System and method for implementing orthogonal time frequency space communications using OFDM

• US 9,893,922 B2
• Filed: 02/17/2017
• Issued: 02/13/2018
• Est. Priority Date: 06/25/2012
• Status: Active Grant

• Current Assignee: Cohere Technologies Inc
• Original Assignee: Cohere Technologies Inc
• Inventors: Rakib, Shlomo Selim, Hadani, Ronny
• Primary Examiner(s): Tran, Khanh C
• Application Number:
  US15/436,653
• Publication Number:
  US 20170230215A1
• Time in Patent Office: 361 Days
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04L 23/02 adapted for orthogonal signalling
• CPC Class Codes: H04L 25/03834 using pulse shaping
• CPC Class Codes: H04L 27/0002 analog front ends; means for connecting modulators, demodulators or transceivers to a transmission line duplex arrangements H04L5/143
• CPC Class Codes: H04L 27/2627 Modulators
• CPC Class Codes: H04L 27/2639 Modulators using other transforms, e.g. discrete cosine transforms, Orthogonal Time Frequency and Space [OTFS] or hermetic transforms
• CPC Class Codes: H04L 27/26414 Filtering per subband or per resource block, e.g. universal filtered multicarrier [UFMC] or generalized frequency division multiplexing [GFDM]
• CPC Class Codes: H04L 27/26416 Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]
• CPC Class Codes: H04L 27/26538 Filtering per subband or per resource block, e.g. universal filtered multicarrier [UFMC] or generalized frequency division multiplexing [GFDM]
• CPC Class Codes: H04L 27/2654 Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]
• CPC Class Codes: H04L 27/2655 Synchronisation arrangements
• CPC Class Codes: H04L 27/2697 in combination with other modulation techniques
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks

Abstract

A system and method for orthogonal time frequency space communication and waveform generation. The method includes receiving a plurality of information symbols and encoding an N×M array containing the plurality of information symbols into a two-dimensional array of modulation symbols by spreading each of the plurality of information symbols with respect to both time and frequency. The two-dimensional array of modulation symbols is then transmitted using M mutually orthogonal waveforms included within M frequency sub-bands.

Claims

1. A method of providing a modulated signal useable in a signal transmission system, the method comprising:

performing a two dimensional time-frequency transformation of a data frame including a plurality of information symbols into a plane of time-frequency modulation symbols wherein the performing the two dimensional time-frequency transformation includes performing an inverse time-frequency symplectic transformation and a windowing operation; and

generating the modulated signal based upon the plane of time-frequency modulation symbols using at least one of an orthogonal frequency-division multiple access (OFDM) modulator and a multicarrier filter bank (MCFB) modulator.

2. A method of providing a modulated signal useable in a signal transmission system, the method comprising:

performing a two dimensional time-frequency transformation of a data frame including a plurality of information symbols into a plane of time-frequency modulation symbols; and

generating the modulated signal based upon the plane of time-frequency modulation symbols using at least one of an orthogonal frequency-division multiple access (OFDM) modulator and a multicarrier filter bank (MCFB) modulator wherein the generating includes performing a Heisenberg transform using the plane of time-frequency modulation symbols.

3. A transmitter apparatus, the apparatus comprising:

an orthogonal time frequency space (OTFS) pre-processing unit configured to perform a two dimensional time-frequency transformation of a data frame including a plurality of information symbols into a plane of time-frequency modulation symbols wherein the two dimensional transformation comprises an inverse time-frequency symplectic transformation and a windowing operation; and

at least one of an orthogonal frequency-division multiple access (OFDM) modulator and a multicarrier filter bank (MCFB) modulator configured to generate the modulated signal based upon the plane of time-frequency modulation symbols.

4. A method of receiving a modulated signal, the method comprising:

receiving a plurality of signal components of the modulated signal;

generating, by performing an orthogonal frequency-division multiple access (OFDM) demodulation operation using the plurality of signal components, a plane of estimated time-frequency modulation symbols; and

providing an estimated data frame by performing an inverse of a two dimensional time-frequency transformation with respect to the plane of estimated time-frequency modulation symbols wherein the performing the inverse of the two dimensional time-frequency transformation includes performing a windowing operation and a symplectic Fourier transform.

5. A receiver apparatus, the apparatus comprising:

a receiver front end, the receiver front end being configured to receive a plurality of signal components of a modulated signal;

an orthogonal frequency-division multiple access (OFDM) demodulator configured to generate a plane of estimated time-frequency modulation symbols based upon the plurality of signal components; and

an orthogonal time frequency space (OTFS) post-processing unit operative to provide an estimated data frame, the OTFS post-processing unit performing an inverse of a two dimensional time-frequency transformation with respect to the plane of estimated time-frequency modulation symbols wherein the inverse of the two dimensional time-frequency transformation comprises a windowing operation and a symplectic Fourier transform.