Patent ID: 9634748
Date: 2017-04-25
CPC Classifications: H04B,H04J,H04L,H04W

Claim:
1. A method for determining a precoding matrix indicator (PMI), comprising: determining the 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; sending the PMI to a base station; and using, by the base station, the PMI for controlling a beam shape and a beam orientation in a horizontal direction and a perpendicular direction of an active antenna system, wherein the first condition is that the precoding matrix W satisfies W=DV, wherein D is a diagonal matrix, D=α·diag{u the second condition is that the precoding matrix W comprises one or more column vectors of a block diagonal matrix W the third condition is that the precoding matrix W comprises one or more column vectors of a block diagonal matrix W