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公开(公告)号：US20220069844A1
公开(公告)日：2022-03-03
申请号：US17451251
申请日：2021-10-18
Applicant: Cohere Technologies, Inc.
Inventor： Vamadevan Namboodiri , Ronny Hadani , Stuart Abrams
Abstract: Methods, systems and devices for forward error correction in orthogonal time frequency space (OTFS) communication systems using non-binary low-density parity-check (NB-LDPC) codes are described. One exemplary method for forward error correction includes receiving data, encoding the data via a non-binary low density parity check (NB-LDPC) code, wherein the NB-LDPC code is characterized by a matrix with binary and non-binary entries, modulating the encoded data to generate a signal, and transmitting the signal. Another exemplary method for forward error correction includes receiving a signal, demodulating the received signal to produce data, decoding the data via a NB-LDPC code, wherein the NB-LDPC code is characterized by a matrix with binary and non-binary entries, and providing the decoded data to a data sink.
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公开(公告)号：US20220158780A1
公开(公告)日：2022-05-19
申请号：US17456843
申请日：2021-11-29
Applicant: Cohere Technologies, Inc.
Inventor： Vamadevan Namboodiri , Karl Sanders , Yaron Rozenbaum , James Delfeld
IPC: H04L5/00 , H04L27/156 , H04L27/26 , H04W52/52
Abstract: Methods, systems and device for achieving synchronization in an orthogonal time frequency space (OTFS) signal receiver are described. An exemplary signal reception technique includes receiving an OTFS modulated wireless signal comprising pilot signal transmissions interspersed with data transmissions, calculating autocorrelation of the wireless signal using the wireless signal and a delayed version of the wireless signal that is delayed by a pre-determined delay, thereby generating an autocorrelation output, processing the autocorrelation filter through a moving average filter to produce a fine timing signal. Another exemplary signal reception technique includes receiving an OTFS modulated wireless signal comprising pilot signal transmissions interspersed with data transmissions, performing an initial automatic gain correction of the received OTFS wireless signal by peak detection and using clipping information, performing coarse automatic gain correction on results of a received and initial automatic gain control (AGC)-corrected signal.
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公开(公告)号：US20200313695A1
公开(公告)日：2020-10-01
申请号：US16651020
申请日：2018-09-29
Applicant: Cohere Technologies
Inventor： Vamadevan Namboodiri , Ronny Hadani , Stuart Abrams
Abstract: Methods, systems and devices for forward error correction in orthogonal time frequency space (OTFS) communication systems using non-binary low-density parity-check (NB-LDPC) codes are described. One exemplary method for forward error correction includes receiving data, encoding the data via a non-binary low density parity check (NB-LDPC) code, wherein the NB-LDPC code is characterized by a matrix with binary and non-binary entries, modulating the encoded data to generate a signal, and transmitting the signal. Another exemplary method for forward error correction includes receiving a signal, demodulating the received signal to produce data, decoding the data via a NB-LDPC code, wherein the NB-LDPC code is characterized by a matrix with binary and non-binary entries, and providing the decoded data to a data sink.
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公开(公告)号：US11190308B2
公开(公告)日：2021-11-30
申请号：US16645585
申请日：2018-09-14
Applicant: Cohere Technologies, Inc.
Inventor： Vamadevan Namboodiri , Karl Sanders , Yaron Rozenbaum , James Delfeld
IPC: H04L5/00 , H04L27/156 , H04L27/26 , H04W52/52
Abstract: Methods, systems and device for achieving synchronization in an orthogonal time frequency space (OTFS) signal receiver are described. An exemplary signal reception technique includes receiving an OTFS modulated wireless signal comprising pilot signal transmissions interspersed with data transmissions, calculating autocorrelation of the wireless signal using the wireless signal and a delayed version of the wireless signal that is delayed by a pre-determined delay, thereby generating an autocorrelation output, processing the autocorrelation filter through a moving average filter to produce a fine timing signal. Another exemplary signal reception technique includes receiving an OTFS modulated wireless signal comprising pilot signal transmissions interspersed with data transmissions, performing an initial automatic gain correction of the received OTFS wireless signal by peak detection and using clipping information, performing coarse automatic gain correction on results of a received and initial automatic gain control (AGC)-corrected signal.
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Patent Agency Ranking
公开(公告)号：US11102034B2
公开(公告)日：2021-08-24
申请号：US16643731
申请日：2018-09-06
Applicant: Cohere Technologies, Inc.
Inventor： Vamadevan Namboodiri , Ronny Hadani , James Delfeld
Abstract: Methods, systems and devices for lattice reduction in decision feedback equalizers for orthogonal time frequency space (OTFS) modulation are described. An exemplary wireless communication method, implementable by a wireless communication receiver apparatus, includes receiving a signal comprising information bits modulated using OTFS modulation scheme. Each delay-Doppler bin in the signal is modulated using a quadrature amplitude modulation (QAM) mapping. The method also includes estimating the information bits based on an inverse of a single error covariance matrix of the signal, with the single error covariance matrix being representative of an estimation error for all delay-Doppler bins in the signal.
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公开(公告)号：US11637663B2
公开(公告)日：2023-04-25
申请号：US17456843
申请日：2021-11-29
Applicant: Cohere Technologies, Inc.
Inventor： Vamadevan Namboodiri , Karl Sanders , Yaron Rozenbaum , James Delfeld
IPC: H04L5/00 , H04L27/156 , H04L27/26 , H04W52/52
Abstract: Methods, systems and device for achieving synchronization in an orthogonal time frequency space (OTFS) signal receiver are described. An exemplary signal reception technique includes receiving an OTFS modulated wireless signal comprising pilot signal transmissions interspersed with data transmissions, calculating autocorrelation of the wireless signal using the wireless signal and a delayed version of the wireless signal that is delayed by a pre-determined delay, thereby generating an autocorrelation output, processing the autocorrelation filter through a moving average filter to produce a fine timing signal. Another exemplary signal reception technique includes receiving an OTFS modulated wireless signal comprising pilot signal transmissions interspersed with data transmissions, performing an initial automatic gain correction of the received OTFS wireless signal by peak detection and using clipping information, performing coarse automatic gain correction on results of a received and initial automatic gain control (AGC)-corrected signal.
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公开(公告)号：US11632133B2
公开(公告)日：2023-04-18
申请号：US17451251
申请日：2021-10-18
Applicant: Cohere Technologies, Inc.
Inventor： Vamadevan Namboodiri , Ronny Hadani , Stuart Abrams
Abstract: Methods, systems and devices for forward error correction in orthogonal time frequency space (OTFS) communication systems using non-binary low-density parity-check (NB-LDPC) codes are described. One exemplary method for forward error correction includes receiving data, encoding the data via a non-binary low density parity check (NB-LDPC) code, wherein the NB-LDPC code is characterized by a matrix with binary and non-binary entries, modulating the encoded data to generate a signal, and transmitting the signal. Another exemplary method for forward error correction includes receiving a signal, demodulating the received signal to produce data, decoding the data via a NB-LDPC code, wherein the NB-LDPC code is characterized by a matrix with binary and non-binary entries, and providing the decoded data to a data sink.
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公开(公告)号：US11533203B2
公开(公告)日：2022-12-20
申请号：US17445707
申请日：2021-08-23
Applicant: Cohere Technologies, Inc.
Inventor： Vamadevan Namboodiri , Ronny Hadani , James Delfeld
Abstract: Methods, systems and devices for lattice reduction in decision feedback equalizers for orthogonal time frequency space (OTFS) modulation are described. An exemplary wireless communication method, implementable by a wireless communication receiver apparatus, includes receiving a signal comprising information bits modulated using OTFS modulation scheme. Each delay-Doppler bin in the signal is modulated using a quadrature amplitude modulation (QAM) mapping. The method also includes estimating the information bits based on an inverse of a single error covariance matrix of the signal, with the single error covariance matrix being representative of an estimation error for all delay-Doppler bins in the signal.
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公开(公告)号：US11152957B2
公开(公告)日：2021-10-19
申请号：US16651020
申请日：2018-09-29
Applicant: Cohere Technologies, Inc.
Inventor： Vamadevan Namboodiri , Ronny Hadani , Stuart Abrams
Abstract: Methods, systems and devices for forward error correction in orthogonal time frequency space (OTFS) communication systems using non-binary low-density parity-check (NB-LDPC) codes are described. One exemplary method for forward error correction includes receiving data, encoding the data via a non-binary low density parity check (NB-LDPC) code, wherein the NB-LDPC code is characterized by a matrix with binary and non-binary entries, modulating the encoded data to generate a signal, and transmitting the signal. Another exemplary method for forward error correction includes receiving a signal, demodulating the received signal to produce data, decoding the data via a NB-LDPC code, wherein the NB-LDPC code is characterized by a matrix with binary and non-binary entries, and providing the decoded data to a data sink.
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