Patent ID: 8705638

Claim:
A method for signal transmission, comprising: a user equipment (UE) calculating a mean squared error (MSE) of a first layer of signal and an MSE of a second layer of signal; the UE selecting a pre-coding matrix from a plurality of pre-coding matrices according to the sum of the MSE of the first layer of signal and the MSE of the second layer of signal; and the UE informing a base station to use the selected pre-coding matrix to transmit signals, wherein the UE selecting a pre-coding matrix from a plurality of pre-coding matrices according to the sum of the MSE of the first layer of signal and the MSE of the second layer of signal comprises: when c (i) 00 +c (i) 11 >t, the UE selecting a pre-coding matrix which enables the noise of a layer of signal with good channel to be minimized from the plurality of pre-coding matrices, wherein c (i) 00 is the MSE of the first layer of signal when using the i th pre-coding matrix, c (i) 11 is the MSE of the second layer of signal when using the i th pre-coding matrix, and t is a set threshold, wherein the UE selects a pre-coding matrix which enables the noise of a layer of signal with good channel to be minimized from the plurality of pre-coding matrices according to the formula of: i=arg min(min(c (i) 00 ,c (i) 11 )), wherein i is the index number of a pre-coding matrix, min represents taking the minimum value, arg min represents the value of i that minimizes min(c (i) 00 ,c (i) 11 ).