Sensing in Bistatic ISAC Systems With Clock Asynchronism: A signal processing perspective [Special Issue on Signal Processing for the Integrated Sensing and Communications Revolution]

IF 9.4 1区工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Signal Processing Magazine Pub Date : 2024-11-27 DOI:10.1109/MSP.2024.3418725

Kai Wu;Jacopo Pegoraro;Francesca Meneghello;J. Andrew Zhang;Jesus O. Lacruz;Joerg Widmer;Francesco Restuccia;Michele Rossi;Xiaojing Huang;Daqing Zhang;Giuseppe Caire;Y. Jay Guo

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Abstract

Integrated Sensing And Communication (ISAC) has been identified as a pillar usage scenario for the impending 6G era. Bi-static sensing, a major type of sensing in ISAC, is promising to expedite ISAC in the near future, as it requires minimal changes to the existing network infrastructure. However, a critical challenge for bi-static sensing is clock asynchronism due to the use of different clocks at far-separated transmitters and receivers. This causes the received signal to be affected by time-varying random phase offsets, severely degrading, or even failing, direct sensing. Hence, to effectively enable ISAC, considerable research has been directed toward addressing the clock asynchronism issue in bi-static sensing. This paper provides an overview of the issue and existing techniques developed in an ISAC background. Based on the review and comparison, we also draw insights into the future research directions and open problems, aiming to nurture the maturation of bi-static sensing in ISAC.

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具有时钟异步性的双向 ISAC 系统中的传感：信号处理视角[综合传感与通信革命信号处理特刊]

综合传感与通信（ISAC）已被确定为即将到来的 6G 时代的支柱应用场景。双静态传感是 ISAC 中的一种主要传感类型，有望在不久的将来加快 ISAC 的发展，因为它只需对现有网络基础设施进行最小程度的改动。然而，双静态传感面临的一个关键挑战是时钟不同步，因为相距甚远的发射器和接收器使用不同的时钟。这会导致接收信号受到时变随机相位偏移的影响，严重降低直接传感的性能，甚至使其失效。因此，为了有效启用 ISAC，大量研究都针对解决双静态传感中的时钟不同步问题。本文概述了这一问题以及在 ISAC 背景下开发的现有技术。在回顾和比较的基础上，我们还对未来的研究方向和有待解决的问题提出了见解，旨在促进 ISAC 中双静态传感技术的成熟。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Signal Processing Magazine 工程技术-工程：电子与电气

CiteScore

27.20

自引率

0.70%

发文量

123

审稿时长

6-12 weeks

期刊介绍： EEE Signal Processing Magazine is a publication that focuses on signal processing research and applications. It publishes tutorial-style articles, columns, and forums that cover a wide range of topics related to signal processing. The magazine aims to provide the research, educational, and professional communities with the latest technical developments, issues, and events in the field. It serves as the main communication platform for the society, addressing important matters that concern all members.