北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2014, Vol. 37 ›› Issue (1): 66-70.doi: 10.13190/j.jbupt.2014.01.015

• 论文 • 上一篇    下一篇

协作多点系统和空间干扰对齐机制

牛勤1,2, 曾志民1,2, 张天魁1,2, 高秋彬3, 孙韶辉3   

  1. 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
  • 收稿日期:2013-05-10 出版日期:2014-02-28 发布日期:2014-01-07
  • 作者简介:牛摇勤(1985—),女,博士生,E-mail:aniunq001@bupt.edu.cn;曾志民(1956—),男,教授,博士生导师.
  • 基金资助:

    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

Sum-Space Interference Alignment Scheme for CoMP Systems

NIU Qin1,2, ZENG Zhi-min1,2, ZHANG Tian-kui1,2, GAO Qiu-bin3, SUN Shao-hui3   

  1. 1. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China;
    2. Beijing Key Laboratory of Network System Architecture and Convergence, Beijing 100876, China;
    3. State Key Laboratory of Wireless Mobile Communications, China Academy of Telecommunication Technology, Beijing 101149, China
  • Received:2013-05-10 Online:2014-02-28 Published:2014-01-07

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.

关键词: 协作多点, 联合传输, 干扰对齐, 自由度

Abstract:

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 equipment was aligned onto a space of specific dimension, which was accomplished by joint precoding for multiple coordinated cells, and then the interference space was compressed. The interference can be eliminated 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 derived, 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.

Key words: coordinated multi-point, joint transmission, interference alignment, degree of freedom

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