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Method and arrangement in a wireless communication system

  • US 8,989,062 B2
  • Filed: 05/04/2010
  • Issued: 03/24/2015
  • Est. Priority Date: 05/04/2010
  • Status: Active Grant
First Claim
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1. A method in a base station for sending data to a user equipment, wherein the base station includes an instance of a codebook corresponding to another instance of the codebook in the user equipment, and the method comprises:

  • obtaining channel state information from a signal received from the user equipment;

    estimating a channel to be used for transmitting data to the user equipment;

    calculating a non-codebook based precoder, based on the obtained channel state information;

    selecting a precoding index from the codebook based on the calculated non-codebook based precoder;

    precoding data to be transmitted to the user equipment using the calculated non-codebook based precoder; and

    transmitting the precoded data, non-user dedicated reference signals and the precoding index on the estimated channel to the user equipment.

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