Patent ID: 7885346

Claim:
A multiple-input-multiple output (MIMO) transmitter for transmitting a group of sequential orthogonal frequency division multiplexed (OFDM) symbols on a time-division duplexed (TDD) channel using a plurality of antennas comprising: a spatial-frequency parser to parse a block of bits into spatial-frequency blocks of a variable number of coded bits; subcarrier modulators to individually modulate OFDM subcarriers with the spatial-frequency blocks in accordance with spatial-frequency subcarrier modulation assignments to generate groups of symbol-modulated subcarriers; and circuitry to combine the groups of symbol-modulated subcarriers for transmission on each of a plurality of spatial channels, the spatial channels being non-orthogonal and having different multipath characteristics, wherein the TDD channel comprises a plurality of the groups of the OFDM subcarriers, and 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.