Localization of mobile sensor nodes is indispensable for underwater sensor networks. For example, in aquatic environment monitoring applications, localization is a must-do task in order to get useful location-aware data. Location information is also required for geo-routing, which is proved to be more scalable and efficient in mobile underwater sensor networks. So far, only a limited number of ...

Underwater acoustic communication is widely used in many areas to collect the data from different kinds of sensors deployed underwater or send control information to remote nodes. However, there are many challenges for underwater communication systems because of the characteristics of acoustic propagation in the underwater environment, such as Doppler spread, ambient noise, fading, high propaga...

In this paper, we analyze the mutual information of sensor networks in an underwater wireless communication system by placing the acoustic sensor nodes at different location in order to achieve optimum mutual information. The performances of acoustic sensors nodes are observed and analyzed by placing the sensors in collaborative and parallel channel network system. Different numerical calculati...

One of the long-term goals of this project is to analyze and propose energy-efficient communication techniques for underwater acoustic sensor networks. These techniques aim at consuming as less energy as possible as well as guaranteeing a minimum quality of service. In order to do so, we assume and validate some statistics of the underwater acoustic channels and derive stochastic optimal transm...

This paper reports the formulation and evaluation of a centralized extended Kalman filter designed for a novel navigation system for underwater vehicles. The navigation system employs Doppler sonar, depth sensors, synchronous clocks, and acoustic modems to achieve simultaneous acoustic communication and navigation. The use of a single moving reference beacon eliminates the requirement for the u...

This paper presents a supervisorymulti-agent control policy over an acoustic communication network subject to imperfections (packet dropout and transmission delay) for localisation of an underwater flow source (e.g., source of chemical pollution, fresh water, etc.) with an unknown location at the bottom of the ocean. A two-loop control policy combined with a coding strategy for reliable communi...

Through adding the trusted protocol, trusted control and management mechanism on existing network architectures, a protocol architecture for trusted underwater acoustic sensor networks is presented, and the constitutes and functions of each part are described. The implementation model of trusted underwater acoustic sensor networks protocol is built, fundamental function that ensure the protocol...

Abstract Recent research has indicated that single carrier frequency domain equalization (SC-FDE) is an attractive technology for underwater acoustic communications. Because it does not have the drawbacks of OFDM systems such as large peak-to-average ratio and the sensitivity to carrier frequency offsets. In this paper, three kinds of frequency domain equalization schemes were compared in the u...

In Underwater Acoustic Sensor Networks (UASNs) maintaining communication integrity is a significant challenge. This is largely due to the adverse physical properties of the medium of communication. The acoustic properties of an underwater environment change significantly with variations in weather. Despite these variations, the typical environment of an UASN remains highly reverberant and prone...

Underwater acoustic network is one of the rapidly growing areas of research and finds different applications for monitoring and collecting various data for environmental studies. The communication among dynamic nodes and high error probability in an acoustic medium forced to maximize energy consumption in Underwater Sensor Networks (USN) than in traditional sensor networks. Developing energy-ef...