  Orthogonal Time Frequency Space (OTFS) systems face significant challenges in
channel estimation due to high pilot overhead and peak-to-average power ratio
(PAPR). To address these issues, we propose a two-step channel estimation
method for Zero-Pad OTFS (ZP-OTFS), a modified OTFS system characterized by
multiple zero rows along the delay axis. This method strategically inserts
pilot sequences into the zero bins of the ZP-OTFS system, effectively
mitigating overhead and PAPR. Comprehensive simulation results validate the
effectiveness of our proposed method, demonstrating its superior performance
over traditional embedded pilot estimation in high Signal-to-Noise Ratio (SNR)
scenarios. Specifically, our method achieves a lower normalized mean square
error (NMSE) and better bit error rates (BER) at high SNRs.
