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.
翻译:近期综合遥感和通信(ISAC)技术的发展为满足V2X网络的严格遥感和通信(S&C)要求提供了新的机会。不过,考虑到车辆的雷达截面相对较小,公路站单位的传输功率有限,回声的力量可能太弱,无法实现有效的目标探测和跟踪。为了处理这一问题,我们提议了一个新的遥感辅助通信计划,在车辆表面使用智能的表面(IOS)来提供一种新的遥感辅助通信计划。首先,提出了两阶段的ISAC协议,包括S&C阶段和仅通信阶段,目的是通过共同优化IOS阶段的移动和感测时间,最大限度地扩大吞吐量。然后,我们从封闭形式上表达能够实现良好近似的可实现的速率。此外,为S&C阶段的存在提供了充足和必要的条件,以便为实用的系统设计提供有用的洞察力。模拟结果表明,拟议的ISAC协议,包括S&C阶段和仅通信阶段,通过联合优化IOS阶段的转变和感测时间长度,从而通过高功率传输计划实现拟议的遥感辅助通信计划的有效性。