Hybrid precoding with phase shifter reduction for 5G massive antenna multi-user systems in millimetre wave
Hybrid precoding with phase shifter reduction for 5G massive antenna multi-user systems in millimetre wave
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DOI：
10.1049/iet-com.2018.5920
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发表时间：
2019-10
期刊：
影响因子：
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通讯作者：
Xiongwen Zhao;Yu Zhang;S. Geng;Fei Du;Zihao Fu;Zhenyu Zhou
中科院分区：
文献类型：
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作者：
Xiongwen Zhao;Yu Zhang;S. Geng;Fei Du;Zihao Fu;Zhenyu Zhou
在这项研究中，常用的预编码方案的性能是基于在火车站进行的28 GHz的信道测量来评估的，用于大规模天线系统配置。提出了一种适用于第五代(5G)多用户天线系统的混合预编码算法，并基于实际测量的信道对其性能进行了评估。具体地，推导了PZF算法的可达和速率的上界，并提出了一种减少移相器(PSS)的预编码技术--简化PZF(RPZF)，该技术可以显著降低混合预编码系统的功耗。此外，还给出了使用RPZF时可达和速率的闭合表达式。作者提出的方案没有复杂的矩阵分解和优化技术的要求。仿真结果表明，在视距(LOS)和非视距(LOS)情况下，使用该混合预编码器可以分别降低30%和50%的PSS。此外，3位低分辨率的数字PSS也可以达到与模拟PSS类似的性能。
In this study, the performances of commonly used precoding schemes are evaluated based on channel measurements carried out at 28 GHz in a railway station for a massive antenna system configuration. And a hybrid precoding algorithm for a fifth generation (5G) multi-user antenna system is proposed and its performance is evaluated based on real measured channels. Specifically, An upper bound for achievable sum-rate of phased zero forcing (PZF) algorithm is derived and a precoding technique by reduction of phase shifters (PSs) named reduced-PZF (RPZF) is proposed, which can obviously reduce power consumption in hybrid precoding systems. In addition, the authors give the closed-form expression for achievable sum-rate when RPZF is used. There are no requirements in the authors’ proposed scheme with complicated matrix decomposition and optimisation techniques. The simulation results show that it is possible to reduce 30 and 50% of the PSs by using the proposed hybrid precoder with better system performance in the line-of-sight (LoS) and non-LoS scenarios, respectively. In addition, the digital PSs with 3 bits low resolution can achieve the similar performance when using analogue ones.