Orthogonal Time Frequency Space (OTFS) Modulation for Wireless Communications

TL;DR

This paper explores OTFS modulation, a novel multi-carrier scheme that multiplexes symbols in the delay-Doppler domain, offering advantages over traditional OFDM for wireless communications.

Contribution

It provides a comprehensive analysis of OTFS modulation, including signal detection, performance evaluation, and applications, derived from the discrete Zak transform.

Findings

OTFS effectively handles delay-Doppler channel characteristics.

OTFS outperforms OFDM in high-mobility scenarios.

The paper outlines future research directions for OTFS.

Abstract

Orthogonal time frequency space (OTFS) modulation is a recently proposed multi-carrier transmission scheme, which innovatively multiplexes the information symbols in the delay-Doppler (DD) domain instead of the conventional time-frequency (TF) domain. The DD domain symbol multiplexing gives rise to a direct interaction between the DD domain information symbols and DD domain channel responses, which are usually quasi-static, compact, separable, and potentially sparse. Therefore, OTFS modulation enjoys appealing advantages over the conventional orthogonal frequency-division multiplexing (OFDM) modulation for wireless communications. In this thesis, we investigate the related subjects of OTFS modulation for wireless communications, specifically focusing on its signal detection, performance analysis, and applications. These important aspects are discussed based on the review of the state-of-the-art and a detailed derivation of OTFS modulation from the discrete Zak transform (DZT). Finally, a summary of future research directions on OTFS modulation are also provided.