A dual-input coarse-to-fine residual correction network for underwater acoustic OFDM channel estimation in doubly selective channels
In doubly selective underwater acoustic channels, time-varying multipath and Doppler spread destroy the orthogonality among orthogonal frequency division multiplexing (OFDM) subcarriers. As a result, the least squares (LS) estimates at pilot positions are affected by noise, inter-carrier interference (ICI), and spectra...