Experimental Testing of an OTFS-Modulated Waveform in a Joint Radar-Comm System

This work presents novel results from experimental testing of a recently proposed Orthogonal Time Frequency Space Modulated (OTFSM) waveform in a joint radar-communication system (RadComm). A typical OTFSM signal is used with a standard pilot built from an impulse surrounded by a zero-value rectangular zone in the delay-Doppler domain. The transmitter and receiver use software-defined radio (SDR) technology and have different static locations. The receiver, equipped with reference and surveillance antennas, works as a 4-QAM digital data communication decoder and a passive radar workstation. It is shown in the paper that both goals of the system are reached: 1) after channel estimation and correction, the transmitted data are recovered, and 2) cars moving nearby are properly detected.