Patent ID: 8761283

Claim:
A method, comprising: (a) determining channel state information (CSI) of a multiple-input multiple-output (MIMO) channel by a receiver in a Orthogonal Frequency Division Multiplexing (OFDM) communication system, wherein the MIMO channel comprises L frequency tones, and wherein the CSI comprises L channel response matrices, each matrix corresponds to an OFDM tone; (b) decomposing each channel response matrix into a first CSI component and a second CSI component; (c) determining a first subset of the first CSI component based on a first tone group size N G1 and a second subset of the second CSI component based on a second tone group size N G2 ; and (d) transmitting the determined subsets of the first and the second CSI components to a transmitter; wherein the first CSI component comprises a plurality of unitary right eigenvector matrices V, the second CSI component comprises a plurality of diagonal singular value matrices Σ, and the determining in (c) involves determining one Σ matrix for every N G2 OFDM tones.