Error Performance of Rectangular Pulse-shaped OTFS with Practical Receivers

TL;DR

This paper analyzes the error performance of rectangular pulse-shaped OTFS with practical receivers, highlighting the impact of receiver filtering and interference in the delay-Doppler domain, which causes an error floor.

Contribution

It provides an exact interference analysis for practical OTFS receivers considering bandpass filtering, revealing error floors caused by interference in the delay-Doppler domain.

Findings

Severe contamination of information symbols in certain DD regions.

Existence of an error floor in practical OTFS systems.

Impact of receiver RF filtering on OTFS performance.

Abstract

In this letter, we investigate error performance of rectangular pulse-shaped orthogonal time frequency space (OTFS) modulation with a practical receiver. Specifically, we consider an essential bandpass filter at receiver RF front-end, which has been ignored in existing works. We analyse the effect of rectangular pulses on practical OTFS receiver performance, and derive the exact forms of interference in delay-Doppler (DD) domain. We demonstrate that the transmitted information symbols in certain regions of the DD domain are severely contaminated. As a result, there is an error floor in the receiver error performance, which needs to be addressed for such OTFS waveform in practical systems.