Orthogonal time frequency space communication system compatible with OFDM
First Claim
Patent Images
1. A method of transmitting data over a communication channel, the method comprising:
- receiving a plurality of information symbols;
encoding an N×
M array containing the plurality of information symbols into a two-dimensional array of orthogonal time frequency space (OTFS) modulation symbols by spreading the plurality of information symbols across both time and frequency by a corresponding plurality of two-dimensional basis functions wherein the corresponding plurality of two-dimensional basis functions are mutually orthogonal with respect to both time and frequency and wherein the array of OTFS modulation symbols is arranged in a time frequency frame along with one or more orthogonal frequency-division multiple access (OFDM) symbols and wherein N and M are integers;
transmitting the two-dimensional array of OTFS modulation symbols using M narrowband subcarriers; and
transmitting the one or more OFDM symbols using at least one OFDM subcarrier.
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Abstract
A system and method for orthogonal time frequency space communication and waveform generation compatible with OFDM. 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 along with one or more OFDM symbols using a plurality of narrowband subcarriers.
218 Citations
11 Claims
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1. A method of transmitting data over a communication channel, the method comprising:
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receiving a plurality of information symbols; encoding an N×
M array containing the plurality of information symbols into a two-dimensional array of orthogonal time frequency space (OTFS) modulation symbols by spreading the plurality of information symbols across both time and frequency by a corresponding plurality of two-dimensional basis functions wherein the corresponding plurality of two-dimensional basis functions are mutually orthogonal with respect to both time and frequency and wherein the array of OTFS modulation symbols is arranged in a time frequency frame along with one or more orthogonal frequency-division multiple access (OFDM) symbols and wherein N and M are integers;transmitting the two-dimensional array of OTFS modulation symbols using M narrowband subcarriers; and transmitting the one or more OFDM symbols using at least one OFDM subcarrier. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of transmitting data over a communication channel, the method comprising:
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receiving a plurality of information symbols; encoding an N×
M array containing the plurality of information symbols into a two-dimensional array of orthogonal time frequency space (OTFS) modulation symbols by using each of the plurality of information symbols frequency to modulate one of by a corresponding plurality of two-dimensional basis functions wherein the array of OTFS modulation symbols is arranged in a time frequency frame along with one or more orthogonal frequency-division multiple access (OFDM) symbols, wherein N and M are integers, and wherein the encoding is performed in accordance with the following relationship;
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8. A communication device, comprising:
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a wireless transmitter; a processor; and a non-transitory memory including program code executable by the processor, the program code including code for causing the processor to; receive a plurality of information symbols; encode an N×
M array containing the plurality of information symbols into a two-dimensional array of orthogonal time frequency space (OTFS) modulation symbols by spreading the plurality of information symbols across both time and frequency by a corresponding plurality of two-dimensional basis functions wherein the corresponding plurality of two-dimensional basis functions are mutually orthogonal with respect to both time and frequency and wherein the array of OTFS modulation symbols is arranged in a time frequency frame along with one or more orthogonal frequency-division multiple access (OFDM) symbols and wherein N and M are integers;transmit the two-dimensional array of OTFS modulation symbols using M narrowband subcarriers; and transmit the one or more OFDM symbols using at least one OFDM subcarrier. - View Dependent Claims (9, 10, 11)
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Specification