Cohere Technologies, Inc.

Jim Delfeld

Shlomo Selim Rakib

Ronny Hadani

Michail Konstantinos Tsatsanis

Robert Fanfelle

Yoav Hebron

Clayton Ambrose

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.

Channel acquisition using orthogonal time frequency space modulated pilot signals

A method for signal transmission using precoded symbol information involves estimating a two-dimensional model of a communication channel in a delay-Doppler domain. A perturbation vector is determined in a delay-time domain wherein the delay-time domain is related to the delay-Doppler domain by an FFT operation. User symbols are modified based upon the perturbation vector so as to produce perturbed user symbols. A set of Tomlinson-Harashima precoders corresponding to a set of fixed times in the delay-time domain may then be determined using a delay-time model of the communication channel. Precoded user symbols are generated by applying the Tomlinson-Harashima precoders to the perturbed user symbols. A modulated signal is then generated based upon the precoded user symbols and provided for transmission over the communication channel.

Tomlinson-harashima precoding in an OTFS communication system

Channel acquistion using orthogonal time frequency space modulated pilot signal

Tomlinson-Harashima precoding in an OTFS communication system

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Jim Delfeld