Variable latency data communication using orthogonal time frequency space modulation

• US 10,476,564 B2
• Filed: 12/09/2016
• Issued: 11/12/2019
• Est. Priority Date: 06/25/2012
• Status: Active Grant

• Current Assignee: Cohere Technologies Inc
• Original Assignee: Cohere Technologies Inc
• Inventors: Hadani, Ronny, Rakib, Shlomo Selim
• Primary Examiner(s): Lugo, David B.
• Application Number:
  US15/374,989
• Publication Number:
  US 20170244524A1
• Time in Patent Office: 1,068 Days
• CPC Class Codes: H04B 1/02 Transmitters
• CPC Class Codes: H04B 1/12 Neutralising, balancing, or compensation arrangements
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04J 11/0026 of multi-user interference
• CPC Class Codes: H04J 2011/0016 with FDM/FDMA and TDM/TDMA
• CPC Class Codes: H04L 23/02 adapted for orthogonal signalling
• CPC Class Codes: H04L 25/03834 using pulse shaping
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04L 27/26362 Subcarrier weighting equivalent to time domain filtering, e.g. weighting per subcarrier multiplication arrangements for removing intersymbol interference at the transmitter end H04L25/03343
• 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 27/26524 Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
• 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 5/0005 Time-frequency
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 : Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 4/70 : Services for machine-to-machine communication [M2M] or machine type communication [MTC]

Abstract

A system and method of variable latency data transmission. The method includes transforming a first original data frame in accordance with a first time-frequency transformation so as to provide a first transformed data frame wherein the first time-frequency transformation is associated with a first latency. The method further includes transforming a second original data frame in accordance with a second time-frequency transformation so as to provide a second transformed data frame wherein the second time-frequency transformation is associated with a second latency. Using a transmitter, elements of the first transformed data frame are transmitted over a first frame period corresponding to the first latency and elements of the second transformed data frame are transmitted over a second frame period corresponding to the second latency wherein the first frame period is different from the second frame period.

Claims

1. A method of variable latency data transmission, the method comprising:

transforming a first original data frame in accordance with a first time-frequency transformation so as to provide a first transformed data frame wherein the first time-frequency transformation is associated with a first latency and wherein the transforming the first original data frame includes using each of a plurality of first information elements of the first original data frame to modulate one of a first plurality of two-dimensional basis functions, each of the first plurality of two-dimensional basis functions being a complex exponential uniquely associated with one of the plurality of first information elements;

transforming a second original data frame in accordance with a second time-frequency transformation so as to provide a second transformed data frame wherein the second time-frequency transformation is associated with a second latency and wherein the transforming the second original data frame includes using each of a plurality of second information elements of the second original data frame to modulate one of a second plurality of two-dimensional basis functions, each of the second plurality of two-dimensional basis functions being a complex exponential uniquely associated with one of the plurality of second information elements; and

transmitting, using a transmitter, elements of the first transformed data frame as a first set of modulated complex exponential bases over a first frame period corresponding to the first latency and transmitting elements of the second transformed data frame as a second set of modulated complex exponential bases over a second frame period corresponding to the second latency wherein the first frame period is different from the second frame period.

2. The method of claim 1 wherein the elements of the first transformed data frame are interleaved with the elements of the second transformed data frame within a transformed data matrix.

3. The method of claim 1 wherein the elements of the first transformed data frame are positioned contiguous to the elements of the second transformed data frame within a transformed data matrix.

4. The method of claim 1 wherein the transforming the first original data frame includes spreading the first original data frame using a first basis matrix having more than one row and more than one column and wherein the transforming the second original data frame includes spreading the second original data frame using a second basis matrix different from the first basis matrix, the second basis matrix having more than one row and more than one column.

5. A method, comprising:

receiving, at a receiver, a first modulated signal representative of a first transformed data frame wherein the first transformed data frame is generated by transforming a first original data frame in accordance with a first time-frequency transformation associated with a first latency and wherein the transforming the first original data frame includes using each of a plurality of first information elements of the first original data frame to modulate one of a first plurality of two-dimensional basis functions, each of the first plurality of two-dimensional basis functions being a complex exponential uniquely associated with one of the plurality of first information elements;

receiving, at the receiver, a second modulated signal representative of a second transformed data frame wherein the second transformed data frame is generated by transforming a second original data frame in accordance with a second time-frequency transformation associated with a second latency; and

processing the first modulated signal and the second modulated signal to estimate the first transformed data frame and the second transformed data frame; and

reconstructing the first original data frame and the second original data frame based upon the processing.

6. The method of claim 5 wherein the elements of the first transformed data frame are interleaved with the elements of the second transformed data frame within a transformed data matrix.

7. The method of claim 6 wherein the elements of the first transformed data frame are positioned contiguous to the elements of the second transformed data frame within a transformed data matrix.

8. A communication device, comprising:

a wireless transmitter;

a processor; and

a memory including program code executable by the processor, the program code including;

first code for causing the processor to transform a first original data frame in accordance with a first time-frequency transformation so as to provide a first transformed data frame wherein the first time-frequency transformation is associated with a first latency wherein the first code includes code for using each of a plurality of first information elements of the first original data frame to modulate one of a first plurality of two-dimensional basis functions wherein each of the first plurality of two-dimensional basis functions is a complex exponential uniquely associated with one of the plurality of first information elements;

second code for causing the processor to transform a second original data frame in accordance with a second time-frequency transformation so as to provide a second transformed data frame wherein the second time-frequency transformation is associated with a second latency wherein the second code includes code for using each of a plurality of second information elements of the second original data frame to modulate one of a second plurality of two-dimensional basis functions and wherein each of the second plurality of two-dimensional basis functions is a complex exponential uniquely associated with one of the plurality of second information elements; and

third code for causing the processor to send the first transformed data frame and the second transformed data frame to the wireless transmitter wherein the wireless transmitter is configured to transmit elements of the first transformed data frame as a first set of modulated complex exponential bases over a first frame period corresponding to the first latency and to transmit elements of the second transformed data frame as a second set of modulated complex exponential bases over a second frame period corresponding to the second latency wherein the first frame period is different from the second frame period.

9. The communication device of claim 8 wherein the elements of the first transformed data frame are interleaved with the elements of the second transformed data frame within a transformed data matrix.

10. The communication device of claim 8 wherein the elements of the first transformed data frame are positioned contiguous to the elements of the second transformed data frame within a transformed data matrix.

11. The communication device of claim 8 wherein the first code for causing the processor to transform the first original data frame includes code for causing the processor to spread the first original data frame using a first basis matrix having more than one row and more than one column and wherein the second code for causing the processor to transform the second original data frame includes code for causing the processor to spread the second original data frame using a second basis matrix different from the first basis matrix, the second basis matrix having more than one row and more than one column.

12. A communication device, comprising:

a processor;

a wireless receiver configured to receive a first modulated signal representative of a first transformed data frame and to receive a second modulated signal representative of a second transformed data frame, the first transformed data frame having been generated by transforming a first original data frame in accordance with a first time-frequency transformation associated with a first latency wherein the transforming the first original data frame includes using each of a plurality of information elements of the first original data frame to modulate one of a plurality of two-dimensional basis functions wherein each of the plurality of two-dimensional basis functions is a complex exponential uniquely associated with one of the plurality of information elements and the second transformed data frame having been generated by transforming a second original data frame in accordance with a second time-frequency transformation associated with a second latency; and

a memory including program code executable by the processor, the program code including;

code for causing the processor to process the first modulated signal and the second modulated signal to estimate the first transformed data frame and the second transformed data frame;

code for causing the processor to reconstruct the first original data frame and the second original data frame based upon the processing.