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公开(公告)号：US11456908B2
公开(公告)日：2022-09-27
申请号：US17188810
申请日：2021-03-01
Applicant: Cohere Technologies, Inc.
Inventor： Shlomo Selim Rakib , Ronny Hadani
Abstract: A system and method for orthogonal time frequency space communication and waveform generation. The method includes receiving a plurality of information symbols and encoding an N×M array containing the plurality of information symbols into a two-dimensional array of modulation symbols by spreading each of the plurality of information symbols with respect to both time and frequency. The two-dimensional array of modulation symbols is then transmitted using M mutually orthogonal waveforms included within M frequency sub-bands.
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公开(公告)号：US11362866B2
公开(公告)日：2022-06-14
申请号：US17188845
申请日：2021-03-01
Applicant: Cohere Technologies, Inc.
Inventor： Shachar Kons , Ronny Hadani , Michail Tsatsanis
Abstract: In a transmitter apparatus, a known reference signal is superimposed on top of a data signal that is typically not known a priori to a receiver and the combined signal is transmitted. At a receiver, an iterative channel estimation and equalization technique is used to recover the reference signal and the unknown data signal. In the initial iteration, the known reference signal is recovered by treating the data signal as noise. Subsequent iterations are used to improve estimation of received reference signal and the unknown data signal.
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公开(公告)号：US11324008B2
公开(公告)日：2022-05-03
申请号：US16638873
申请日：2018-08-14
Applicant: Cohere Technologies, Inc.
Inventor： Yoav Hebron , Christian Ibars Casas , Ronny Hadani , Shachar Kons
Abstract: Methods, systems and devices for providing transmission resources that achieve transmission diversity while reducing pilot signal overhead are described. An exemplary wireless communication method may be implemented in a wireless communication system in which transmission resources are allocated on a per physical resource block (PRB) basis, where a PRB corresponds to a two dimensional resource pattern comprising a first number of subcarriers along a frequency dimension and a second number time slots along a time dimension. The method includes logically dividing subcarriers in each PRB into an integer number of sub-groups of subcarriers, wherein the integer number is greater than one, allocating, to a transmission, transmission resources corresponding to one or more of the sub-groups of subcarriers, performing the transmission in the wireless communication system.
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公开(公告)号：US20210399852A1
公开(公告)日：2021-12-23
申请号：US17303436
申请日：2021-05-28
Applicant: Cohere Technologies, Inc.
Inventor： Shlomo Selim Rakib , Ronny Hadani , Richard Benner , Robert Fanfelle
Abstract: A fixed wireless access system is implemented using orthogonal time frequency space multiplexing (OTFS). Data transmissions to/from different devices share transmission resources using—delay Doppler multiplexing, time-frequency multiplexing, multiplexing at stream and/or layer level, and angular multiplexing. Time-frequency multiplexing is achieved by dividing the time-frequency plan into subgrids, with the subsampled time frequency grid being used to carry the OTFS data. Antenna implementations include a hemispherical antenna with multiple antenna elements arranged in an array to achieve multiplexing.
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公开(公告)号：US11190379B2
公开(公告)日：2021-11-30
申请号：US16726639
申请日：2019-12-24
Applicant: Cohere Technologies, Inc.
Inventor： Ronny Hadani
IPC: H04L25/03 , H04L5/00 , H04L27/148 , H04L27/26
Abstract: One example wireless communication method includes transforming an information signal to a discrete sequence, where the discrete sequence is a Zak transformed version of the information signal, generating a first ambiguity function corresponding to the discrete sequence, generating a second ambiguity function by pulse shaping the first ambiguity function, generating a waveform corresponding to the second ambiguity function, and transmitting the waveform over a wireless communication channel. Another communication method includes transforming an information signal to a discrete lattice domain signal, shaping bandwidth and duration of the discrete lattice domain signal by a two-dimensional filtering procedure to generate a filtered information signal, generating, using a Zak transform, a time domain signal from the filtered information signal, and transmitting the time domain signal over a wireless communication channel.
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Patent Agency Ranking
公开(公告)号：US20210306197A1
公开(公告)日：2021-09-30
申请号：US17188810
申请日：2021-03-01
Applicant: Cohere Technologies, Inc.
Inventor： Shlomo Selim Rakib , Ronny Hadani
Abstract: A system and method for orthogonal time frequency space communication and waveform generation. The method includes receiving a plurality of information symbols and encoding an N×M array containing the plurality of information symbols into a two-dimensional array of modulation symbols by spreading each of the plurality of information symbols with respect to both time and frequency. The two-dimensional array of modulation symbols is then transmitted using M mutually orthogonal waveforms included within M frequency sub-bands.
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公开(公告)号：US11070329B2
公开(公告)日：2021-07-20
申请号：US15758322
申请日：2016-09-07
Applicant: Cohere Technologies, Inc.
Inventor： Ronny Hadani , Anton Monk , Shlomo Selim Rakib , Michail Tsatsanis
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.
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公开(公告)号：US11038733B2
公开(公告)日：2021-06-15
申请号：US15776374
申请日：2016-11-17
Applicant: Cohere Technologies, Inc.
Inventor： Ronny Hadani , Shlomo Selim Rakib , Anton Monk , Michail Tsatsanis , Yoav Hebron
IPC: H04L27/26
Abstract: Orthogonal Time Frequency Space (OTFS) is a novel modulation scheme with significant benefits for 5G systems. The fundamental theory behind OTFS is presented in this paper as well as its benefits. We start with a mathematical description of the doubly fading delay-Doppler channel and develop a modulation that is tailored to this channel. We model the time varying delay-Doppler channel in the time-frequency domain and derive a new domain (the OTFS domain) where we show that the channel is transformed to a time invariant one and all symbols see the same SNR. We explore aspects of the modulation like delay and Doppler resolution, and address design and implementation issues like multiplexing multiple users and evaluating complexity. Finally we present some performance results where we demonstrate the superiority of OTFS.
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99.发明授权公开(公告)号：US11038636B2
公开(公告)日：2021-06-15
申请号：US16793469
申请日：2020-02-18
Applicant: Cohere Technologies, Inc.
Inventor： Ronny Hadani , Shlomo Selim Rakib
Abstract: A method for modulating data for transmission within a communication system. The method includes establishing a time-frequency shifting matrix of dimension N×N, wherein N is greater than one. The method further includes combining the time-frequency shifting matrix with a data frame to provide an intermediate data frame. A transformed data matrix is provided by permuting elements of the intermediate data frame. A modulated signal is generated in accordance with elements of the transformed data matrix.
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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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