基于延迟输出反馈的上行多小区MIMO蜂窝干扰网络自由度分析  

Degrees of Freedom of Uplink Multi-cell MIMO CellularInterfering Network with Delayed Output Feedback

作　　者：张博为 冯文江[2] 廖勇[4,3] 蒋卫恒 刘国岭[2] 应腾达 

机构地区：[1]国网重庆市电力公司信息通信分公司，重庆400012 [2]重庆大学通信工程学院，重庆400044 [3]西安电子科技大学综合业务网理论及关键技术国家重点实验室，重庆400044 [4]重庆大学通信与测控中心，陕西西安710071

出　　处：《电子学报》2017年第12期3051-3059,共9页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61501066);重庆市基础与前沿研究计划项目(No.cstc2015jcyjA40003;No.cstc2016jcyjA0209);西安电子科技大学综合业务网理论及关键技术国家重点实验室开放基金(No.ISN16-03);重庆大学中央高校基本科研业务费项目(No.106112016CDJXY500002;No.106112017CDJXY500001)

摘　　要：针对具有反馈时延的上行多小区MIMO(Multiple-Input Multiple-Output)蜂窝干扰网络,提出一种基于延迟输出反馈(OF,Output Feedback)的回溯干扰重构(RIR,Retrospective Interference Reconstruction)方案.该方案首先通过在基站构造接收波束成形矩阵,将重构的OF下传至用户.然后用户对延迟的OF预编码并传输至基站,基站利用预编码信息消除小区间干扰.分析了上行任意多小区MIMO蜂窝干扰网络的RIR方案适用条件、系统和速率和可达自由度(Do F,Degrees of Freedom),并将RIR方案与回溯干扰对齐方案和TDMA方案进行对比仿真分析,结果表明,RIR方案能获得更多自由度.A retrospective interference reconstruction（ RIR） scheme was proposed for the uplink multi-cell multipleinput multiple-output（ MIMO） cellular interfering network with delayed feedback. The main idea of RIR is to eliminate the inter-cell interference based on the delayed output feedback（ OF）. The received beamforming matrix is used to reconstruct the interference signal at each base station（ BS）. Each BS feeds the reconstructed OF back to its corresponding user. Subsequently,the corresponding user for each BS utilizes the delayed OF to precode information and sends the precoding information to its served BS. The precoding information is used to eliminate all interference signals at each BS. The achievable degrees of freedom（ DoF）, the achievable sum rate and the application conditions of RIR scheme were analyzed for the uplink multi-cell MIMO cellular interfering network with arbitrary number of cells. Experiment results show that the RIR scheme can provide significant DoF gain over the time division multiple access（ TDMA） and the existing retrospective interference alignment schemes.

关 键 词：MULTIPLE-INPUT multiple-output(MIMO) 蜂窝干扰网络 输出反馈 自由度 回溯干扰对齐 

分 类 号：TN911.72[电子电信—通信与信息系统]