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Method for precoding matrix indicator feedback and apparatus

  • US 10,419,090 B2
  • Filed: 10/01/2018
  • Issued: 09/17/2019
  • Est. Priority Date: 04/01/2016
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • receiving, by a terminal device, a reference signal from a base station;

    based on the received reference signal, determining, by the terminal device, a precoding matrix W in a precoding matrix set corresponding to a rank indication, wherein W satisfies W=W1×

    W2×

    W3, W is a matrix of Nt rows and R columns, Nt is a quantity of antenna ports, R is a rank value corresponding to the rank indication, Nt is an even number and Nt is greater than or equal to R, wherein W1 is a matrix of Nt rows and 2M columns, W2 is a matrix of 2M rows and 2K columns, W3 is a matrix of 2K rows and R columns, K is less than M, wherein Nt, R, M, and K are all positive integers, M is greater than or equal to 2, none of W1, W2, and W3 is an identity matrix, and the 2M columns in W1 comprise every column in W1×

    W2, wherein a first precoding matrix indicator corresponds to the first precoding matrix W1, a second precoding matrix indicator corresponds to the second precoding matrix W2, and a third precoding matrix indicator corresponds to the third precoding matrix W3;

    sending, by the terminal device, the rank indication, the first precoding matrix indicator, the second precoding matrix indicator, and the third precoding matrix indicator to the base station; and

    receiving, by the terminal device, data which is precoded using a precoding matrix determined by the base station based on the rank indication, the first precoding matrix indicator, the second precoding matrix indicator and the third precoding matrix indicator.

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