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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.
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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.
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公开(公告)号：US10855425B2
公开(公告)日：2020-12-01
申请号：US16460851
申请日：2019-07-02
Applicant: Cohere Technologies, Inc.
Inventor： Shachar Kons , Michail Tsatsanis
Abstract: A wireless communication technique to improve channel estimation using pilot signals includes receiving data symbols for transmission over a wireless communication channel using multiple antenna ports, generating a plurality of scrambling sequences, each corresponding to one of the multiple antenna ports, mapping, for each antenna port, a corresponding pilot signal to time and frequency transmission resources using a corresponding scrambling sequence, multiplexing a first input from the data symbols and a second input from the mapping of the corresponding pilot signal to generate an output signal, and transmitting the output signal over a wireless communication channel.
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公开(公告)号：US20190342136A1
公开(公告)日：2019-11-07
申请号：US15779796
申请日：2016-12-09
Applicant: Cohere Technologies
Inventor： Ronny Hadani , Shlomo Selim Rakib , Anton Monk , Michail Tsatsanis , Yoav Hebron
Abstract: A wireless communication method includes generating a pilot signal that is represented using a complex exponential signal having a first linear phase in a time dimension and a second linear phase in a frequency dimension; and transmitting the pilot signal over a wireless communication channel using transmission resources that are designated for pilot signal transmission in a legacy transmission network such as a Long Term Evolution (LTE) network.
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公开(公告)号：US20240187298A1
公开(公告)日：2024-06-06
申请号：US18409482
申请日：2024-01-10
Applicant: Cohere Technologies, Inc.
Inventor： Ronny Hadani , Shlomo Selim Rakib , Anton Monk , Michail Tsatsanis , Yoav Hebron
IPC: H04L27/32
CPC classification number: H04L27/32
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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Patent Agency Ranking
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.
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公开(公告)号：US20200186397A1
公开(公告)日：2020-06-11
申请号：US16324102
申请日：2017-08-14
Applicant: Cohere Technologies, Inc.
Inventor： Michail Tsatsanis , Christian Ibars Casas
Abstract: A wireless communication method for receiving an orthogonal time frequency space (OTFS) modulated signal includes receiving the OTFS signal over a wireless communication channel, dividing the receiving OTFS signal along a delay-dimension into a plurality of segments, performing, for each segment, channel estimation independent of channel estimation for other segments to generate a plurality of channel estimates, performing, for each segment, channel equalization using a corresponding channel estimate from the plurality of channel estimates to generate a channel-equalized symbol stream, and generating information bits from the channel-equalized symbol stream.
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公开(公告)号：US20190327054A1
公开(公告)日：2019-10-24
申请号：US16460851
申请日：2019-07-02
Applicant: Cohere Technologies, Inc.
Inventor： Shachar Kons , Michail Tsatsanis
Abstract: A wireless communication technique to improve channel estimation using pilot signals includes receiving data symbols for transmission over a wireless communication channel using multiple antenna ports, generating a plurality of scrambling sequences, each corresponding to one of the multiple antenna ports, mapping, for each antenna port, a corresponding pilot signal to time and frequency transmission resources using a corresponding scrambling sequence, multiplexing a first input from the data symbols and a second input from the mapping of the corresponding pilot signal to generate an output signal, and transmitting the output signal over a wireless communication channel.
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公开(公告)号：US20210351880A1
公开(公告)日：2021-11-11
申请号：US17443004
申请日：2021-07-19
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：US10826728B2
公开(公告)日：2020-11-03
申请号：US16324102
申请日：2017-08-14
Applicant: Cohere Technologies, Inc.
Inventor： Michail Tsatsanis , Christian Ibars Casas
Abstract: A wireless communication method for receiving an orthogonal time frequency space (OTFS) modulated signal includes receiving the OTFS signal over a wireless communication channel, dividing the receiving OTFS signal along a delay-dimension into a plurality of segments, performing, for each segment, channel estimation independent of channel estimation for other segments to generate a plurality of channel estimates, performing, for each segment, channel equalization using a corresponding channel estimate from the plurality of channel estimates to generate a channel-equalized symbol stream, and generating information bits from the channel-equalized symbol stream.
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