Patent ID: 8396147
Filing Date: 2013-03-12
Classification: H04B,H04L,H04W

Abstract:
1. A multiple-input-multiple output (MIMO;) transmitter for transmitting a group of sequential orthogonal frequency division multiplexed (OFDM) symbols on a channel using a plurality of antennas comprising: subcarrier modulators to individually modulate groups of OFDM subcarriers in accordance with spatial-frequency subcarrier modulation assignments to generate groups of symbol-modulated subcarriers; logic to combine corresponding symbol-modulated subcarriers for transmission on each of a plurality of spatial channels, the spatial channels being non-orthogonal and having different multipath characteristics; and a beamformer to perform beamforming on the combined symbol-modulated subcarriers for transmission over the spatial channels, wherein the channel comprises a plurality of the groups of the OFDM subcarriers, wherein the OFDM subcarriers within each group of subcarriers and within each group of sequential OFDM symbols have the same spatial-frequency subcarrier modulation assignments, and wherein the spatial-frequency subcarrier modulation assignments for each group are determined based on feedback by a receiver, the feedback determined from spatial channel characteristics of the spatial channels.