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A Coherent PMI Estimation Scheme for Double Codebook

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Abstract

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.

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Acknowledgments

This work is partially supported by the Fundamental Research Funds for the Central Universities No. 106112014CDJZR165505 and 106112013CDJZR160015.

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Authors and Affiliations

  1. College of Communication Engineering, Chongqing University of Posts and Telecommunication, Chongqing, People’s Republic of China

    Dan Wang

  2. College of Communication Engineering, Chongqing University, Chongqing, People’s Republic of China

    Dan Wang & Yu Liu

  3. Center of Communication and Tracking Telemetering Command, Chongqing University, Chongqing, People’s Republic of China

    Yong Liao

Authors
  1. Dan Wang
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  2. Yong Liao
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  3. Yu Liu
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Correspondence to Dan Wang.

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Wang, D., Liao, Y. & Liu, Y. A Coherent PMI Estimation Scheme for Double Codebook. Int J Wireless Inf Networks 22, 67–72 (2015). https://doi.org/10.1007/s10776-014-0257-5

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  • DOI: https://doi.org/10.1007/s10776-014-0257-5

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