The shallow water environment can be considered as a time-dispersive system whose time-varying impulse response can be expressed as a superposition of time-frequency components with dispersive characteristics. In this paper, we propose a frequency-domain characterization of the shallow water system based on the normal-mode model that treats the system as an acoustic medium. After studying the dispersive characteristics of this system, a blind time-frequency processing technique is employed to separate the normal-mode components without knowledge of the relevant environment parameters. This technique is based on first approximating the time-frequency structure of the received signal and then designing time-frequency separation filters based on warping techniques. Following this method, two types of receivers are developed to exploit the diversity of the shallow water channel and to improve underwater communications performance. Simulation results demonstrate the dispersive characterization of this system and the improved processing performance of the receiver schemes.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.