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：正交时频空间（OTFS）是一种调制技术，对双选择性信道的破坏性影响具有鲁棒性。本文通过实时软件无线电（SDR）平台对OTFS进行实验研究。我们的SDR由基于Sionna和TensorFlow编程的图形处理单元（GPU）进行信号处理，以及用于空中接口的通用软件无线电外设（USRP）设备组成。我们实现了低延迟的OTFS收发器结构，并在不同多普勒值下研究其性能。通过与正交频分复用（OFDM）的性能对比，我们证明了OTFS在实时实验平台中对双选择性信道的破坏性影响具有极高的鲁棒性。