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Over the past two decades, there has been a growth in human activities in coastal waters worldwide, including underwater blasting. The broadband, high source-level noise produced by underwater blasting can seriously affect marine mammals and fish, leading to behavior modification, hearing organ damage and even death. Large yellow croaker (Pseudosciaena crocea), which is an important fish species in...
Dolphins have a very powerful sonar system for finding food, communicating with each other and escaping from predators. Recently there has been an increasing research interest on dolphin sonar signals. For most wild dolphins, e.g., Chinese white dolphins (Sousa chinensis), the recorded sound signal is a combination of the dolphin's bioacoustic signal and the effect of a multipath shallow-water acoustic...
Wind raises time-varying roughness on air-sea interface, which deflects underlying sound and modifies underwater acoustic channel in short timescale. Performance degradations and system failures in underwater acoustic communication were reported due to wind-induced surface waves, especially for coherent communication systems which utilize phase information during the modulation. Here, we propose a...
In order to monitor bred fish in an offshore aquaculture cage farm and the aquatic environment surrounding the farm daily, a centralized remote monitoring system was developed. The system is composed of a group of Remote Detecting Nodes (RDNs) and a Local Monitor and Control Center (LMCC). RDNs based on the techniques of circular multi-beam detection and multi-path signal process were placed in the...
In fast temporal variations shallow water acoustic (SWA) channels, flexible channel coding rate should be desired in the design of practical error control SWA communication system. Herein, as one of the dynamic coding schemes, rate compatible LDPC (RC-LDPC) codes combing OFDM technique are proposed to improve the system reliability for SWA communications. Based on the automatic repeat request (ARQ)...
Underwater acoustic communications are required for controlling and networking a variety of underwater or sea surface objects. Due to the unique characteristics of the underwater acoustic channel, e.g., complicated multipath propagation, selective frequency fading, extreme Doppler effect and heavy ambient noise, FH-MFSK techniques play a vital role in robust underwater acoustic communication, especially...
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