| 摘要: |
| 车联网（Vehicle to Everything，V2X）通信被认为是未来无线通信网络最重要的应用之一。然而，车辆在高速移动时引起的高多普勒频移会严重恶化V2X通信链路的性能。正交时频空（Orthogonal Time Frequency Space,OTFS）调制技术可以将时间和频率选择性信道转换为时延-多普勒（Delay-Doppler,DD）域的非选择性信道，从而显著提高无线通信系统在高移动性场景下的性能，在V2X通信中具有重要的应用价值。但OTFS调制技术极大地增加了系统接收端的复杂度，研究低复杂度信号检测算法成为了新一代无线通信系统采用OTFS调制的关键问题之一。为此，综述了面向车联网V2X通信的OTFS信号检测算法。首先介绍了OTFS系统模型，然后概述了现有的低复杂度OTFS信号检测算法，并将其分为线性检测算法、消息传递（Message Passing，MP）检测算法及其改进算法、基于神经网络的检测算法3类，最后探讨了V2X通信中OTFS信号检测目前所面临的技术挑战与未来的发展趋势。 |
| 关键词: 车联网 高速移动通信 正交时频空（OTFS） 信号检测 |
| DOI：10.20079/j.issn.1001-893x.230818001 |
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| 基金项目:重庆市自然科学基金项目（CSTB2023NSCQ-MSX0025） |
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| A Survey on OTFS Signal Detection Algorithms for V2X Communications |
| WANG Jian,WANG Jizhe,SHEN Zhenghua,GONGLI Huiqian,GAO Ge,LIAO Yong |
| (1.Information Communication Branch Company,State Grid Chongqing Electric Power Company,Chongqing 401120,China;2.School of Microelectronics and Communication Engineering,Chongqing University,Chongqing 400044,China) |
| Abstract: |
| Vehicle to Everything(V2X) communication is considered to be one of the most important applications for future wireless communication networks.However,the high Doppler shift caused by vehicles moving at high speeds can seriously deteriorate the performance of on-board communication links.Orthogonal time frequency space(OTFS) modulation technology can convert Time and frequency selective channels to non-selective channels in the delay-Doppler(DD) domain.Therefore,the performance of wireless communication system in high mobility scenario is significantly improved,and it has important application value in V2X communication.However,OTFS modulation technology greatly increases the complexity of the receiving end of the system,and the study of low-complexity OTFS signal detection algorithm has become one of the key issues in the adoption of OTFS modulation in the new generation wireless communication system.Therefore,the authors review OTFS signal detection algorithms for V2X communication.They first introduces the OTFS system model,and then summarizes the existing low-complexity OTFS signal detection algorithms,which are divided into three categories,namely linear detection algorithm,message passing(MP) detection algorithm and its improved algorithm,and detection algorithm based on neural network.Finally,they discuss the current technical challenges and future trends of OTFS signal detection for V2X communications. |
| Key words: Vehicle to Everything(V2X) high mobility communication orthogonal time frequency space(OTFS) signal detection |
