基于混合波束赋形的室内毫米波MIMO系统性能分析

摘要

Hybrid beamforming increases data rate through digital beamforming in baseband and analog beamforming in radio frequency.In order to analyze the capacity of indoor millimeter wave multiple input multiple output (MIMO) system based on hybrid beamforming,we investigate the zero force (ZF) receiver,the minimum mean square error (MMSE) receiver,and the matched filter (MF) receiver to obtain the data rate of the system under the optimal codebook-based beam selection in different circumstances.Simulation results show that whether the line-of-sight path is blocked,both the MMSE receiver and the ZF receiver achieve the performance which is close to the capacity under high total transmit power;under low total transmit power,the performance of the MMSE receiver is slightly better than the ZF receiver.However,the MF receiver shows poor performance.The system could adopt suitable receiver according to total transmit power and the complexity of receiver.The practical indoor wireless personal area networks (WPAN) could achieve high data rate short-distance wireless communications by applying the system we investigated in this paper.%混合波束赋形在射频模拟域波束赋形的基础上,通过在基带实现数字域波束赋形来进一步提高数据速率.本文针对基于混合波束赋形的室内毫米波MIMO(Multiple Input Multiple Output)系统进行性能分析,分别评估了迫零(Zero Force,ZF)接收机、最小均方误差(Minimum Mean Square Error,MMSE)接收机以及匹配滤波(Matched Filter,MF)接收机在基于码本的最优波束选择下的传输速率,并对接收机在不同的信道环境下进行性能评估.仿真结果表明,无论视距(Line-Of-Sight,LOS)传播路径是否被遮挡,MMSE接收机和ZF接收机在总发射功率较高时均具有接近容量的性能;在总发射功率较低时MMSE接收机的性能则略优于ZF接收机.相反,MF接收机始终保持较差的性能.系统可根据总发射功率大小以及接收机的实现复杂度来选取合适的接收机.本文所研究的系统可应用于实际室内无线个域网(Wireless Personal Area Networks,WPAN)以实现高速短距无线通信.