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    ACHIEVING SYNCHRONIZATION IN AN ORTHOGONAL TIME FREQUENCY SPACE SIGNAL RECEIVER
    2.
    发明申请
    ACHIEVING SYNCHRONIZATION IN AN ORTHOGONAL TIME FREQUENCY SPACE SIGNAL RECEIVER 审中-公开

    公开(公告)号：US20200287672A1

    公开(公告)日：2020-09-10

    申请号：US16645585

    申请日：2018-09-14

    Applicant: Cohere Technologies, Inc.

    Inventor： Devan Namboodiri ,  Karl Sanders ,  Yaron Rozenbaum ,  James Delfeld

    IPC: H04L5/00 ,  H04L27/26 ,  H04L27/156 ,  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.

    Windowed sequence for random access method and apparatus
    3.
    发明授权
    Windowed sequence for random access method and apparatus 有权

    公开(公告)号：US10568143B2

    公开(公告)日：2020-02-18

    申请号：US15937701

    申请日：2018-03-27

    Applicant: Cohere Technologies, Inc.

    Inventor： James Delfeld ,  Ronny Hadani ,  Konstantinos Dimou

    IPC: H04W74/08 ,  H04L5/00 ,  H04L27/26

    Abstract: Methods, devices and systems for generating physical random access channel sequences that can be used to efficiently access a wireless network are disclosed. One exemplary method of accessing a wireless network includes generating a repeated orthogonal sequence by repeating a base orthogonal sequence, generating a random access sequence by applying a window function to the repeated orthogonal sequence, and accessing the wireless network using a random access procedure by selectively using the random access sequence. In an example, the base orthogonal sequence may be a Zadoff-Chu sequence. In another example, the window function may be a root-Hamming window.

    Co-existence of orthogonal time frequency space and long term evolution systems
    4.
    发明授权
    Co-existence of orthogonal time frequency space and long term evolution systems 有权

    公开(公告)号：US11418300B2

    公开(公告)日：2022-08-16

    申请号：US17251960

    申请日：2019-06-12

    Applicant: Cohere Technologies, Inc.

    Inventor： Christian Ibars Casas ,  James Delfeld ,  Yoav Hebron ,  Shachar Kons

    IPC: H04L5/00 ,  H04L27/26 ,  H04B7/0456 ,  H04W4/06 ,  H04W72/04

    Abstract: Co-existence between an Orthogonal Time Frequency Space (OTFS) modulation system and a Long Term Evolution (LTE) system is achieved by generating a number of transmission beams for a first group of user equipment operating using LTE, and a second group of user equipment operating using the OTFS protocol, and transmitting a first group of data packets formatted according to the LTE protocol to the first group of user equipment and a second group of data packets formatted according to the OTFS protocol to the second group of user equipment. The transmissions are performed by precoding and modulating the first group of data packets according to an LTE modulation scheme, and precoding and modulating the second group of data packets according to an OTFS modulation scheme.

    Achieving synchronization in an orthogonal time frequency space signal receiver
    5.
    发明授权
    Achieving synchronization in an orthogonal time frequency space signal receiver 有权

    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.

    Lattice reduction in orthogonal time frequency space modulation
    6.
    发明授权
    Lattice reduction in orthogonal time frequency space modulation 有权

    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

    IPC: H04L27/06 ,  H04L25/03 ,  H04L1/06 ,  H04L5/00 ,  H04L27/26

    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.

    SCHEDULING MULTI-USER MIMO TRANSMISSIONS IN FIXED WIRELESS ACCESS SYSTEMS
    8.
    发明申请
    SCHEDULING MULTI-USER MIMO TRANSMISSIONS IN FIXED WIRELESS ACCESS SYSTEMS 有权

    公开(公告)号：US20210058114A1

    公开(公告)日：2021-02-25

    申请号：US16979020

    申请日：2019-03-08

    Applicant: Cohere Technologies, Inc.

    Inventor： Andreas Molisch ,  Robert Fanfelle ,  Saurabh Misra ,  Paul Lind ,  James Delfeld

    IPC: H04B7/026 ,  H04W72/12 ,  H04L5/00 ,  H04B7/0452 ,  H04B7/06

    Abstract: Described are devices, systems and methods for scheduling multi-user (MU) multiple input multiple output (MIMO) transmissions in a fixed wireless access (FWA) system. One method for scheduling a large number of user devices in a wireless communication system includes a preselection process to pare down the number of user devices to be simultaneously scheduled, and then scheduling that subset of users. In an example, and assuming each user device communicates over a corresponding wireless channel, the preselection process includes determining a number of sets based on a first characteristic of the wireless channels, where each set includes at least one user device, and then determining a subset of user devices by selecting at most one user device from each of the sets. The scheduling of the selected subset of users is based on a scheduling algorithm and a second characteristic of the wireless channels.

    Achieving synchronization in an orthogonal time frequency space signal receiver
    10.
    发明授权
    Achieving synchronization in an orthogonal time frequency space signal receiver 有权

    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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