Channel and Radar Parameter Estimation With Fractional Delay-Doppler Using OTFS

Orthogonal time frequency space (OTFS) waveform is suited for both communication as well as radar sensing. In this letter, we propose an algorithm for efficient channel estimation at the receiver and range/velocity estimation at the transmitter using OTFS. The algorithm processes received pilot frames for channel estimation at the receiver and data frames echoed from the target/user for range and velocity estimation at the transmitter. A key component in the proposed algorithm is the cancellation of inter-path interference (IPI) in the DD domain. The algorithm works for fractional delay-Doppler which is a source of IPI. The proposed algorithm outperforms other channel estimation schemes and also achieves good root mean square error performance of range and velocity estimation.