面向大规模MIMO下行多用户迫零预编码的交替训练研究  

Research on interleaved training for massive MIMO downlink with multi-user zero-forcing precoding

作　　者：张铖[1,2] 丁敏捷 刘畅 Yindi Jing[3] 俞菲 黄永明[1,2] ZHANG Cheng;DING Minjie;LIU Chang;Yindi Jing;YU Fei;HUANG Yongming(National Mobile Communication Research Laboratory,Southeast University,Nanjing 210096,China;Purple Mountain Laboratories,Nanjing 211111,China;Department of Electrical and Computer Engineering,University of Alberta,Edmonton T6G1H9,Canada)

机构地区：[1]东南大学移动通信全国重点实验室,江苏南京210096 [2]网络通信与安全紫金山实验室,江苏南京211111 [3]阿尔伯塔大学电气与计算机工程系,埃德蒙顿T6G1H9

出　　处：《通信学报》2023年第9期58-69,共12页Journal on Communications

基　　金：国家自然科学基金资助项目(No.62271140,No.62225107);国家重点研发计划基金资助项目(No.2018YFB1800801);中央高校基本科研专项资金资助项目(No.2242022k60002)。

摘　　要：为解决频分双工大规模MIMO的信道获取开销问题,针对服务质量保障与基站采用迫零(ZF)预编码的典型场景,引入对信干噪比(SINR)的监督机制,设计多用户逐根天线交替训练方案。进而考虑交替训练引入的时间开销,设计基于天线分组的多用户交替训练方案。然后推导了2种方案的平均训练长度、传输成功率以及平均有效和频谱效率闭合表达式。理论与仿真揭示了发射功率、SINR阈值、用户数、分组长度与信道误差水平等参数的影响,并证明相比全训练与部分训练,所提方案可显著降低导频开销,提升传输成功率。To solve the channel acquisition overhead problem of frequency division duplex massive MIMO,for the typical scenario of zero-forcing(ZF)precoding at the base station with users’quality of service guarantee,a supervisory mechanism for the signal-to-interference-and-noise ratio(SINR)was introduced,and a multi-user antenna-by-antenna interleaved training scheme was designed.Then,considering the additional time overhead introduced by the interleaved training,a multi-user interleaved training scheme based on antenna grouping was designed.Closed-form expressions of the average training length,transmission success rate,and average effective sum spectrum efficiency were derived for the proposed schemes.Theoretical and simulation results reveal the impact of transmit power,SINR threshold,user number,group length,and the error level of channel on the performance of the proposed schemes,and demonstrate that the proposed schemes significantly reduce the pilot overhead and improve the transmission success rate compared to the full and partial training.

关 键 词：大规模MIMO 多用户 信道获取 迫零预编码 交替训练 

分 类 号：TN92[电子电信—通信与信息系统]