Non-Uniform Doppler Compensation Method for Staggered Multitone Filter Bank Multicarrier in the Underwater Acoustic Channel

This paper focuses on the results of our research on Doppler estimation and compensation for Staggered Multi-Tone filter bank multicarrier (SMT-FBMC) communication system in the underwater acoustic channel. We propose a Doppler compensation algorithm for the large-scale Doppler in underwater acoustic (UWA) channel. First, we resample the SMT-FBMC signal at the receiving end using the coarse estimation factor calculated by the synchronous signal. Then we analyze the residual Doppler effect resulting from resampling. We study the composition of the baseband signal through the analysis filter bank (AFB) and find that the residual Doppler has the same impact as the carrier frequency offset (CFO). Finally, we estimate the residual Doppler factor by measuring the phase shift of the pilot signal and achieve the residual Doppler compensation in the time domain. The simulation results show that the proposed algorithm can eliminate the error floor caused by resampling, and improve the performance of the bit error rate (BER) of nearly 5dB in both Doppler compression and extension cases.