Orthogonal time frequency space modulation system

A communication device, comprising:

• a wireless transmitter;
• a processor;
• and
• a memory including program code executable by the processor, the program code including:
• code for causing the processor to receive a plurality of information symbols;
• code for causing the processor to create a plurality of modulation symbols by using each of the plurality information symbols to modulate one of a plurality of two-dimensional basis functions on a time-frequency plane wherein each of the plurality of two-dimensional basis functions is uniquely associated with one of the plurality of information symbols;
• code for causing the processor to generate a transmit waveform comprised of a plurality of pulse waveforms, each of the plurality of pulse waveforms corresponding to a combination of one of the plurality of modulation symbols and one of a plurality of time-translated and frequency-modulated versions of a fundamental transmit pulse;
• and
• code for causing the processor to provide the transmit waveform to the wireless transmitter.

A method, comprising:

• receiving, at a communication receiver, one or more modulated waveforms;
• matched filtering samples of the one or more modulated waveforms with respect to a receive pulse to produce estimated time-frequency modulation symbols wherein each of the estimated time-frequency modulation symbols corresponds to modulation of one of a plurality of orthogonal two-dimensional basis functions by one of a plurality of information symbols;
• and
• projecting the estimates of the time-frequency modulation symbols on the plurality of orthogonal two-dimensional basis functions in order to obtain estimates of the plurality of information symbols.

A communication device, comprising:

• a wireless receiver configured to receive one or more modulated waveforms;
• a processor;
• and
• a memory including program code executable by the processor, the program code including:
• code for causing the processor to receive, from the wireless receiver, samples of one or more modulated waveforms;
• code for causing the processor to matched filter samples of the one or more modulated waveforms with respect to a receive pulse to produce estimated time-frequency modulation symbols wherein each of the estimated time-frequency modulation symbols corresponds to modulation of one of a plurality of orthogonal two-dimensional basis functions by one of a plurality of information symbols;
• and
• code for causing the processor to project the estimated time-frequency modulation symbols on the plurality of orthogonal two-dimensional basis functions in order to obtain estimates of the plurality of information symbols.