Orthogonal time frequency space modulation system for the Internet of Things

• US 10,469,215 B2
• Filed: 04/29/2016
• Issued: 11/05/2019
• Est. Priority Date: 06/25/2012
• Status: Active Grant

• Current Assignee: Cohere Technologies Inc
• Original Assignee: Cohere Technologies Inc
• Inventors: Rakib, Selim Shlomo, Hadani, Ronny
• Primary Examiner(s): Renner, Brandon M
• Assistant Examiner(s): Ajid, Abdeltif
• Application Number:
  US15/143,323
• Publication Number:
  US 20170033899A1
• Time in Patent Office: 1,285 Days
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04J 2011/0009 with FDM/FDMA
• CPC Class Codes: H04J 2011/0013 with TDM/TDMA
• 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 27/2636 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 27/2639 Modulators using other transforms, e.g. discrete cosine transforms, Orthogonal Time Frequency and Space [OTFS] or hermetic transforms
• CPC Class Codes: H04L 27/2646 using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
• 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 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 67/10 in which an application is distributed across nodes in the network software deployment G06F8/60; multiprogramming arrangements G06F9/46
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A system and method of operating an Internet of Things (IOT) device and an IOT manager device. The method includes determining, during operation of the IOT device in a low power mode, an orthogonal time frequency space (OTFS) transmission waveform using two-dimensional (2D) channel state information relevant to a delay-Doppler channel domain. The method further includes transmitting, during operation of the IOT device in a high power mode, the OTFS transmission waveform. The process of determining the OTFS transmission waveform may include, for example, receiving, from the IOT manager device, the 2D channel state information and storing it within a memory of the IOT device. Alternatively, at least one OTFS pilot transmission may be received from the IOT manager device and the 2D channel state information determined using the OTFS pilot transmission.

Claims

1. A method of operating an Internet of things (IOT) device, the method comprising:

receiving, from an IOT manager device, at least one orthogonal time frequency space (OTFS) pilot transmission;

determining two-dimensional (2D) channel state information for a channel using the OTFS pilot transmission;

determining, during operation in a low power mode, an OTFS transmission waveform using the 2D channel state information wherein the (2D) channel state information is with respect to a delay-Doppler channel domain and wherein, for a path delay τ

in the channel and a Doppler shift ν

in the channel, the impulse response h(τ

, ν

) of the channel in the delay-Doppler channel domain is time-independent; and

transmitting, during operation in a high power mode, the OTFS transmission waveform.

2. The method of claim 1 wherein the determining the OTFS transmission waveform includes precoding at least one OTFS data symbol using the 2D channel state information.

3. A method of operating an Internet of things (IOT) device, the method comprising:

receiving, from an IOT manager device, at least one orthogonal time frequency space (OTFS) pilot transmission;

determining two-dimensional (2D) channel state information for a channel using the at least one OTFS pilot transmission;

operating a processor of the IOT device in a low power mode;

creating, during operation in the low power mode, an OTFS waveform using an OTFS data symbol and the 2D channel state information wherein the 2D channel state information is with respect to a delay-Doppler channel domain and wherein, for a path delay τ

in the channel and a Doppler shift ν

in the channel, the impulse response h(τ

, ν

) of the channel in the delay-Doppler channel domain is time-independent;

transitioning operation of the processor to a high power mode;

transmitting the OTFS waveform during the operation of the processor in the high power mode; and

transitioning, after the transmitting, the processor to operation in the low power mode.

4. The method of claim 3 wherein the IOT device is included among a plurality of IOT devices in wireless communication with the IOT manager device and wherein the plurality of IOT devices are configured to transmit OTFS waveforms generated using OTFS data symbols occupying locations within an OTFS data frame uniquely corresponding to ones of the plurality of IOT devices.

5. The method of claim 4 wherein the IOT device includes a sensor, the method including performing an unscheduled OTFS data transmission in response to input provided by the sensor wherein the unscheduled OTFS data transmission is generated using an OTFS data symbol associated with a reserved location in the OTFS data frame different from the locations within the OTFS data frame uniquely corresponding to the ones of the plurality of IOT devices.

6. An Internet of things (IOT) device, comprising:

a transceiver configured to receive, from an IOT manager device, at least one orthogonal time frequency space (OTFS) pilot transmission;

a processor capable of operating in a low power mode and in a high power mode; and

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

code for determining two-dimensional (2D) channel state information for a channel using the at least one OTFS pilot transmission;

code for determining, during operation of the processor in the low power mode, an OTFS transmission waveform using the 2D channel state information wherein the (2D) channel state information is with respect to a delay-Doppler channel domain and wherein, for a path delay τ

in the channel and a Doppler shift ν

in the channel, the impulse response h(τ

, ν

) of the channel in the delay-Doppler channel domain is time independent;

code for causing the transceiver to transmit, during operation of the processor in the high power mode, the OTFS transmission waveform.

7. The IOT device of claim 6 wherein the code for determining includes code for precoding at least one OTFS data symbol using the 2D channel state information.

8. An Internet of things (IOT) device, comprising:

a wireless transceiver configured to receive, from an IOT manager device, at least one orthogonal time frequency space (OTFS) pilot transmission;

a processor capable of operating in a low power mode and in a high power mode; and

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

code for determining two-dimensional (2D) channel state information for a channel using the at least one OTFS pilot transmission;

code for causing the processor to transition from operation in the low power mode to operation in the high power mode;

code for causing the wireless transceiver to transmit an OTFS waveform during the operation of the IOT device in the high power mode;

code for creating, during operation of the processor in the low power mode, the OTFS waveform using an OTFS data symbol and the 2D channel state information wherein the 2D channel state information is with respect to a delay-Doppler channel domain and wherein, for a path delay τ

in the channel and a Doppler shift ν

in the channel, the impulse response h (τ

, ν

) of the channel in the delay-Doppler channel domain is time-independent;

code for causing processor to transition, after the transmitting, to operation in the low power mode.

9. The IOT device of claim 8 wherein the IOT device is included among a plurality of IOT devices in wireless communication with an IOT manager device and wherein the plurality of IOT devices are configured to transmit OTFS waveforms generated using OTFS data symbols occupying locations within an OTFS data frame uniquely corresponding to ones of the plurality of IOT devices.

10. The IOT device of claim 9 wherein the IOT device further includes a sensor and wherein the program code further includes code for performing an unscheduled OTFS data transmission in response to input provided by the sensor wherein the unscheduled OTFS data transmission is generated using an OTFS data symbol associated with a reserved location in the OTFS data frame different from the locations within the OTFS data frame uniquely corresponding to the ones of the plurality of IOT devices.