A Bandwidth Efficient Dual Function Radar Communication System Based on a MIMO Radar Using OTFS Waveforms

A novel dual-function radar communication (DFRC) system is proposed that can accommodate high mobility scenarios while making efficient use of bandwidth for both communication and sensing. The system comprises a monostatic multiple-input multiple-output (MIMO) radar that transmits orthogonal time frequency space (OTFS) waveforms. Bandwidth efficiency is achieved by making all Doppler-delay (DD) domain bins available for all transmit antennas. While this shared use of DD bins allows for high communication rate, it makes target estimation challenging. A low complexity method is proposed to estimate the radar parameters at the receiver. The proposed system not only exhibits the advantages of other multi-carrier waveforms, but is also more robust to Doppler frequency shifts that arise in high mobility scenarios. Simulation results demonstrate the promise of the proposed approach in 6G system.