Parameterized codebook subsets for use with precoding MIMO transmissions

  • US 10,291,302 B2
  • Filed: 05/28/2014
  • Issued: 05/14/2019
  • Est. Priority Date: 04/07/2010
  • Status: Active Grant
First Claim
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1. A method in a second wireless communication transceiver of providing precoder selection feedback to a first wireless communication transceiver as precoding information for said first transceiver, said method comprising:

  • determining channel conditions at the second transceiver;

    determining to operate in a first feedback mode when a first physical transmission channel is used to send the precoder selection feedback and in a second feedback mode when a second physical transmission channel is used to send the precoder selection feedback;

    when operating in the first feedback mode, selecting a precoder from a predetermined set of precoders based on said channel conditions, and sending a full-range index value, with the ability to indicate any of the precoders in the predetermined set, for the selected precoder to said first transceiver as said precoder selection feedback;

    when operating in the second feedback mode, selecting a precoder from a smaller, predetermined subset of precoders contained within the predetermined set of precoders based on said channel conditions, and sending a smaller-range index value, with the ability to only indicate precoders within the predetermined subset of precoders, for the selected precoder to said first transceiver as said precoder selection feedback; and

    using a smaller signaling payload for sending smaller-range index values as compared to the signaling payload used to send full-range index values.

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