Stage-wise orthogonal matching pursuit for estimation of time delay and Doppler doubly spreading of underwater acoustic channels

The model of time delay and Doppler (DD) doubly spread is usually used for estimation of underwater acoustic channel (UAC) of time-varying and multi path. This study introduces the doubly spread model, then forms the optimization problem of channel estimations. By exploiting the sparsity of UAC, we propose the stage-wise orthogonal matching pursuit by inserting the orthogonal projection strategy on two domains. The traditional methods including least square (LS) based method, matching pursuit (MP), and orthogonal matching pursuit (OMP) methods are used for comparisons based on doubly spread models. Finally, the superiority of the proposed method is verified by experimental results.