-Fall) Pub Date : 2017-09-01 DOI:10.1109/VTCFall.2017.8288345

Bichai Wang, L. Dai, Xiqi Gao, L. Hanzo

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引用次数: 22

Abstract

The recent concept of beamspace multiple-input multiple-output (MIMO) is capable of significantly reducing the number of radio-frequency (RF) chains required by millimeter-wave (mmWave) massive MIMO systems. However, the fundamental limit of the existing beamspace MIMO is that, the number of supported users cannot be higher than the number of RF chains using the same time-frequency resources. To break this limit, beamspace MIMO is integrated with non-orthogonal multiple access (NOMA) in the proposed MIMO-NOMA system in this paper, where the number of supported users can be higher than the number of RF chains. To reduce the inter-beam interference, a transmit precoding (TPC) scheme based on the principle of zero-forcing (ZF) is designed. Furthermore, a dynamic power allocation scheme is proposed for maximizing the achievable sum rate. Moreover, a low-complexity iterative optimization algorithm is conceived for dynamic power allocation. Simulation results show that the proposed beamspace MIMO-NOMA achieves a higher spectrum and energy efficiency than the existing beamspace MIMO for mmWave communications.

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基于透镜天线阵列的毫米波通信波束空间MIMO-NOMA

波束空间多输入多输出(MIMO)的最新概念能够显著减少毫米波(mmWave)大规模MIMO系统所需的射频(RF)链的数量。然而，现有波束空间MIMO的基本限制是，支持的用户数量不能高于使用相同时频资源的射频链数量。为了打破这一限制，在本文提出的MIMO-NOMA系统中，将波束空间MIMO与非正交多址(NOMA)相结合，支持的用户数量可以大于射频链的数量。为了减少波束间干扰，设计了一种基于零强迫原理的传输预编码方案。在此基础上，提出了一种可实现和率最大化的动态功率分配方案。提出了一种低复杂度的动态功率分配迭代优化算法。仿真结果表明，在毫米波通信中，所提出的波束空间MIMO- noma比现有的波束空间MIMO具有更高的频谱效率和能量效率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)

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