Near-Field Integrated Sensing and Communications: Unlocking Potentials and Shaping the Future

TL;DR

This paper explores the potential of near-field integrated sensing and communications (ISAC) in 6G networks, emphasizing the unique benefits of Extremely Large-Scale Antenna Arrays (ELAA) and spherical wave properties for enhanced communication and sensing capabilities.

Contribution

It systematically analyzes the principles, technologies, and advantages of near-field ISAC, highlighting its transformative potential and outlining future research directions.

Findings

Near-field ISAC offers significant benefits in communication and sensing.

Simulations demonstrate the advantages of near-field ISAC over traditional methods.

The paper identifies open challenges and future research directions in near-field ISAC.

Abstract

The sixth generation (6G) communication networks are featured by integrated sensing and communications (ISAC), revolutionizing base stations (BSs) and terminals. Additionally, in the unfolding 6G landscape, a pivotal physical layer technology, the Extremely Large-Scale Antenna Array (ELAA), assumes center stage. With its expansive coverage of the near-field region, ELAA's electromagnetic (EM) waves manifest captivating spherical wave properties. Embracing these distinctive features, communication and sensing capabilities scale unprecedented heights. Therefore, we systematically explore the prodigious potential of near-field ISAC technology. In particular, the fundamental principles of near-field are presented to unearth its benefits in both communication and sensing. Then, we delve into the technologies underpinning near-field communication and sensing, unraveling possibilities discussed in recent works. We then investigated the advantages of near-field ISAC through rigorous case simulations, showcasing the benefits of near-field ISAC and reinforcing its stature as a transformative paradigm. As we conclude, we confront the open frontiers and chart the future directions for near-field ISAC.