吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (2): 661-669.doi: 10.13229/j.cnki.jdxbgxb201702043

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信道时延条件下的CoMP系统有限反馈比特分配

叶方, 苏春霞, 李一兵, 刘君   

  1. 哈尔滨工程大学 信息与通信工程学院,哈尔滨 150001
  • 收稿日期:2015-09-25 出版日期:2017-03-20 发布日期:2017-03-20
  • 通讯作者: 李一兵(1967-),男,教授,博士生导师.研究方向:超宽带信号检测与处理,认知无线电,信息融合技术.E-mail:liyibing0920@sina.cn
  • 作者简介:叶方(1980-),女,副教授,博士.研究方向:下一代移动通信及无线技术,认知无线电.E-mail:yefang0815@sina.cn
  • 基金资助:
    国家自然科学基金项目(51509049); 黑龙江省自然科学基金项目(F201345); 中央高校基本科研业务费项目(GK2080260140); 国家重大科学仪器设备开发项目(2016YFF0102806).

Bits allocation with limited feedback considering channel delay in CoMP system

YE Fang, SU Chun-xia, LI Yi-bing, LIU Jun   

  1. College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China
  • Received:2015-09-25 Online:2017-03-20 Published:2017-03-20

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摘要： 研究了非完全信道状态信息(CSI)条件下用户终端对基站的反馈比特数问题,在考虑有限反馈和信道时延的条件下,得出系统速率损失近似上界与反馈比特数的关系表达式,基于该表达式提出一种新的反馈比特分配方案。该方案通过对系统速率损失近似上界求导处理,得到使得速率损失近似上界达到最小的最佳反馈比特数。该方案可以有效地降低有限反馈对系统速率的影响,系统速率比传统的比特均分算法高,复杂度比穷举法低。

关键词: 通信技术, 协同多点, 有限反馈, 信道时延, 比特分配, 块对角化预编码

Abstract: Cellular systems are known as interference-limited in nature. In order to meet this challenge, Coordinated Multi-Point (CoMP) transmission reception is proposed in LTE-Advanced. One of the key strategies to mitigate interference in CoMP is to design the precoding. With the perfect Channel State Information (CSI) in cooperative multi-cell systems, the intra-cell and inter-cell interference can be mitigated by Block Diagonalization (BD) precoding. However, the CSI in practical systems is imperfect, so bits allocation under imperfect SCI is considered. Closed-form expressions of the upper bound of system rate loss and the number of feedback bits are derived with limited feedback and channel delay. A new bits allocation strategy is developed based on this expression, which can minimize the rate loss by making the partial derivative of the upper bound of rate lass equal to zero. The proposed bits allocation algorithm yields higher sum-rates than equal-bits allocation algorithm, and it has lower complexity than exhaustive algorithm.

Key words: communication technology, coordinated multi-point, limited feedback, channel delay, bits allocation, block diagonalization precoding

中图分类号: 

  • TN929
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