公开(公告)号：US20190036577A1

公开(公告)日：2019-01-31

申请号：US16044414

申请日：2018-07-24

Applicant: Cohere Technologies, Inc.

Inventor： Jim Delfeld ,  Shlomo Selim Rakib

IPC: H04B7/0456 ,  H04L27/26 ,  H04L25/497 ,  H04L25/02 ,  H04L5/00 ,  H04B7/0413

Abstract: A method for signal transmission using precoded symbol information involves estimating a two-dimensional model of a communication channel in a delay-Doppler domain. A perturbation vector is determined in a delay-time domain wherein the delay-time domain is related to the delay-Doppler domain by an FFT operation. User symbols are modified based upon the perturbation vector so as to produce perturbed user symbols. A set of Tomlinson-Harashima precoders corresponding to a set of fixed times in the delay-time domain may then be determined using a delay-time model of the communication channel. Precoded user symbols are generated by applying the Tomlinson-Harashima precoders to the perturbed user symbols. A modulated signal is then generated based upon the precoded user symbols and provided for transmission over the communication channel.

公开(公告)号：US11968144B2

公开(公告)日：2024-04-23

申请号：US17805569

申请日：2022-06-06

Applicant: Cohere Technologies, Inc.

Inventor： Yoav Hebron ,  Shlomo Selim Rakib ,  Ronny Hadani ,  Michail Tsatsanis ,  Clayton Ambrose ,  Jim Delfeld ,  Robert Fanfelle

IPC: H04L25/02 ,  H04B7/005 ,  H04B17/309 ,  H04B17/373 ,  H04L5/00 ,  H04L27/01 ,  H04L27/26

CPC classification number: H04L5/0048 ,  H04B7/005 ,  H04B17/309 ,  H04B17/373 ,  H04L5/0007 ,  H04L5/0044 ,  H04L25/0202 ,  H04L25/0204 ,  H04L25/0226 ,  H04L25/0232 ,  H04L27/01 ,  H04L27/2639 ,  H04L27/2647

Abstract: Techniques for performing channel estimation in an orthogonal time, frequency and space (OTFS) communication system include receiving a wireless signal comprising a data signal portion and a pilot signal portion in which the pilot signal portion includes multiple pilot signals multiplexed together in the OTFS domain, performing two-dimensional channel estimation in a time-frequency domain based on a minimum mean square error (MMSE) optimization criterion, and recovering information bits using a channel estimate obtained from the two-dimensional channel estimation.

公开(公告)号：US11646844B2

公开(公告)日：2023-05-09

申请号：US17329071

申请日：2021-05-24

Applicant: Cohere Technologies, Inc.

Inventor： Jim Delfeld ,  Shlomo Selim Rakib

IPC: H04B7/0456 ,  H04L27/26 ,  H04L25/497 ,  H04L25/02 ,  H04L5/00 ,  H04B7/0413 ,  H04L25/03

CPC classification number: H04L5/0048 ,  H04B7/0456 ,  H04L25/0222 ,  H04L25/03343 ,  H04L25/4975 ,  H04B7/0413

Abstract: A method for signal transmission using precoded symbol information involves estimating a two-dimensional model of a communication channel in a delay-Doppler domain. A perturbation vector is determined in a delay-time domain wherein the delay-time domain is related to the delay-Doppler domain by an FFT operation. User symbols are modified based upon the perturbation vector so as to produce perturbed user symbols. A set of Tomlinson-Harashima precoders corresponding to a set of fixed times in the delay-time domain may then be determined using a delay-time model of the communication channel. Precoded user symbols are generated by applying the Tomlinson-Harashima precoders to the perturbed user symbols. A modulated signal is then generated based upon the precoded user symbols and provided for transmission over the communication channel.

公开(公告)号：US11362786B2

公开(公告)日：2022-06-14

申请号：US16947799

申请日：2020-08-17

Applicant: Cohere Technologies, Inc.

Inventor： Yoav Hebron ,  Shlomo Selim Rakib ,  Ronny Hadani ,  Michail Tsatsanis ,  Clayton Ambrose ,  Jim Delfeld ,  Robert Fanfelle

IPC: H04L25/02 ,  H04L5/00 ,  H04L27/01 ,  H04L27/26 ,  H04B7/005 ,  H04B17/309 ,  H04B17/373

Abstract: Techniques for performing channel estimation in an orthogonal time, frequency and space (OTFS) communication system include receiving a wireless signal comprising a data signal portion and a pilot signal portion in which the pilot signal portion includes multiple pilot signals multiplexed together in the OTFS domain, performing two-dimensional channel estimation in a time-frequency domain based on a minimum mean square error (MMSE) optimization criterion, and recovering information bits using a channel estimate obtained from the two-dimensional channel estimation.

公开(公告)号：US20210036823A1

公开(公告)日：2021-02-04

申请号：US16947799

申请日：2020-08-17

Applicant: Cohere Technologies, Inc.

Inventor： Yoav Hebron ,  Shlomo Selim Rakib ,  Ronny Hadani ,  Michail Tsatsanis ,  Clayton Ambrose ,  Jim Delfeld ,  Robert Fanfelle

IPC: H04L5/00 ,  H04L25/02 ,  H04L27/01 ,  H04L27/26 ,  H04B7/005 ,  H04B17/309 ,  H04B17/373

Abstract: Techniques for performing channel estimation in an orthogonal time, frequency and space (OTFS) communication system include receiving a wireless signal comprising a data signal portion and a pilot signal portion in which the pilot signal portion includes multiple pilot signals multiplexed together in the OTFS domain, performing two-dimensional channel estimation in a time-frequency domain based on a minimum mean square error (MMSE) optimization criterion, and recovering information bits using a channel estimate obtained from the two-dimensional channel estimation.

公开(公告)号：US20240348389A1

公开(公告)日：2024-10-17

申请号：US18628558

申请日：2024-04-05

Applicant: Cohere Technologies, Inc.

Inventor： Yoav Hebron ,  Shlomo Selim Rakib ,  Ronny Hadani ,  Michail Tsatsanis ,  Clayton Ambrose ,  Jim Delfeld ,  Robert Fanfelle

IPC: H04L5/00 ,  H04B7/005 ,  H04B17/309 ,  H04B17/373 ,  H04L25/02 ,  H04L27/01 ,  H04L27/26

CPC classification number: H04L5/0048 ,  H04B7/005 ,  H04B17/309 ,  H04B17/373 ,  H04L5/0007 ,  H04L5/0044 ,  H04L25/0202 ,  H04L25/0204 ,  H04L25/0226 ,  H04L25/0232 ,  H04L27/01 ,  H04L27/2639 ,  H04L27/2647

Abstract: Techniques for performing channel estimation in an orthogonal time, frequency and space (OTFS) communication system include receiving a wireless signal comprising a data signal portion and a pilot signal portion in which the pilot signal portion includes multiple pilot signals multiplexed together in the OTFS domain, performing two-dimensional channel estimation in a time-frequency domain based on a minimum mean square error (MMSE) optimization criterion, and recovering information bits using a channel estimate obtained from the two-dimensional channel estimation.

公开(公告)号：US11018731B2

公开(公告)日：2021-05-25

申请号：US16748218

申请日：2020-01-21

Applicant: Cohere Technologies, Inc.

Inventor： Jim Delfeld ,  Shlomo Selim Rakib

IPC: H04B7/0456 ,  H04L27/26 ,  H04L25/497 ,  H04L25/02 ,  H04L5/00 ,  H04B7/0413 ,  H04L25/03

Abstract: A method for signal transmission using precoded symbol information involves estimating a two-dimensional model of a communication channel in a delay-Doppler domain. A perturbation vector is determined in a delay-time domain wherein the delay-time domain is related to the delay-Doppler domain by an FFT operation. User symbols are modified based upon the perturbation vector so as to produce perturbed user symbols. A set of Tomlinson-Harashima precoders corresponding to a set of fixed times in the delay-time domain may then be determined using a delay-time model of the communication channel. Precoded user symbols are generated by applying the Tomlinson-Harashima precoders to the perturbed user symbols. A modulated signal is then generated based upon the precoded user symbols and provided for transmission over the communication channel.

公开(公告)号：US10541734B2

公开(公告)日：2020-01-21

申请号：US16044414

申请日：2018-07-24

Applicant: Cohere Technologies, Inc.

Inventor： Jim Delfeld ,  Shlomo Selim Rakib

IPC: H04B7/0456 ,  H04L27/26 ,  H04L25/497 ,  H04L25/02 ,  H04L5/00 ,  H04B7/0413

Abstract: A method for signal transmission using precoded symbol information involves estimating a two-dimensional model of a communication channel in a delay-Doppler domain. A perturbation vector is determined in a delay-time domain wherein the delay-time domain is related to the delay-Doppler domain by an FFT operation. User symbols are modified based upon the perturbation vector so as to produce perturbed user symbols. A set of Tomlinson-Harashima precoders corresponding to a set of fixed times in the delay-time domain may then be determined using a delay-time model of the communication channel. Precoded user symbols are generated by applying the Tomlinson-Harashima precoders to the perturbed user symbols. A modulated signal is then generated based upon the precoded user symbols and provided for transmission over the communication channel.

公开(公告)号：US10063295B2

公开(公告)日：2018-08-28

申请号：US15478174

申请日：2017-04-03

Applicant: Cohere Technologies, Inc.

Inventor： Jim Delfeld ,  Shlomo Selim Rakib

IPC: H04B1/04 ,  H04B7/0456 ,  H04L25/02 ,  H04L5/00 ,  H04L27/26

Abstract: A method for signal transmission using precoded symbol information involves estimating a two-dimensional model of a communication channel in a delay-Doppler domain. A perturbation vector is determined in a delay-time domain wherein the delay-time domain is related to the delay-Doppler domain by an FFT operation. User symbols are modified based upon the perturbation vector so as to produce perturbed user symbols. A set of Tomlinson-Harashima precoders corresponding to a set of fixed times in the delay-time domain may then be determined using a delay-time model of the communication channel. Precoded user symbols are generated by applying the Tomlinson-Harashima precoders to the perturbed user symbols. A modulated signal is then generated based upon the precoded user symbols and provided for transmission over the communication channel.

公开(公告)号：US20170288710A1

公开(公告)日：2017-10-05

申请号：US15478174

申请日：2017-04-03

Applicant: Cohere Technologies, Inc.

Inventor： Jim Delfeld ,  Shlomo Selim Rakib

IPC: H04B1/04 ,  H04B7/0456 ,  H04L27/26 ,  H04L25/02 ,  H04L5/00

CPC classification number: H04B7/0456 ,  H04B7/0413 ,  H04L5/0048 ,  H04L25/0222 ,  H04L25/4975 ,  H04L27/265

Abstract: A method for signal transmission using precoded symbol information involves estimating a two-dimensional model of a communication channel in a delay-Doppler domain. A perturbation vector is determined in a delay-time domain wherein the delay-time domain is related to the delay-Doppler domain by an FFT operation. User symbols are modified based upon the perturbation vector so as to produce perturbed user symbols. A set of Tomlinson-Harashima precoders corresponding to a set of fixed times in the delay-time domain may then be determined using a delay-time model of the communication channel. Precoded user symbols are generated by applying the Tomlinson-Harashima precoders to the perturbed user symbols. A modulated signal is then generated based upon the precoded user symbols and provided for transmission over the communication channel.