Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (10): 30-35.doi: 10.3969/j.issn.1000-565X.2010.10.006

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

Quantified Feedback Preprocessing of MIMO-OFDM Systems

Zhou Dong-yue  Hu Bin-jie   

  1. School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2010-01-06 Revised:2010-03-28 Online:2010-10-25 Published:2010-10-25
  • Contact: 周冬跃（1975-），男，博士生，主要从事MIMO预编码研究． E-mail:zhoudongyue@126．com
  • About author:周冬跃（1975-），男，博士生，主要从事MIMO预编码研究．
  • Supported by:

    国家自然科学基金资助项目（10976010）; 国家科技重大专项（20092X03006-003）; 广东省科技计划项目（2009A080207006 2009A080207002）

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Abstract:

In order to reduce the feedback bits of MIMO-OFDM preprocessing systems,a new limited feedback preprocessing scheme,which includes downlink quantified power distribution coefficients and quantified diversity weight vectors,is proposed based on the spatial diversity of MIMO-OFDM systems.In this scheme,the power distribution of sub-carriers is uniformly quantified by the receiver with a low complexity and the preprocessing diversity vectors are quantified via joint interpolation optimization.Then,the limited bits of quantified power distribution and vector information are fed back to the transmitter,and the quantitative information obtained from the feedback is used by the transmitter to restore the preprocessed power allocation and vector through interpolation.Simulated results show that the proposed scheme considerably improves the BER（Bit Error Rate） performance of the system.

Key words: orthogonal frequency division multiplexing, preprocessing, limited feedback, quantification, space diversity