论文标题
带有RIS辅助的OTF的输入输出关系和具有分数延迟多普勒的性能
Input-Output Relation and Performance of RIS-Aided OTFS with Fractional Delay-Doppler
论文作者
论文摘要
在最近的无线研究中，可重新配置的智能表面（RIS）和正交时频空间（OTF）的调制引起了人们的关注。 RIS技术通过反映了接收器的电磁波来帮助通信，并且OTFS调制在高多普勒通道中有效。本文介绍了在高多普勒通道中对RIS辅助的OTF进行的早期研究。我们在考虑矩形脉冲和分数延迟多普勒值的情况下，我们得出了RIS辅助OTFS系统的端到端延迟多普勒（DD）域输入输出关系。我们还考虑使用RIS ADED OTF的ZAK接收器，该接收器使用Zak Transform在一个步骤中将接收到的时间域信号转换为DD域，并得出其端到端输入输出关系。我们的仿真结果表明，$ i）$ ris辅助的OTF的性能比没有RIS的OTF，$ II）$ ZAK接收器的性能要比两步接收器更好，而$ iii）$ iii）$ ris aid的OTFS与RIS-aided ofdm相比，$ ris aid otfs的性能卓越。
Reconfigurable intelligent surfaces (RIS) and orthogonal time-frequency space (OTFS) modulation have gained attention in recent wireless research. RIS technology aids communication by reflecting the incident electromagnetic waves towards the receiver, and OTFS modulation is effective in high-Doppler channels. This paper presents an early investigation of RIS-aided OTFS in high-Doppler channels. We derive the end-to-end delay-Doppler (DD) domain input-output relation of a RIS-aided OTFS system, considering rectangular pulses and fractional delay-Doppler values. We also consider a Zak receiver for RIS-aided OTFS that converts the received time-domain signal to DD domain in one step using Zak transform, and derive its end-to-end input-output relation. Our simulation results show that $i)$ RIS-aided OTFS performs better than OTFS without RIS, $ii)$ Zak receiver performs better than a two-step receiver, and $iii)$ RIS-aided OTFS achieves superior performance compared to RIS-aided OFDM.
