Delay-Doppler Reversal for OTFS System in Doubly-selective Fading Channels

TL;DR

This paper introduces a delay-Doppler reversal (DDR) technique for OTFS systems that enhances performance and reduces complexity in doubly-selective fading channels, outperforming traditional receivers.

Contribution

It proposes a novel DDR technology for OTFS, providing a low-complexity, high-performance receiver design for doubly-selective fading channels.

Findings

DDR outperforms traditional receivers in simulations

Reduced computational complexity compared to direct processing

Significant performance gains in doubly-selective fading channels

Abstract

The recent proposed orthogonal time frequency space (OTFS) modulation shows signifcant advantages than conventional orthogonal frequency division multiplexing (OFDM) for high mobility wireless communications. However, a challenging problem is the development of effcient receivers for practical OTFS systems with low complexity. In this paper, we propose a novel delay-Doppler reversal (DDR) technology for OTFS system with desired performance and low complexity. We present the DDR technology from a perspective of two-dimensional cascaded channel model, analyze its computational complexity and also analyze its performance gain compared to the direct processing (DP) receiver without DDR. Simulation results demonstrate that our proposed DDR receiver outperforms traditional receivers in doubly-selective fading channels.