OTFS水声通信技术研究现状与展望

Research Status and Prospect of OTFS Underwater Acoustic Communication Technology

摘要:

正交时频空调制是近年来提出的一种用于高速移动无线通信场景的调制技术，通过将时变多径信道转换到时延–多普勒域，使得所有符号都经历几乎相同且变化缓慢的稀疏信道。与正交频分复用系统相比， 正交时频空技术具有较低的峰均功率比，且能够有效抵抗多普勒效应，在高时延、高多普勒的信道条件下具备性能优势。简要介绍了正交时频空技术的基本原理，以及目前无线电及水声通信领域正交时频空技术研究与应用现状，梳理了正交时频空技术在工程应用中亟待解决的关键问题，如波形设计、信道估计和均衡以及接收机结构设计等。最后对正交时频空技术在水声通信系统中面临的挑战和应用前景进行了分析和展望。

Abstract:

Orthogonal time frequency space(OTFS)is a modulation techonoloty proposed for high-speed mobile wireless communication in recent years. It can convert the time-varying multipath channel to the time delay-Doppler (DD)domain，which makes all symbols go through almost the same and slowly changing sparse channel. Compared with the orthogonal frequency division multiplexing(OFDM)system，the OTFS technology has a lower peak to average power ratio，which can effectively resist the Doppler effect and has performance advantages under the channel conditions of high time delay and high Doppler. This paper briefly introduces the basic principle of OTFS technology， as well as the current research and application status in the field of radio and underwater acoustic(UWA) communication. It also sorts out the key problems to be solved in the engineering application of OTFS technology，such as waveform design，channel estimation and equalization，and receiver structure design. Finally，the challenges and application prospects of OTFS technology in UWA communication systems are analyzed and prospected.