Doppler compensation and sparse channel estimation method based on CZT in underwater acoustic OFDMcommunications

Abstract The Doppler-delay double-spreading problem in underwater acoustic channels brought great challenges to applying orthogonal frequency division multiplexing (OFDM) technology. To address the issues of Doppler compensation and channel estimation in OFDM, we proposed a Doppler compensation method based on the Chirp-Z transform (CZT) and an orthogonal matching pursuit (OMP) channel estimation method based on the Chirp-Z transform. Simulation results demonstrate that these methods improve performance and reduce complexity compared to traditional approaches.