Performance Analysis of Joint Radar and Communication using OFDM and\n OTFS

Abstract

We consider a joint radar estimation and communication system using\northogonal frequency division multiplexing (OFDM) and orthogonal time frequency\nspace (OTFS) modulations. The scenario is motivated by vehicular applications\nwhere a vehicle equipped with a mono-static radar wishes to communicate data to\nits target receiver, while estimating parameters of interest related to this\nreceiver. By focusing on the case of a single target, we derive the maximum\nlikelihood (ML) estimator and the Cram\\'er-Rao lower bound on joint velocity\nand range estimation. Numerical examples demonstrate that both digital\nmodulation formats can achieve as accurate range/velocity estimation as\nstate-of-the-art radar waveforms such as frequency modulated continuous wave\n(FMCW) while sending digital information at their full achievable rate. We\nconclude that it is possible to obtain significant data transmission rate\nwithout compromising the radar estimation capabilities of the system.\n