17-01-2019 дата публикации
Номер: US20190020387A1
A precoding matrix indicator (PMI) is determined for a user equipment or a base station, 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 the PMI is sent to a base station. The precoding matrix indicator can effectively control a beam, especially a beam shape and a beam orientation, in a horizontal direction and a perpendicular direction. 1. A method for determining a precoding matrix indicator (PMI) , comprising:receiving, by a user equipment, a reference signal sent by a base station; anddetermining, by the user equipment, the PMI according to the reference signal, wherein the PMI corresponds to a precoding matrix W, and the precoding matrix W satisfies:{'sub': 1', '1', '1', '1', 'N', {'sub2': 'B'}, 'B', '1', '2', 'N', {'sub2': 'B'}, '1', '2', 'n', 'n', 'n−1', '1', 'i', 'i, 'the precoding matrix W comprises one or more column vectors of a block diagonal matrix W, or the precoding matrix W is obtained by performing weighted combination on one or more column vectors of a block diagonal matrix W, wherein W=diag {X, . . . ,X}, and N≥1, wherein at least one block matrix X is a Kronecker product of a matrix A and a matrix B, X=A ⊗ B, and X ε {X,X, . . . ,X}; 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 {u,u, . . . ,u,u*,u*, . . . ,u*}, α is a complex factor, a complex number u* is a conjugate complex number of a complex number u, i=1, . . . ,n, and n is a quantity of row s of the matrix A or the matrix B; and the matrix V is a constant modulus matrix;'}{'sub': 1', '2', '2', '1', '1, 'wherein in the third condition, the precoding matrix W satisfies W=WW, wherein the matrix Wis used to select one or more column vectors of the matrix W; or is used to perform weighted combination on one or more column vectors of the Wto obtain the precoding matrix W; and'}sending, by the user equipment, the PMI to the ...
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