Performance Evaluation of OTFS Over Measured V2V Channels at 60 GHz

TL;DR

This study evaluates OTFS modulation in realistic 60 GHz vehicular channels, highlighting the trade-offs between equalization complexity and diversity gains, with results showing limited overall improvements in certain conditions.

Contribution

First comprehensive analysis of OTFS performance over measured millimeter wave V2V channels, revealing the impact of channel conditions on OTFS effectiveness.

Findings

OTFS performance varies significantly with channel conditions.

In easy-to-equalize channels, OTFS offers minimal gains.

In challenging channels, OTFS provides noticeable but limited improvements.

Abstract

This paper presents an analysis of the Orthogonal Time Frequency Space (OTFS) modulation scheme when applied to realistic vehicular channel situations. OTFS modulates symbols in delay-Doppler domain, hoping to exploit diversity in both. The penalty for doing this is the requirement of complex interference cancellation equalizers, as this domain incurs a strong amount of intercarrier and intersymbol interference. We conduct this analysis using measured millimeter wave vehicular channels, and we assume typical physical layer settings for a performance analysis. Our results show that there is a challenging trade-off between channel conditions that are easy to equalize and channel conditions that allow OFTS to exploit the two-dimensional diversity. In the first case we observe a good overall performance that is barely enhanced by employing OTFS. In the second case performance gain through OTFS is visible, yet with a bad overall performance.