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

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：US11147087B2

公开(公告)日：2021-10-12

申请号：US16606164

申请日：2018-04-23

Applicant: Cohere Technologies, Inc.

Inventor： Andreas Molisch ,  Ronny Hadani ,  Robert Fanfelle

IPC: H04W72/12 ,  H04B17/309 ,  H04L5/00 ,  H04L25/02

Abstract: Methods, devices and systems for communication techniques that use the quasi-static properties of wireless channels are described. One example method to improve communication performance includes receiving a set of pilots over a transmission channel between the wireless communication apparatus and a far-end communication apparatus, the transmission channel comprising a first portion that is time-invariant and a second portion that is time-variant, processing the received set of pilots to generate an estimate of the first portion, processing the received set of pilots to generate an estimate of the second portion, and performing a communication based on a channel state information that is a weighted combination of a first term based on the estimate of the first portion and a second term based on the estimate of the second portion.

公开(公告)号：US11025377B2

公开(公告)日：2021-06-01

申请号：US16432666

申请日：2019-06-05

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：US10965348B2

公开(公告)日：2021-03-30

申请号：US16338415

申请日：2017-09-29

Applicant: Cohere Technologies, Inc.

Inventor： James Delfeld ,  Christian Ibars Casas ,  Yoav Hebron ,  Ronny Hadani ,  Shlomo Rakib

IPC: H04L5/00 ,  H04B7/01 ,  H04L27/26 ,  H04J11/00 ,  H04W56/00 ,  H04B1/7183

Abstract: A method of reducing peak to average power ratio of uplink transmission includes, assigning a slice of transmission resource to uplink transmission from a user equipment, where all resource elements in the slice have a same Doppler value, mapping data to the slice, performing orthogonal time frequency space transformation to generate time-frequency domain data and processing the time-frequency domain data for transmission.

公开(公告)号：US10938613B2

公开(公告)日：2021-03-02

申请号：US16559485

申请日：2019-09-03

Applicant: Cohere Technologies, Inc.

Inventor： Shlomo Selim Rakib ,  Ronny Hadani

IPC: H04L27/26 ,  H04L1/06 ,  G06F17/14 ,  H04L5/00

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.

公开(公告)号：US10917204B2

公开(公告)日：2021-02-09

申请号：US16273482

申请日：2019-02-12

Applicant: Cohere Technologies, Inc.

Inventor： Shachar Kons ,  Ronny Hadani ,  Yoav Hebron

IPC: H04L5/00 ,  H04L23/02 ,  H04W72/04 ,  H04J4/00 ,  H04W72/12 ,  G01S7/41

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：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.

公开(公告)号：US10892547B2

公开(公告)日：2021-01-12

申请号：US15203728

申请日：2016-07-06

Applicant: Cohere Technologies, Inc.

Inventor： Shlomo Selim Rakib ,  Ronny Hadani

IPC: H01Q1/44 ,  H01Q1/24 ,  H01Q25/00 ,  H01Q9/04 ,  H01Q1/12 ,  H01Q13/08 ,  H01Q19/30

Abstract: Inconspicuous antenna systems configured to include substantially transparent conducting and dielectric materials or open lattice structures. The antenna systems are capable of distinguishing wireless waveforms over a plurality of different polarization states and directions. Polarized antenna elements are assembled into antenna sets, each set with a different directionality. The different directionality sets in turn form the antenna system. Directionality can be achieved by employing different printed antenna like designs, variable length microstrips, Rotman lenses, active phase adjust, metamaterials, and other methods. The antenna system can be widely used in urban environments and installed as visually inconspicuous retrofits over building windows, street lights, air conditioning units, and the like.

公开(公告)号：US10681568B1

公开(公告)日：2020-06-09

申请号：US16041779

申请日：2018-07-21

Applicant: Cohere Technologies, Inc.

Inventor： Ronny Hadani ,  Shlomo Selim Rakib

IPC: H04W24/02 ,  H04L27/26 ,  H04L5/00 ,  H04L25/02 ,  H04W72/08 ,  H04B7/10

Abstract: Fiber, cable, and wireless data channels are typically impaired by reflectors and other imperfections, producing a channel state with echoes and frequency shifts in data waveforms. Here, methods of using pilot symbol waveform bursts to automatically produce a detailed 2D model of the channel state are presented. This 2D channel state can then be used to optimize data transmission. For wireless data channels, an even more detailed 2D model of channel state can be produced by using polarization and multiple antennas in the process. Once 2D channel states are known, the system turns imperfect data channels from a liability to an advantage by using channel imperfections to boost data transmission rates. The methods can be used to improve legacy data transmission modes in multiple types of media, and are particularly useful for producing new types of robust and high capacity wireless communications using non-legacy data transmission methods as well.

公开(公告)号：US10673659B2

公开(公告)日：2020-06-02

申请号：US16512055

申请日：2019-07-15

Applicant: Cohere Technologies, Inc.

Inventor： Ronny Hadani ,  Shachar Kons

IPC: H04W72/00 ,  H04L25/03 ,  H04L25/00 ,  H04L25/02 ,  H04L25/08 ,  H04L27/26 ,  H04L1/00

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.