Orthogonal time frequency space (OTFS) is a modulation technique which is robust against the disruptive effects of doubly-selective channels. In this paper, we perform an experimental study of OTFS by a real-time software defined radio (SDR) setup. Our SDR consists of a Graphical Processing Unit (GPU) for signal processing programmed using Sionna and TensorFlow, and Universal Software Radio Peripheral (USRP) devices for air interface. We implement a low-latency transceiver structure for OTFS and investigate its performance under various Doppler values. By comparing the performance of OTFS with Orthogonal Frequency Division Multiplexing (OFDM), we demonstrate that OTFS is highly robust against the disruptive effects of doubly-selective channels in a real-time experimental setup.

翻译：正交时频空（OTFS）是一种对双选择性信道干扰效应具有鲁棒性的调制技术。本文通过实时软件无线电（SDR）实验平台对OTFS进行实验研究。该SDR系统采用图形处理器（GPU）进行信号处理，编程环境基于Sionna与TensorFlow，并通过通用软件无线电外设（USRP）设备实现空中接口。我们实现了低延迟OTFS收发结构，并对其在不同多普勒值下的性能进行探究。通过将OTFS与正交频分复用（OFDM）进行性能对比，实验结果表明OTFS在实时实验场景中对双选择性信道的干扰效应具有高度鲁棒性。