基于SLNR与矢量扰动的毫米波大规模MIMO双层混合预编码算法  

A Dual-Layer Hybrid Precoding Algorithm Based on SLNR and Vector Perturbation for Millimeter-Wave Massive MIMO

作　　者：廖勇[1] 杜洁汝 杨馨怡 LIAO Yong;DU Jie-ru;YANG Xin-yi(School of Microelectronics and Communication Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学微电子与通信工程学院,重庆400044

出　　处：《电子学报》2023年第10期2844-2854,共11页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61501066);重庆市自然科学基金项目(No.cstc2019jcyj-msxmX0017)。

摘　　要：在多用户毫米波大规模多入多出(Multiple Input Multiple Output,MIMO)系统中,针对现有基于信漏噪比(Signal-to-Leakage-plus-Noise Ratio,SLNR)准则的混合预编码算法未考虑用户信道质量不同和信道矩阵具有病态性的问题,本文提出了一种联合SLNR与矢量扰动(Vector Perturbation,VP)的双层混合预编码算法.该算法分两层设计预编码矩阵.第一层,考虑用户信道质量不同,提出了基于SLNR准则的匹配加权算法.该算法充分考虑信道系数、预编码矢量和组合矢量的影响设计信道加权因子,利用加权因子对SLNR算法进行改进,从而设计更优的混合预编码器,消除用户间干扰.第二层,根据第一层获取到的等效基带信道,利用迫零(Zero Force,ZF)消除用户天线间干扰.考虑到信道矩阵具有病态性,采用VP算法进一步处理.通过在发射信号上添加扰动矢量减小发射端功率增强的影响.仿真结果表明,相较于同类混合预编码算法,所提算法可以获取更好的误码率(Bit Error Rate,BER)性能和频谱效率.In a multi-user millimeter wave massive multiple input multiple output(MIMO)system,aiming at the ex⁃isting signal-to-leakage-plus-noise ratio(SLNR)-based hybrid precoding algorithm that do not take into account the prob⁃lems of different user channel quality and ill-conditioned channel matrix,a dual-layer hybrid precoding algorithm that com⁃bines SLNR and vector perturbation(VP)is proposed.The algorithm designs the precoding matrix in two layers.In the first layer,considering the different user channel quality,a matching weighting algorithm based on the SLNR is proposed.The algorithm considers the influence of channel coefficients,precoder vectors and combiner vectors simultaneously to de⁃sign channel weighting factors.The weighting factors are used to improve the SLNR algorithm and design a better hybrid precoder to eliminate inter-user interference.In the second layer,according to the equivalent baseband channel obtained from the first layer,zero force(ZF)is used to eliminate the interference between antennas.Considering the ill-conditioned channel matrix,VP algorithm is used for further processing.The perturbation vector is reduced to the transmit signal to compensate the influence of the increase of transmit power.Simulation results show the proposed algorithm has better bit error rate(BER)and spectrum efficiency than similar hybrid precoding algorithms.

关 键 词：毫米波大规模MIMO 混合预编码 信漏噪比 信道质量 病态信道矩阵 矢量扰动 

分 类 号：TN929.5[电子电信—通信与信息系统]