High Energy Efficiency Dynamic Connected Hybrid Precoding for mm Wave Massive MIMO Systems  

作　　者：Du Ruiyan Liu Huajing Li Tiangui Liu Fulai 

机构地区：[1]Lab of Key Technology of Millimeter-wave Large-scale MIMO System,Northeastern University at Qinhuangdao,Qinhuangdao,066004,China [2]School of Computer Science and Engineering,Northeastern University,Shenyang 110819,China

出　　处：《China Communications》2024年第5期36-44,共9页中国通信（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.61971117);the Natural Science Foundation of Hebei Province(Grant No.F2020501007);the S&T Program of Hebei(No.22377717D)。

摘　　要：This paper considers a high energy efficiency dynamic connected(HEDC)structure,which promotes the practicability and reduces the power consumption of hybrid precoding system by lowresolution phase shifters(PSs).Based on the proposed structure,a new hybrid precoding algorithm is presented to optimize the energy efficiency,namely,HP-HEDC algorithm.Firstly,via a new defined effective optimal precoding matrix,the problem of optimizing the analog switch precoding matrix is formulated as a sparse representation problem.Thus,the optimal analog switch precoding matrix can be readily obtained by the branch-and-bound method.Then,the digital precoding matrix optimization problem is modeled as a dictionary update problem and solved by the method of optimal direction(MOD).Finally,the diagonal entries of the analog PS precoding matrix are optimized by exhaustive search independently since PS and antenna is one-to-one.Simulation results show that the HEDC structure enjoys low power consumption and satisfactory spectral efficiency.The proposed algorithm presents at least 50%energy efficiency improvement compared with other algorithms when the PS resolution is set as 3-bit.

关 键 词：energy efficiency hybrid precoding mmWave optimized resolution phase shifter 

分 类 号：TN929.5[电子电信—通信与信息系统]