Orthogonal time frequency space modulation is a two dimensional (2D) delay-Doppler domain waveform. It uses inverse symplectic Fourier transform (ISFFT) to spread the signal in time-frequency domain. To extract diversity gain from 2D spreaded signal, advanced receivers are required. In this work, we investigate a low complexity linear minimum mean square error receiver which exploits sparsity and quasi-banded structure of matrices involved in the demodulation process which results in a log-linear order of complexity without any performance degradation of BER.
@article{arxiv.1910.01350,
title = {Low Complexity LMMSE Receiver for OTFS},
author = {Shashank Tiwari and Suvra Sekhar das and Vivek Rangamgari},
journal= {arXiv preprint arXiv:1910.01350},
year = {2019}
}