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Orthogonal time frequency space (OTFS) is a modulation technique which isrobust against the disruptive effects of doubly-selective channels. In thispaper, we perform an experimental study of OTFS by a real-time software definedradio (SDR) setup. Our SDR consists of a Graphical Processing Unit (GPU) forsignal processing programmed using Sionna and TensorFlow, and UniversalSoftware Radio Peripheral (USRP) devices for air interface. We implement alow-latency transceiver structure for OTFS and investigate its performanceunder various Doppler values. By comparing the performance of OTFS withOrthogonal Frequency Division Multiplexing (OFDM), we demonstrate that OTFS ishighly robust against the disruptive effects of doubly-selective channels in areal-time experimental setup.

A Proof of Concept for OTFS Resilience in Doubly-Selective Channels by GPU-Enabled Real-Time SDR