PIM-OTFS Based DFRC System in Limited Feedback and High Mobility Scenarios

This paper proposes index modulation (IM) based on pilot location for an Orthogonal time frequency space (OTFS)based dual function radar communication (DFRC) system to circumvent the complexity involved in conventional IM schemes. A joint channel and indexing of the pilot estimation algorithm is proposed at the communication receiver. A joint target range and precise channel prediction algorithm is proposed at the joint transmitter and radar (JTR). The precise channel information predicted by the JTR is utilized to perform zero-forcing beamforming for providing physical layer security to the proposed autonomous vehicle network (AVN) over limited feedback and high mobility scenario. A closed-form expression of ergodic secrecy capacity over an outdated and generalized Norton channel is derived to provide the analytical guarantees of the proposed algorithms. Simulations of different performance metrics for the proposed schemes are provided and corroborated with existing works.