公开(公告)号：US11742909B2

公开(公告)日：2023-08-29

申请号：US17596233

申请日：2020-06-05

Applicant: Cohere Technologies, Inc.

Inventor： Ronny Hadani ,  Shachar Kons

IPC: H04B7/0456 ,  H04B7/024 ,  H04B7/0452 ,  H04W52/14

CPC classification number: H04B7/0456 ,  H04B7/024 ,  H04B7/0452 ,  H04W52/143

Abstract: Methods, systems and devices for reciprocal geometric precoding are described. One example method includes determining, by a network device, an uplink channel state using reference signal transmissions received from multiple user devices, and generating a precoded transmission waveform for transmission to one or more of the multiple user devices by applying a precoding scheme that is based on the uplink channel state, wherein the uplink channel state completely defines the precoding scheme. In some embodiments, the reference signal transmissions and the precoded transmission waveform are multiplexed using either time-domain multiplexing or frequency-domain multiplexing.

公开(公告)号：US11558157B2

公开(公告)日：2023-01-17

申请号：US17303436

申请日：2021-05-28

Applicant: Cohere Technologies, Inc.

Inventor： Shlomo Selim Rakib ,  Ronny Hadani ,  Richard Benner ,  Robert Fanfelle

IPC: H04L5/00 ,  H01Q21/24 ,  H04B7/06 ,  H04B7/12

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.

公开(公告)号：US11362872B2

公开(公告)日：2022-06-14

申请号：US16946375

申请日：2020-06-18

Applicant: Cohere Technologies, Inc.

Inventor： Ronny Hadani ,  Shlomo Selim Rakib ,  Anthony Ekpenyong ,  Clayton Ambrose ,  Shachar Kons

IPC: H04L27/26 ,  H04L5/00 ,  H04L1/00 ,  H04B7/0413

Abstract: Wireless communication techniques for transmitting and receiving reference signals is described. The reference signals may include pilot signals that are transmitted using transmission resources that are separate from data transmission resources. Pilot signals are continuously transmitted from a base station to user equipment being served. Pilot signals are generated from delay-Doppler domain signals that are processed to obtain time-frequency signals that occupy a two-dimensional lattice in the time frequency domain that is non-overlapping with a lattice corresponding to data signal transmissions.

公开(公告)号：US20220086694A1

公开(公告)日：2022-03-17

申请号：US17309950

申请日：2019-12-31

Applicant: Cohere Technologies, Inc.

Inventor： Shachar Kons ,  Shlomo Selim Rakib ,  Ronny Hadani

IPC: H04W28/16 ,  H04W72/04 ,  H04W72/08 ,  H04W16/24

Abstract: Methods, systems and devices for distributed cooperative operation of wireless cells based on sparse channel representations are described. One example method includes providing, using a server, seamless wireless connectivity in an area in which a plurality of network nodes are organized as clusters, where each network node is configured to provide wireless connectivity via N angular sectors covering a surrounding area, where N is an integer and wherein angular sectors of the plurality of network nodes collectively cover the area; controlling, by the server, network nodes in a cluster to collect channel condition information for the N angular sectors and communicate the channel condition information to the network-side server, and operating the server to use the channel condition information collected from the network nodes in the cluster to control communication for the network nodes in the cluster at a different time or a different frequency or a different spatial direction.

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

IPC: H03M13/11 ,  H03M13/25 ,  H03M13/29 ,  H03M13/39 ,  H03M13/00

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.

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

IPC: H04L5/00 ,  H04L27/26 ,  H04L1/00

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.

公开(公告)号：US20210126750A1

公开(公告)日：2021-04-29

申请号：US17139478

申请日：2020-12-31

Applicant: Cohere Technologies, Inc.

Inventor： Shachar Kons ,  Ronny Hadani ,  Yoav Hebron

IPC: H04L5/00 ,  H04L23/02 ,  H04W72/04 ,  H04J4/00 ,  H04W72/12

Abstract: A method for performing downlink transmissions from a transmitting device to multiple user devices using transmission resources from a multi-dimensional grid of resources is described. The method includes logically partitioning the transmission resources into multiple segments, assigning, to a given user device of the multiple user devices, transmission resources of one or more of the multiple segments, and performing, using at least some of the assigned transmission resources for the given user device, a downlink transmission using an orthogonal time frequency space (OTFS) transformation on data or signals to be transmitted to the given user device.

公开(公告)号：US20200313949A1

公开(公告)日：2020-10-01

申请号：US16607347

申请日：2018-04-24

Applicant: Cohere Technologies, Inc.

Inventor： Ronny Hadani

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

Abstract: A wireless data transmission technique includes encoding information bits as a periodic sequence of quadrature amplitude modulation (QAM) symbols, convolving the periodic sequence with a periodic pulse function, thereby generating a filtered periodic sequence, transforming the filtered periodic sequence to a delay-Doppler domain waveform, converting the delay-Doppler domain waveform to a time domain waveform, and transmitting the time domain waveform.

公开(公告)号：US20200259692A1

公开(公告)日：2020-08-13

申请号：US15776374

申请日：2016-11-17

Applicant: Cohere Technologies

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.

公开(公告)号：US20190342126A1

公开(公告)日：2019-11-07

申请号：US16512055

申请日：2019-07-15

Applicant: Cohere Technologies, Inc.

Inventor： Ronny Hadani ,  Shachar Kons

IPC: H04L25/03 ,  H04L25/02 ,  H04L25/08 ,  H04L1/00 ,  H04L25/00 ,  H04L27/26

Abstract: An iterative two dimension equalizer usable in a receiver of orthogonal time frequency space (OTFS) modulated signals is described. In one configuration of the equalizer, a forward path generates, from received time-frequency domain samples and a channel estimate, estimates of data bits and likelihood numbers associated with the estimates of data bits, generated by delay-Doppler domain processing. In the feedback direction, the estimates of data bits are used to generate symbol estimates and autocorrelation matrix estimate in the time domain. In another configuration, a soft symbol mapper is used in the feedback direction for directly generating the feedback input symbol estimate without having to generate estimates of data bits.