Patent ID: 8085871
Filing Date: 2011-12-27
Classification: H04B,H04L

Abstract:
1. A method for operating a receiving Multiple Input Multiple Output (MIMO) wireless device comprising: receiving a training sequence from a transmitting MIMO wireless device; estimating a channel response (H) based upon the training sequence; determining an estimated transmitter beamforming unitary matrix (V) and a transmit path quality matrix (D) based upon the channel response (H) and a receiver beamforming unitary matrix (U); determining transmit path quality components by determining a signal to noise ratio (SNR) for each transmit path of the training sequence based upon the transmit path quality matrix (D), comprising determining a geometric mean for the SNR (SNRgeo) for each of the transmit paths of the training sequence over sub carriers of an OFDM (orthogonal frequency division multiplex) frame of the training sequence, where SNRgeo=prod(1+SNRi)1/N−1, where SNRi is the signal to noise ratio of the i sending components of the estimated transmitter beamforming unitary matrix (V) and the signal to noise ratio (SNR) components determined based upon the transmit path quality matrix (D) to the transmitting MIMO wireless device; and receiving a data frame from the transmitting MIMO wireless device, wherein the data frame comprises: