Terahertz-Band Integrated Sensing and Communications: Challenges and Opportunities

TL;DR

This paper explores the integration of sensing and communication in the terahertz band for 6G networks, highlighting challenges, technological solutions, and future research directions for high-speed, low-latency wireless systems.

Contribution

It provides a comprehensive overview of THz ISAC, discussing key design challenges and potential technological solutions including antenna design, hybrid beamforming, and machine learning integration.

Findings

Identifies key challenges like beam split and near-field effects.

Discusses potential solutions such as hybrid beamforming and ML techniques.

Highlights research opportunities in channel estimation and waveform design.

Abstract

The sixth generation (6G) wireless networks aim to achieve ultra-high data transmission rates, very low latency and enhanced energy-efficiency. To this end, terahertz (THz) band is one of the key enablers of 6G to meet such requirements. The THz-band systems are also quickly emerging as high-resolution sensing devices because of their ultra-wide bandwidth and very narrow beamwidth. As a means to efficiently utilize spectrum and thereby save cost and power, THz integrated sensing and communications (ISAC) paradigm envisages a single integrated hardware platform with a common signaling mechanism. However, ISAC at THz-band entails several design challenges such as beam split, range-dependent bandwidth, near-field beamforming, and distinct channel model. This article examines the technologies that have the potential to bring forth ISAC and THz transmission together. In particular, it provides an overview of antenna and array design, hybrid beamforming, integration with reflecting surfaces and data-driven techniques such as machine learning. These systems also provide research opportunities in developing novel methodologies for channel estimation, near-field beam split, waveform design, and beam misalignment.