面向太赫兹通信的改进OTFS波形调制与设计

Improved OTFS Waveform Modulation and Design for Terahertz Communication

太赫兹(Terahertz,THz)通信在6G网络中展现了潜在的重要性,具有高传输速率、强抗干扰能力和易于信号检测等优点。回顾了已有的THz信道建模工作,分析了关键参数如分子吸收效应和传播距离的早期模型,以及基于纳米网络小粒子散射效应的时域和频域信道模型。强调了THz通信技术面临的挑战,如功率放大器效率和多普勒扩展效应,这些限制了THz的传输距离和性能。鉴于这些挑战,提出了对波形设计的新要求,对增强正交时频空(Orthogonal Time Frequency Space,OTFS)波形进行了设计和研究,以减少高速移动带来的多普勒效应,搭建物理层仿真链路模型测量改进OTFS的性能。通过仿真和性能比较,展示了所提增强OTFS波形相对于传统波形的优越性。

Terahertz(THz)communication has demonstrated significant potential in the context of 6G networks,characterized by high transmission rates,robust interference resistance,and facile signal detection.This paper reviews existing works on THz channel modeling,encompassing analyses of key parameters such as molecular absorption effects and propagation distance in early models,as well as time-domain and frequency-domain channel models based on nanonetworks and small particle scattering effects.The authors underscore challenges faced by THz communication technology,such as power amplifier efficiency and Doppler broadening effects,which limit the transmission distance and performance of THz communication.In light of these challenges,the paper proposes novel requirement for waveform design.Primary contributions of this study involve the design and investigation of enhanced Orthogonal Time Frequency Space(OTFS)waveforms to mitigate Doppler effects induced by high-speed mobility.A physical layer simulation link model is constructed to measure the improved performance of OTFS.Finally,through simulations and performance comparisons,the authors demonstrate the superiority of the proposed enhanced OTFS waveforms over traditional waveforms.