公开(公告)号：US10938602B2

公开(公告)日：2021-03-02

申请号：US16303590

申请日：2017-05-19

Applicant: Cohere Technologies, Inc.

Inventor： Shachar Kons ,  Ronny Hadani ,  Michail Tsatsanis

IPC: H03H7/30 ,  H03H7/40 ,  H03K5/159 ,  H04L25/02 ,  H04L5/00 ,  H04L27/01 ,  H04L27/34

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.

公开(公告)号：US20200322202A1

公开(公告)日：2020-10-08

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

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：US10355887B2

公开(公告)日：2019-07-16

申请号：US16148922

申请日：2018-10-01

Applicant: Cohere Technologies, Inc.

Inventor： Ronny Hadani ,  Shachar Kons

IPC: H04L25/02 ,  H04L25/03 ,  H04L25/00 ,  H04L25/08 ,  H04L1/00 ,  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.