Patent ID: 8724445

Claim:
A method comprising, within an available spectral resource: transmitting with OFDM (orthogonal frequency division multiplexing) on selected transmission resources comprising selected sub-carriers and selected OFDM transmission durations; transmitting with T-OFDM (transformed OFDM) or direct multiple sub-carrier multiplexing on selected transmission resources comprising selected sub-carriers and selected OFDM transmission durations that do not overlap with the selected transmission resources of OFDM transmissions; wherein said transmitting with OFDM and transmitting with T-OFDM comprise: transmitting a respective signal from each of a plurality of antennas, each signal comprising at least one of OFDM and T-OFDM, wherein said transmitting a respective signal from each of the plurality of antennas uses common frequency resources for at least two of the antennas, such that MIMO processing will be required to separate the signals upon receipt.