Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (5): 9-15.doi: 10.3969/j.issn.1000-565X.2014.05.002

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

CSI Quantization and Analysis for Wireless Coordinated Multi- Point System Under Non- Ideal Backhaul Constraint

Zhou Fa- sheng Du Ming- hui Zhan Qi- cong Liang Ya- ling   

  1. School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2013-11-14 Revised:2014-03-24 Online:2014-05-25 Published:2014-04-01
  • Contact: 杜明辉(1964-)，男，教授，博士生导师，主要从事信号处理研究． E-mail:eemhdu@scut.edu.cn
  • About author:周发升(1974-)，男，博士生，主要从事无线协作通信、协作多点、小蜂窝网络研究．E-mail:zhou．fs@mail．scut．edu．cn
  • Supported by:

    国家自然科学基金资助项目(60972133);广东省自然科学基金团队项目(9351064101000003)

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Abstract:

Coordinated multi- point (CoMP) system has been applied to the 4th generation wireless communicationnetwork LTE- A and beyond networks to accommodate ever- growing need for system capacity and diversity.It is par-ticularly suitable for cell- edges.However,there exists bandwidth limit and transmission delay in the non- idealbackhauls of LTE- A CoMP system,which results in imperfect CSI (Channel State Information) feedback from userequipment to base stations and further causes the degradation of CoMP performance.In order to solve this problem,a CSI quantization method on the basis of Grassmann manifold theory is proposed.With this method,an optimalcode book can be obtained to reduce the CSI feedback overhead.Both mathematical analysis and simulation showthat the proposed method helps improve the CoMP performance under non- ideal backhaul constraint.

Key words: cooperative communication, coordinated multi- point system, backhaul, quantization, system capacity, diversity