Multiple access using orthogonal time frequency space modulation

Patent metadata

Field	Value
Publication number	US-12068846-B2
Application number	US-202117443004-A
Country	US
Kind code	B2
Filing date	Jul 19, 2021
Priority date	Sep 7, 2015
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

An Orthogonal Time Frequency Space Modulation (OTFS) modulation scheme achieving multiple access by multiplexing multiple signals at the transmitter-side performs allocation of transmission resources to a first signal and a second signal, combining and converting to a transmission format via OTFS modulation and transmitting the signal over a communication channel. At the receiver, multiplexed signals are recovered using orthogonality property of the basis functions used for the multiplexing at the transmitter.

First claim

The invention claimed is:

1. A signal reception method, implemented at a receiver apparatus, comprising:
receiving a signal transmission comprising at least two component signals multiplexed together;
wherein the at least two component signals include a first component signal carrying user data for the receiver apparatus and a second component signal carrying user data for another receiver apparatus or a reference signal transmission;
transforming, using an orthogonal transform, the signal transmission into a post-processing format, wherein the post-processing format represents the at least two component signals in a two-dimensional time-frequency plane;
recovering, by performing an orthogonal time frequency space transformation, a multiplexed signal in a two-dimensional delay-Doppler plane, from the post-processing format, wherein the two-dimensional delay-Doppler plane comprises a lattice with lattice points defined as (m/Δf, n/T), wherein 1/Δf is a maximum delay representable on the two-dimensional delay-Doppler plane, 1/T is a maximum Doppler representable on the two-dimensional delay-Doppler plane, and m and n are integers; and
demultiplexing the multiplexed signal to recover one of the at least two component signals.

2. The method of claim 1 , wherein the at least two component signals are multiplexed together to occupy non-overlapping transmission resources in the two-dimensional time-frequency plane.

3. The method of claim 1 , wherein the at least two component signals are multiplexed together to occupy non-overlapping transmission resources in the two-dimensional delay-Doppler plane.

4. The method of claim 1 , wherein the at least two component signals are composed of mutually orthogonal basis functions in the two-dimensional delay-Doppler plane.

5. The method of claim 1 , wherein the orthogonal transform comprises a Wigner transform.

6. A receiver apparatus, comprising:
a transceiver configured to receive a signal transmission comprising at least two component signals multiplexed together;
wherein the at least two component signals include a first component signal carrying user data for the receiver apparatus and a second component signal carrying user data for another receiver apparatus or a reference signal transmission; and
a processor, coupled to the transceiver, configured to:
transform, using an orthogonal transform, the signal transmission into a post-processing format, wherein the post-processing format represents the at least two component signals in a two-dimensional time-frequency plane,
recover, by performing an orthogonal time frequency space transformation, a multiplexed signal in a two-dimensional delay-Doppler plane, from the post-processing format, wherein the two-dimensional delay-Doppler plane comprises a lattice with lattice points defined as (m/Δf, n/T), wherein 1/Δf is a maximum delay representable on the two-dimensional delay-Doppler plane, 1/T is a maximum Doppler representable on the two-dimensional delay-Doppler plane, and m and n are integers, and
demultiplex the multiplexed signal to recover one of the at least two component signals.

7. The receiver apparatus of claim 6 , wherein the at least two component signals are multiplexed together to occupy non-overlapping transmission resources in the two-dimensional time-frequency plane.

8. The receiver apparatus of claim 6 , wherein the at least two component signals are multiplexed together to occupy non-overlapping transmission resources in the two-dimensional delay-Doppler plane.

9. The receiver apparatus of claim 6 , wherein the at least two component signals are composed of mutually orthogonal basis functions in the two-dimensional delay-Doppler plane.

10. The receiver apparatus of claim 6 , wherein the orthogonal transform comprises a Wigner transform.

11. A non-transitory computer-readable storage medium having instructions stored thereupon for signal reception, comprising:
instructions for receiving a signal transmission comprising at least two component signals multiplexed together, wherein the at least two component signals include a first component signal carrying user data for a receiver apparatus and a second component signal carrying user data for another receiver apparatus or a reference signal transmission;
instructions for transforming, using an orthogonal transform, the signal transmission into a post-processing format, wherein the post-processing format represents the at least two component signals in a two-dimensional time-frequency plane;
instructions for recovering, by performing an orthogonal time frequency space transformation, a multiplexed signal in a two-dimensional delay-Doppler plane, from the post-processing format, wherein the two-dimensional delay-Doppler plane comprises a lattice with lattice points defined as (m/Δf, n/T), wherein 1/Δf is a maximum delay representable on the two-dimensional delay-Doppler plane, 1/T is a maximum Doppler representable on the two-dimensional delay-Doppler plane, and m and n are integers; and
instructions for demultiplexing the multiplexed signal to recover one of the at least two component signals.

12. The non-transitory computer-readable storage medium of claim 11 , wherein the at least two component signals are multiplexed together to occupy non-overlapping transmission resources in the two-dimensional time-frequency plane or in the two-dimensional delay-Doppler plane.

13. The non-transitory computer-readable storage medium of claim 11 , wherein the at least two component signals are composed of mutually orthogonal basis functions in the two-dimensional delay-Doppler plane.

14. The non-transitory computer-readable storage medium of claim 11 , wherein the orthogonal transform comprises a Wigner transform.

15. The signal reception method of claim 1 , wherein the transforming comprises processing the signal transmission through a filter bank demodulator or an orthogonal frequency division multiplexing (OFDM) demodulator.

16. The signal reception method of claim 1 , wherein the performing the orthogonal time frequency space transformation comprises applying a symplectic Fourier transform to the signal transmission in the post-processing format.

17. The receiver apparatus of claim 6 , wherein the processor is configured to transform the signal transmission by processing through a filter bank demodulator or an orthogonal frequency division multiplexing (OFDM) demodulator.

18. The receiver apparatus of claim 6 , wherein the processor is configured to perform the orthogonal time frequency space transformation by applying a symplectic Fourier transform to the signal transmission in the post-processing format.

19. The non-transitory computer-readable storage medium of claim 11 , wherein the transforming comprises processing the signal transmission through a filter bank demodulator or an orthogonal frequency division multiplexing (OFDM) demodulator.

20. The non-transitory computer-readable storage medium of claim 11 , wherein the performing the orthogonal time frequency space transformation comprises applying a symplectic Fourier transform to the signal transmission in the post-processing format.

Assignees

• Cohere Tech Inc

Inventors

• Hadani Ronny
• Monk Anton
• Rakib Shlomo Selim
• Tsatsanis Michail

Classifications

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L5/0007 Primary

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L25/03834

  using pulse shaping · CPC title

• H04L5/0023

  Time-frequency-space · CPC title

• H04L1/0071

  Use of interleaving (interleaving per se H03M13/27) · CPC title