Underwater Acoustic FBMC System Based on Dual Prototype Filters and Pruned-DFT

The complex and changeable characteristics of the underwater acoustic channels reduce the performance of the underwater acoustic (UWA) communication. High peak-to-average power ratio (PAPR) and bit error rate (BER) performance are main problems in UWA communications. To address above issues, the pruned discrete Fourier transform (Pruned-DFT) of filter bank multicarrier (FBMC) scheme in UWA is introduced, which can decrease the PAPR. We also propose dual filters based on sequence (DFBS), and random binary sequence allows the prototype filter to be used flexibly without increasing the complexity of the system. At the same time, in order to reduce the intrinsic interference, auxiliary orthogonalization matrix is employed to improve BER performance of the system. Numerical results demonstrate that the proposed scheme can effectively reduce BER and PAPR of the system.