Orthogonal time frequency space communication system compatible with OFDM
First Claim
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1. A method of receiving a modulated signal, the method comprising:
- receiving a plurality of signal components of the modulated signal;
generating, by performing an 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; and
wherein the windowing operation either uses a window that is matched to a transmitter-side window, selected to randomize phases of symbols in the modulated signal, or uses a 2D window function.
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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.
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Citations
18 Claims
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1. A method of receiving a modulated signal, the method comprising:
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receiving a plurality of signal components of the modulated signal; generating, by performing an 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; and wherein the windowing operation either uses a window that is matched to a transmitter-side window, selected to randomize phases of symbols in the modulated signal, or uses a 2D window function. - View Dependent Claims (2, 3, 4)
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5. A method of receiving a modulated signal, the method comprising:
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receiving a plurality of signal components of the modulated signal; generating, by performing a Multicarrier Filter Bank (MCFB) 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. - View Dependent Claims (6, 7, 8)
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9. A receiver apparatus, the apparatus comprising:
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a receiver front end, the receiver front end being configured to receive a plurality of signal components of a modulated signal; an 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; and wherein the windowing operation either uses a window that is matched to a transmitter-side window, selected to randomize phases of symbols in the modulated signal, or uses a 2D window function. - View Dependent Claims (10, 11, 12, 13)
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14. A receiver apparatus, the apparatus comprising:
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a receiver front end, the receiver front end being configured to receive a plurality of signal components of a modulated signal; a MCFB demodulator configured to generate a plane of estimated time-frequency modulation symbols based upon the plurality of signal components; and an 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. - View Dependent Claims (15, 16, 17, 18)
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Specification