Patent ID: 9590706
Date: 2017-03-07
CPC Classifications: H04B

Claim:
1. A method comprising: receiving a plurality of precoders from a codebook in a transmitter having an antenna array; transforming each precoder of the plurality of precoders using a transformation that maps each precoder to a transformed precoder such the transformed precoders generate antenna patterns with equal radiated power, where a transformation matrix for the transformation is a matrix with column vectors equal to the eigenvectors of a Hermitian and non-negative definite matrix multiplied by a diagonal matrix with the value of each diagonal element equal to the inverse of the positive square root of the eigenvalue of the corresponding eigenvector; receiving a signal for transmission; applying a transformed precoder of the plurality of transformed precoders to the signal to generate a precoded signal for transmission over a physical channel; and transmitting the precoded signal.