METHOD AND APPARATUS FOR DETERMINING PRECODING MATRIX INDICATOR, USER EQUIPMENT, AND BASE STATION

摘要

A method and an apparatus determine a precoding matrix indicator, user equipment, and a base station. The method includes: determining a precoding matrix indicator PMI, where the PMI corresponds to a precoding matrix W, and the precoding matrix W satisfies a first condition, a second condition, or a third condition; and sending the PMI to a base station. Embodiments of the present invention further provide a corresponding apparatus, and the corresponding user equipment and base station. Technical solutions provided in the embodiments of the present invention can effectively control a beam, especially a beam shape and a beam orientation, in a horizontal direction and a perpendicular direction.

主权项

1. A method for determining a precoding matrix indicator, comprising:
determining a precoding matrix indicator PMI, wherein the PMI corresponds to a precoding matrix W, and the precoding matrix W satisfies a first condition, a second condition, or a third condition; and sending the PMI to a base station, wherein the first condition is that the precoding matrix W satisfies W=DV, wherein the matrix D is a diagonal matrix, D=α·diag{u1,u2, . . . , un,u*n,u*n-1, . . . , u*1}, α is a complex factor, a complex number u*i is a conjugate complex number of a complex number ui, and n is determined by a quantity of antenna ports; and the matrix V is a constant modulus matrix; the second condition is that the precoding matrix W comprises one or more column vectors of a block diagonal matrix W1, or the precoding matrix W is obtained by performing weighted combination on one or more column vectors of a block diagonal matrix W1, wherein W1=diag{X1, . . . , XNB}, and NB≧1, wherein at least one block matrix X is a product X=DV of a matrix D and a matrix V, and X∈{X1,X2, . . . , XNB}; the matrix D is a diagonal matrix, D=α·diag{u1,u2, . . . , un,u*n,u*n-1, . . . , u*1}, α is a complex factor, a complex number u*i is a conjugate complex number of a complex number ui, and n is determined by a quantity of antenna ports; and the matrix V is a constant modulus matrix; and the third condition is that the precoding matrix W comprises one or more column vectors of a block diagonal matrix W1, or the precoding matrix W is obtained by performing weighted combination on one or more column vectors of a block diagonal matrix W1, wherein W1=diag{X1, . . . , XNB}, and NB≧1, wherein at least one block matrix X is a Kronecker product of a matrix A and a matrix B, X=A{circle around (×)}B, and X∈{X1,X2, . . . , XNB}; the matrix A or the matrix B is a product of a matrix D and a matrix V; the matrix D is a diagonal matrix, D=α·diag{u1,u2, . . . , un,u*n,u*n-1, . . . , u*1}, α is a complex factor, a complex number u*i is a conjugate complex number of a complex number ui, i=1, . . . , n , and n is a quantity of rows of the matrix A or the matrix B ; and the matrix V is a constant modulus matrix.