基于OTFS的下一代車聯網新型通信與感知一體化技術

孫春蕾; 李琳佩; 張海君

doi:10.13374/j.issn2095-9389.2022.12.30.002

基于OTFS的下一代車聯網新型通信與感知一體化技術

doi: 10.13374/j.issn2095-9389.2022.12.30.002

1.
北京科技大學計算機與通信工程學院，北京 100083
2.
北京科技大學智能科學與技術學院，北京 100083

基金項目: 國家自然科學基金青年基金資助項目（62201032）；中國博士后科學基金面上資助項目（2022M720417）；中央高校基本科研業務費資助項目（FRF-TP-22-045A1）；北京市青年人才托舉工程資助項目（BYESS2023306）；國家自然科學基金企業聯合基金資助項目（U22B2003）；北京海淀聯合基金資助項目（L212004）；中國高校產學研創新基金資助項目（2021FNA05001）

詳細信息

通訊作者:
E-mail: zhanghaijun@ustb.edu.cn

中圖分類號: TG142.71
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- 文章訪問數: 405
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出版歷程
- 收稿日期: 2022-12-30
- 網絡出版日期: 2023-04-12
- 刊出日期: 2023-10-25

OTFS-enabled integrated sensing and communication techniques for next-generation V2X networks

1.
School of Computer & Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
School of Intelligent Science and Technology, University of Science and Technology Beijing, Beijing 100083, China

More Information

Corresponding author: E-mail: zhanghaijun@ustb.edu.cn

摘要

摘要: 車聯網借助新一代信息通信技術，實現人、車、路、云等的互聯互通. 未來beyond 5G（B5G）和6G將賦予下一代車聯網更極致的通信與感知性能，有效支撐智能駕駛與智慧交通等創新應用. 然而，車輛高速移動帶來的高多普勒效應，極大地增加了現有正交頻分復用（Orthogonal frequency division multiplexing，OFDM）系統的載波間干擾和導頻開銷，尤其是B5G/6G時代毫米波、太赫茲等高頻段的廣泛應用將進一步加劇這一問題. 近年來，正交時頻空間（Orthogonal time frequency space, OTFS）技術由于在抗時頻雙域選擇性衰落方面的顯著優勢受到了業界的廣泛關注. 基于OTFS實現通信與感知一體化成為了車聯網領域的研究熱點. 本文旨在研究基于OTFS的車聯網通感一體化的系統原理、關鍵技術、應用模式及技術挑戰. 首先，在現有OTFS通信系統的基礎上，探討OTFS通感一體化的系統架構、實現原理以及通信和感知性能. 然后，介紹OTFS技術的國內外研究現狀，并進一步從物理層幀結構、導頻機制等方面討論OTFS通感一體化的難點與關鍵技術. 最后，結合實際場景，分析OTFS在車聯網通感一體化中的應用及面臨的主要挑戰.
- 正交時頻空間調制 /
- 車聯網 /
- 通信與感知一體化 /
- B5G/6G /
- 時延-多普勒
Abstract: The vehicle-to-everything (V2X) network has the potential to revolutionize the way we interact with vehicles and the surrounding. By utilizing innovative information and communication technologies, V2X networks can connect human beings, vehicles, roadside units, and even the cloud. In the near future, beyond 5G (B5G) and 6G technologies will enable the next-generation V2X networks to achieve superior communication and sensing capabilities, which is expected to offer advanced technologies such as intelligent driving and transportation. However, the strong Doppler effects arising from the high mobility of vehicles may lead to significant inter-carrier interference and pilot overheads in the existing orthogonal frequency division multiplexing (OFDM) systems, particularly as the millimeter wave and terahertz technologies dominate the B5G/6G era. In recent years, orthogonal time frequency space (OTFS) techniques have attracted attention owing to their ability to resist doubly-selective fading. In addition, the integrated sensing and communication (ISAC) based on OTFS (OTFS-ISAC) has emerged as a promising approach for V2X networks. In this context, our objective is to investigate the system structure, application and challenges of OTFS-ISAC in V2X networks, along with the related key techniques such as frame structure, pilot design and signal processing. First, we will explore the structures and fundamental theories of OTFS-ISAC systems, followed by the evaluation of communication and sensing performance. In particular, we will investigate the system architecture of OTFS-ISAC in monostatic and bistatic radar modes, respectively. Secondly, we will provide an overview of the state-of-the-art of OTFS techniques and further discuss the challenges and key techniques of OTFS-ISAC concerning the frame structure in the physical layer, pilot mechanism design, communication and radar signal analyses, etc. Finally, we will examine the case studies of OTFS-ISAC utilization in V2X networks to address corresponding major issues such as the inadequacy of Doppler resolution, low overhead beam scanning and target detection, and cooperative resource management. The ISAC system is in developmental stages, and this is the first comprehensive review that investigates the OTFS-ISAC system in detail. Although OTFS-ISAC offers significant advantages over OFDM-enabled ISAC in V2X characterized by high mobility, it faces numerous challenges in practical applications, including the well-known fractional Doppler effect and high peak-to-average ratio. However, with continuous development and technological advancements, it is anticipated that the OTFS-ISAC system will gain wide acceptance.
- OTFS /
- V2X /
- integrated sensing and communication /
- B5G/6G /
- delay-Doppler

HTML全文

圖 1 OTFS 通信系統框圖

Figure 1. Schematic diagram of the orthogonal time frequency space modulation

下載: 全尺寸圖片幻燈片

圖 2 單站雷達模式下的OTFS-ISAC系統架構圖

Figure 2. System architecture of integrated sensing and communication based on orthogonal time frequency space technique in monostatic radar mode

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圖 3 雙站雷達模式下的OTFS-ISAC系統架構. (a)通信和雷達接收端為不同節點；(b)通信和雷達接收端為同一節點

Figure 3. System architecture of the integrated sensing and communication system based on orthogonal time frequency space technique in bistatic radar mode: (a) communication and radar receivers are located at two different nodes; (b) communication and radar receivers are located at the same node

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圖 4 OTFS在V2X-ISAC中的應用示例

Figure 4. Application of the orthogonal time frequency space technique in V2X-ISAC

下載: 全尺寸圖片幻燈片

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