协作多点系统和空间干扰对齐机制  

Sum-Space Interference Alignment Scheme for CoMP Systems

作　　者：牛勤[1,2] 曾志民[1,2] 张天魁[1,2] 高秋彬[3] 孙韶辉[3] 

机构地区：[1]北京邮电大学信息与通信工程学院,北京100876 [2]网络体系构建与融合北京市重点实验室,北京100876 [3]无线移动通信国家重点实验室电信科学技术研究院,北京101149

出　　处：《北京邮电大学学报》2014年第1期66-70,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家科技重大专项项目(2012ZX03001031-004);无线移动通信国家重点实验室(电信科学技术研究院)开放基金项目

摘　　要：提出了一种用于下行协作多点系统联合传输的和空间干扰对齐(IA)机制.利用多小区联合预编码将从不同基站到同一用户的干扰对齐到一个特定维度的空间中,实现干扰空间的压缩;然后在接收端设计干扰抑制矩阵消除多用户间干扰.从系统自由度(DoF)的角度理论分析了和空间IA机制的性能,给出了系统可达DoF上界,以及干扰信号压缩维度与系统可达DoF的关系.数值仿真将和空间IA机制与传统正交机制和经典IA机制进行对比,验证了和空间IA机制可以获得更高的DoF与数据速率.A sum-space interference alignment （IA） scheme for downlink coordinated multi-point joint transmission system was proposed. The interference from the collaborative base stations to each user e- quipment was aligned onto a space of specific dimension, which was accomplished by joint precoding for multiple coordinated ceils, and then the interference space was compressed. The interference can be e- liminated by interference suppression matrix which was designed at the each user equipment side. In the performance analysis, the outer bound of the system total achievable degree of freedom （DoF） was de- rived, and the relationship between the achievable DoF and the dimensions of the aligned interference space was given. Numerical analysis shows that the sum-space IA scheme can obtain more DoF and data rate compared with traditional orthogonal schemes and traditional IA schemes.

关 键 词：协作多点 联合传输 干扰对齐 自由度 

分 类 号：TN929.53[电子电信—通信与信息系统]