A Coherent PMI Estimation Scheme for Double Codebook

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• 作者：Dan Wang (1) (2)
  Yong Liao (3)
  Yu Liu (2)
  
  1. College of Communication Engineering ; Chongqing University of Posts and Telecommunication ; Chongqing ; People鈥檚 Republic of China
  2. College of Communication Engineering ; Chongqing University ; Chongqing ; People鈥檚 Republic of China
  3. Center of Communication and Tracking Telemetering Command ; Chongqing University ; Chongqing ; People鈥檚 Republic of China
  
• 关键词：PMI (precoding matrix indicators) ; Double codebook ; LTE ; A
• 刊名：International Journal of Wireless Information Networks
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：22
• 期：1
• 页码：67-72
• 全文大小：548 KB
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• 刊物类别：Engineering
• 刊物主题：Electronic and Computer Engineering
  
• 出版者：Springer Netherlands
• ISSN：1572-8129

文摘

The double codebook structures are proposed and applied in LTE-advanced, which can track both long-term and short-term channel state information. In traditional incoherent estimation, precoding matrix indicators (PMI) estimation is performed on each individual subcarrier and some form of averaging procedure then follows to combine the results from individual narrow-band processing. As a result, if there is a large deviation in any estimates of a subcarrier, it will lead to a larger deviation in the final result. Thus incoherent PMI estimation has a poor performance in low signal to noise ratio. This paper introduces a new PMI feedback scheme for wideband sources with coherent signal subspace method. This new technique estimates PMI based on an approximately coherent combination of each subcarrier by a focusing matrix. Simulation results show that the coherent estimation scheme has a better throughput performance than the traditional incoherent estimation.