两小区多用户蜂窝干扰网络的回溯干扰中和方案

Retrospective Interference Neutralization Scheme for the Two-Cell Multiuser Cellular Interfering Network

针对具有反馈时延的上行两小区多输入多输出蜂窝干扰网络,提出一种基于发射端混合信道状态信息（CSIT）反馈的回溯干扰中和（RIN）方案.首先,通过用户发送机制设计使基站完成边信息的获取;其次,用户利用CSIT完成预编码并传输至基站;最后,基站利用预编码信息将多个时隙的干扰叠加为零,从而完成小区间干扰的消除.给出了所提RIN方案的适用条件、系统和速率、可达自由度和仿真验证,并将所提方案与时分多址方案和回溯干扰对齐方案进行分析和仿真.仿真结果表明,所提方案能获得更多的系统自由度.

For the uplink two-cell multiple-input multiple-output cellular interfering network with delayed feedback,a retrospective interference neutralization（RIN） scheme was proposed by using hybrid channel state information at the transmitter（CSIT）. First,each user was scheduled to send fresh data streams to each base station so that each base station can obtain side information. Subsequently,each user used the hybrid CSIT to precode information and sent the precoding information to each base station. Finally,each base station eliminated all inter-cell interference by using the precoding information. The achievable degrees of freedom,the achievable sum rate,the simulation validation and the application conditions of RIN scheme were given. Experiment shows that the proposed RIN scheme can provide significant degrees of freedom gain over the time division multiple access and the existing retrospective interference alignment schemes.