Patent ID: 8170131
Filing Date: 2012-05-01
Classification: H04B,H04L

Abstract:
1. A method of reducing feedback data in a communication system, said communication system comprising a number of transmitter antennas, n T , and a number of receiver antennas, n R , for parallel spatially independent transmission and reception of signals, wherein a channel response is represented by a matrix (G) containing n R ×n T complex variables, the method comprising the steps of: decomposing by a data processing device, an expression of said channel response matrix (G) into products of a unitary transform (V), n choosing said unitary matrix (W) such that its diagonal elements are real, substituting said channel response matrix (G) with a representative subset of elements in said decomposed expression of said channel response matrix (G), said representative subset comprising diagonal elements of a first matrix ({tilde over (Λ)}) and lower triangle elements of a second matrix ({tilde over (W)}) excluding diagonal elements.