Intelligent Surface Enabled Sensing-Assisted Communication

TL;DR

This paper introduces a novel sensing-assisted communication scheme using an intelligent surface on vehicles to enhance V2X communication, achieving high throughput with low power by jointly optimizing system parameters.

Contribution

It proposes a new ISAC protocol with IOS on vehicles and derives analytical expressions and conditions for optimizing V2X communication performance.

Findings

Achieves high throughput with low transmit power.

Provides a closed-form expression for achievable rate.

Derives conditions for the existence of the sensing and communication phase.

Abstract

Vehicle-to-everything (V2X) communication is expected to support many promising applications in next-generation wireless networks. The recent development of integrated sensing and communications (ISAC) technology offers new opportunities to meet the stringent sensing and communication (S&C) requirements in V2X networks. However, considering the relatively small radar cross section (RCS) of the vehicles and the limited transmit power of the road site units (RSUs), the power of echoes may be too weak to achieve effective target detection and tracking. To handle this issue, we propose a novel sensing-assisted communication scheme by employing an intelligent Omni-surface (IOS) on the surface of the vehicle. First, a two-phase ISAC protocol, including the S&C phase and the communication-only phase, was presented to maximize the throughput by jointly optimizing the IOS phase shifts and the sensing duration. Then, we derive a closed-form expression of the achievable rate which achieves a good approximation. Furthermore, a sufficient and necessary condition for the existence of the S&C phase is derived to provide useful insights for practical system design. Simulation results demonstrate the effectiveness of the proposed sensing-assisted communication scheme in achieving high throughput with low transmit power requirements.