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基于毫米波大规模MIMO系统的混合预编码设计
钟鹏,杨龙祥,曹浩彤
0
(南京邮电大学 通信与信息工程学院,南京210003)
摘要:
大规模多输入多输出(MIMO)被认为是未来5G的关键技术之一。毫米波因其足够大的频谱带宽近来备受关注。针对部分连接结构、单用户下行链路毫米波大规模MIMO系统,提出了一种新型的混合预编码设计。利用分层设计思想,首先设计模拟预编码器,提出一种模拟预编码器算法;然后通过注水算法获得最佳数字预编码器;最后,将起始最优化问题转化为在每根天线功率分配约束下单个RF链路连接天线子阵列最优化问题,再根据迭代方法获得最佳混合预编码器。仿真结果表明,最佳混合预编码器性能接近纯数字预编码器的性能。
关键词:  5G  毫米波通信  大规模多输入多输出  混合预编码  部分连接结构
DOI:
基金项目:国家自然科学基金资助项目(61372124,61427801);江苏省研究生创新工程项目(KYCX17_0784)
Hybrid precoding design for millimeter-wave massive MIMO systems
ZHONG Peng,YANG Longxiang,CAO Haotong
(College of Telecommunications & Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)
Abstract:
Massive Multiple-Input Multiple-Output(MIMO) is recognized as one of the key technologies for the future 5G communications.Millimeter-wave(MMW) frequency band has stimulated much attention recently for enough spectrum bandwidth.This paper proposes a novel hybrid precoding design for single-user downlink MMW massive MIMO systems by using partially connected structure.According to hierarchical idea,for the analog precoder design,this paper proposes an analog precoding algorithm.Then,the optimal digital precoder is achieved by using a well-known water filling algorithm.Finally,the original optimization problem is formulated to be each transmit antenna sub-array optimization problem with the constraint of each antenna power allocation,then the optimal hybrid precoder is obtain by using iterative method.Simulation results show that the proposed optimal hybrid precoder can achieve performance close to the pure digital precoder.
Key words:  5G  millimeter-wave communication  massive multiple-input multiple-output(MIMO)  hybrid precoding  partially connected structure
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