Wireless Communications in Doubly Selective Channels with Domain Adaptivity

TL;DR

This paper investigates adaptive domain selection and equalization strategies in OTFS-based wireless communication systems to improve performance in doubly selective channels with varying time and frequency characteristics.

Contribution

It introduces a domain-adaptive system design framework that dynamically chooses optimal domains for modulation and equalization based on channel conditions.

Findings

Enhanced performance through adaptive domain selection

Reduced equalization complexity in doubly selective channels

Framework for future research in domain-adaptive wireless systems

Abstract

Wireless communications are significantly impacted by the propagation environment, particularly in doubly selective channels with variations in both time and frequency domains. Orthogonal Time Frequency Space (OTFS) modulation has emerged as a promising solution; however, its high equalization complexity, if performed in the delay-Doppler domain, limits its universal application. This article explores domain-adaptive system design, with an emphasis on adaptive equalization, while also discussing modulation and pilot placement strategies. It investigates the dynamic selection of best-fit domains based on channel conditions to enhance performance across diverse environments. We examine channel domain connections, signal designs, and equalization techniques with domain adaptivity, and highlight future research opportunities.