OTFS Sensing with SDR: Experimental Results and Analysis

Localization will be an essential requirement for various <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$6^{\text{th}}$</tex> generation (6G) communication system applications. Integrated Sensing and Communication (ISAC) is seen as a key enabling technology that can provide the capability of combined communication and localization. Reliable ISAC in a high-mobility environment can be challenging and existing communication waveforms suffer from severe degradation due to significant Doppler effect. The Delay-Doppler (DD) domain can be commonly seen in the results of Radio Detection and Ranging (RADAR) systems, which is the baseline for Orthogonal Time Frequency Space (OTFS) modulation. Due to the information encoding in DD domain, OTFS shows significant resilience against doubly-selective channels. In this work, we report the sensing functionality performance of our complete sub-6GHz ISAC system based on the OTFS waveform, implemented on a USRP X310 Software Defined Radio (SDR). The sensing capability of the system is experimentally verified in both an anechoic chamber and in an office scenario for single and for multitargets.