中国邮电高校学报(英文) ›› 2010, Vol. 17 ›› Issue (6): 53-58.doi: 10.1016/S1005-8885(09)60525-2

• Wireless • 上一篇    下一篇

Practical robust uniform channel decomposition scheme for CSI mismatch in limited feedback MIMO systems

陈睿1,李建东2,刘伟3   

  1. Information Science Institute, State Key Laboratory of Integrated Service Networks, Xidian University, Xi’an 710071, China
  • 收稿日期:2010-04-06 修回日期:2010-07-14 出版日期:2010-12-30 发布日期:2010-12-06
  • 通讯作者: 陈睿 E-mail: rchenxidian@gmail.com
  • 基金资助:

    国家杰出青年科学基金;国家重点基础研究发展计划(973计划)课题;长江学者和创新团队发展计划资助;863计划课题和国家自然科学基金项目

Practical robust uniform channel decomposition scheme for CSI mismatch in limited feedback MIMO systems

  1. Information Science Institute, State Key Laboratory of Integrated Service Networks, Xidian University, Xi’an 710071, China
  • Received:2010-04-06 Revised:2010-07-14 Online:2010-12-30 Published:2010-12-06
  • Supported by:

    National Natural Science Foundation for Distinguished Young Scholar;the National High Technology Research and Development Program of China

摘要:

Uniform channel decomposition (UCD) has been proven to be optimal in bit error rate (BER) performance and strictly capacity lossless when perfect channel state information (CSI) is assumed to be available at both the transmitter and receiver side. In practice, CSI can be obtained by channel estimation at receiver and conveyed to transmitter via a limited-rate feedback channel. In such case, the implementation of traditional UCD by treating the imperfect CSI as perfect CSI cause significant performance degradation due to inevitable channel estimation error and vector quantization error. To overcome this problem, a practical robust UCD scheme was proposed in this paper, which includes two steps, firstly, a matching architecture was proposed to eliminate the mismatch between CSI at receiver (CSIR) and CSI at transmitter (CSIT), secondly, an MMSE based robust UCD scheme considering channel estimation error and vector quantization error as an integral part of the design was derived. Simulation results show that the proposed practical robust UCD scheme is capable of improving the BER performance greatly in the context of channel estimation error and vector quantization error compared with the traditional UCD scheme.

关键词:

multi-input multi-output (MIMO), geometric mean decomposition (GMD), UCD, robust design, limited feedback

Abstract:

Uniform channel decomposition (UCD) has been proven to be optimal in bit error rate (BER) performance and strictly capacity lossless when perfect channel state information (CSI) is assumed to be available at both the transmitter and receiver side. In practice, CSI can be obtained by channel estimation at receiver and conveyed to transmitter via a limited-rate feedback channel. In such case, the implementation of traditional UCD by treating the imperfect CSI as perfect CSI cause significant performance degradation due to inevitable channel estimation error and vector quantization error. To overcome this problem, a practical robust UCD scheme was proposed in this paper, which includes two steps, firstly, a matching architecture was proposed to eliminate the mismatch between CSI at receiver (CSIR) and CSI at transmitter (CSIT), secondly, an MMSE based robust UCD scheme considering channel estimation error and vector quantization error as an integral part of the design was derived. Simulation results show that the proposed practical robust UCD scheme is capable of improving the BER performance greatly in the context of channel estimation error and vector quantization error compared with the traditional UCD scheme.

Key words:

multi-input multi-output (MIMO), geometric mean decomposition (GMD), UCD, robust design, limited feedback