Tomlinson-Harashima precoding in an OTFS communication system

A device for wireless communication, comprising:

• a processor;
• and
• a memory that comprises instructions stored thereupon, wherein the instructions when executed by the processor configure the processor to:
• generate, based on a feedback signal, a two-dimensional estimate of a channel, wherein the two-dimensional estimate is in a delay-Doppler domain that comprises a time delay dimension and a frequency shift dimension;
• determine, based on the two-dimensional estimate, a set of precoding values and a set of perturbation values;
• generate a plurality of perturbed symbols by applying the set of perturbation values to a plurality of user symbols;
• generate a plurality of pre-coded symbols by applying the set of precoding values to the plurality of perturbed symbols;
• generate, based on the plurality of pre-coded symbols, a pre-coded signal that is modulated using an orthogonal time frequency space (OTFS) or an orthogonal frequency division multiplexing (OFDM) modulation scheme;
• and
• transmit, over the channel, the pre-coded signal.

A non-transitory computer readable program storage medium having code stored thereon, the code, when executed by a processor, causing the processor to implement a method for wireless communication, the method comprising:

• generating, based on a feedback signal, a two-dimensional estimate of a channel, wherein the two-dimensional estimate is in a delay-Doppler domain that comprises a time delay dimension and a frequency shift dimension;
• determining, based on the two-dimensional estimate, a set of precoding values and a set of perturbation values;
• generating a plurality of perturbed symbols by applying the set of perturbation values to a plurality of user symbols;
• generating a plurality of pre-coded symbols by applying the set of precoding values to the plurality of perturbed symbols;
• generating, based on the plurality of pre-coded symbols, a pre-coded signal that is modulated using an orthogonal time frequency space (OTFS) or an orthogonal frequency division multiplexing (OFDM) modulation scheme;
• and
• transmitting, over the channel, the pre-coded signal.