Orthogonal Angle Domain Subspace Projection-Based Receiver Algorithm for Underwater Acoustic Communication

In this letter, the receiver design for shallow water acoustic communication with distinct Doppler is investigated. Conventional Doppler compensation technique may not distinguish different Doppler effects of multipath signals. Accordingly, we propose a receiver algorithm based on hydrophone array angle resolution, which utilizes orthogonal angle domain subspace projection methods to divide the received multipath signals into several subspaces. Moreover, the Dopplers in different subspaces are also estimated and compensated in each orthogonal subspace. Simulation results show that the proposed method can suppress the Doppler effect and achieve better performance in comparison to the conventional single and multiple resampling systems.