Application-Based Coexistence of Different Waveforms on Non-orthogonal Multiple Access

TL;DR

This paper explores the coexistence of different waveforms within the same resource elements under non-orthogonal multiple access, proposing a new application-centric approach with specific use cases like power-balanced NOMA and joint radar-sensing and communication.

Contribution

It introduces a paradigm shift in NOMA towards application-centric waveform coexistence and discusses its potential for next-generation flexible wireless systems.

Findings

Demonstrates coexistence of multiple waveforms in NOMA scenarios

Proposes specific use cases like power-balanced NOMA and joint radar-communication

Reviews prior work on non-orthogonal waveform coexistence

Abstract

The coexistence of different wireless communication systems such as LTE and Wi-Fi by sharing the unlicensed band is well studied in the literature. In these studies, various methods are proposed to support the coexistence of systems, including listen-before-talk mechanism, joint user association and resource allocation. However, in this study, the coexistence of different waveform structures in the same resource elements are studied under the theory of non-orthogonal multiple access. This study introduces a paradigm-shift on NOMA towards the application-centric waveform coexistence. Throughout the paper, the coexistence of different waveforms is explained with two specific use cases, which are power-balanced NOMA and joint radar-sensing and communication with NOMA. In addition, some of the previous works in the literature regarding non-orthogonal waveform coexistence are reviewed. However, the concept is not limited to these use cases. With the rapid development of wireless technology, next-generation wireless systems are proposed to be flexible and hybrid, having different kinds of capabilities such as sensing, security, intelligence, control, and computing. Therefore, the concept of different waveforms' coexistence to meet these concerns are becoming impressive for researchers.