underwater communication


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Underwater Communication in Acoustic Particle Velocity Channels via Vector Transducers
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ABSTRACT Acoustic vector transducers can measure or generate signals in underwater acoustic particle velocity channels. They utilize the vector components of the acoustic field, such as the three components of particle velocity. In this paper the principles of data

An Underwater Optical Wireless Communication System Based on LED Source
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 The data rate of the prototype approached to 4 Mb/s at 8.4m and 1 Mb/s at 22m where voice and Morse communications were achieved in a scope of 30 degree TX/RX angle. Keywords: optical wireless communication (OWC), underwater communication, LED

Modulation Analysis for an Underwater Communication Channel
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ABSTRACT As being a project of some complexity, simplified procedures were studied and accomplished as initial phase of the project. The model of the prior channel was restructered, reorganized and added the feature of multiway in virtual environment was in

Analysis of Underwater Environment and Establishment of Underwater Wireless Optical Communication Link
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 achieve high data rate, and also portable communication devices are difficult to be designed at a low cost . Although radio frequencies have enjoyed large success in free space, they experience high attenuation in water and typically not used for underwater communication.

An acoustic communication based AQUA-GLOMO simulator for underwater networks
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 We have upgraded the Glomosim simulator s physical and network layer models to make it feasible for underwater communication.  We will also be focus- ing towards implementing the MAC layer protocol for underwater communication in this simulator.

Simulation of an underwater acoustic communication channel characterized by wind-generated surface waves and bubbles
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 The total simulation framework, called IRSIM, seems to provide realistic results for stationary communication nodes. Index Terms-Acoustic channel simulation, underwater communication, wind-generated waves and bubbles.

Design and Analysis of Passive Phase Based DSSS Communication System in Underwater Acoustic Channels
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TextRoad Publication

Arrival-Based Equalizer for Underwater Communication Systems
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ABSTRACT One of the challenges in the present underwater acoustic communication systems is to combat the underwater channel effects which results in time and frequency spreading of the transmitted signal. The time spreading is caused by the multipath effect while the

Underwater Communication
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There are also rapidly increasing efforts in research on underwater networks with the ambition to support wide area environmental monitoring. Military applications are emerging, especially in the areas of autonomous sensor networks for mine countermeasures (MCM)

Performance Comparison of Overlap FDE Techniques In Underwater Communication
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ABSTRACT The underwater channel being a multipath channel undergoes frequency selective fading. Equalization techniques both in time domain and frequency domain are used to suppress the effects of reverberations at the receiver. However, time domain

A Study on Water-line Performance Improvement based on OFDM System for Underwater Communication
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ABSTRACT To overcome the poor communication environment between the underwater acoustic signal transmitter and receiver, previous research applied underwater acoustic OFDM communication system which had efficient bandwidth capacity and could mitigate

A study of underwater communication based on Walsh spreading code for transmitting pollution measurements of wastewater
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ABSTRACT. In this paper, unerwater acoustic communication technique was studied for reporting pollution degree of wastewater. Underwater communication channel is composed of LOS and NLOS between transmitter and receiver. NLOS path was created by bottom of

Arrival-Based Equalizer for Underwater Communication Systems
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ABSTRACT One of the challenges in the present underwater acoustic communication systems is to combat the underwater channel effects which results in time and frequency spreading of the transmitted signal. The time spreading is caused by the multipath effect while the

MODELING AND SIMULATION OF CHANNEL FOR UNDERWATER COMMUNICATIONNETWORK
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ABSTRACT. According to the characteristics of underwater acoustic channel, Thorp experience formula is adopted in order to simulate seawater absorption properties, on the basis of which, the path loss is solved by means of simulation. A Wenz model is also improved so

A single carrier turbo coded system for underwater communication
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ABSTRACT FOI has during the last several years been engaged in developing a system for underwater acoustic communication for both point to point and network applications. The basis of the system is a Single Carrier (SC) scheme with recursive equalization at the

Energy Efficient Communication for Underwater Wireless Sensors Networks
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 throughput. As in terrestrial sensor networks, various data transport protocols have accepted standard for underwater communication. The

An End-to-End Signal Strength Model for Underwater Optical Communication
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proposed a channel model for optical underwater communication that uses vector radiative transfer theory. Giles et al. gave a model for computing achievable transmission range for a given setup when point- ing both devices at each other.

Blind Cyclostationary Carrier Frequency and Symbol Rate Estimation for Underwater Acoustic Communication
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A. Coarse Estimation via Spectral Analysis In the coarse estimation stage, we first obtain the spectrogram of the signal. Fig. 3 shows the spectrogram of a real underwater communication signal with carrier frequency fc = 17000Hz and symbol rate fb = 4000Hz.

Modeling and Experimental Validation of Basic Characteristics of Underwater Acoustic Communication based on Signals with Sweep-Spread Spectrum
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Sweep-Spread Carrier for Underwater Communication over Acoustic Channels with Strong Multipath Propagation. Journal of Acoustic Society of America, vol.112, issue 5, pp. 2043-2052.

A scalable electro-magnetic communication system for underwater swarms
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 ABSTRACT Scalable, reliable underwater communication is still a major challenge limiting the deploy- ment of large-scale cooperative underwater systems, such as swarms of AUVs, which generally rely on frequent updates from surrounding units for control and mission objectives

Inexpensive Underwater Data Communication
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 remote location.BACKGROUND When looking into what products are available that use acoustic underwater communication, the only common place it s found in

Underwater robot networks: communication and cooperation
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 measured in the field data. Index Terms-Autonomous Underwater Vehicles; AUV; Marine Robotics; Distributed Sensor Networks; Acoustic Communication; Underwater Communication Networks. I. INTRODUCTION HE on-going

Performance Evaluation of DFT-Spread OFDM and DCT-Spread OFDM for Underwater Acoustic Communication
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 Simulation results of both types of systems for underwater acoustic channel are given in section Section VI concludes the paper with a critical comparison of the two approaches to improve OFDM system performance for underwater communication.

request paper Markovian approach to model Underwater Acoustic channel: Techniques comparison



Markovian approach to model underwater acoustic channel: Techniques comparison
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ABSTRACT In the last years, Underwater Acoustic (UWA) sensor networks have exponentially grown in many scientific, industrial and research areas. Wireless underwater communications are required in many application fields, such as real time remote control

Cellular Underwater Wireless Optical CDMA


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Underwater wireless optical communications is an emerging solution to the expanding demand for broadband links in oceans and seas. In this article, a cellular underwater wireless optical code division multiple-access (UW-OCDMA) network based on optical orthogonal codes (OOC) to provide broadband links among many users is described. Fundamental key aspects of the network such as its backhaul architecture and its power control algorithms are presented. In particular, probable design challenges regarding cell edge coverage, blockage avoidance, and increasing number of active mobile users are discussed. Furthermore, potential applications of the proposed network in underwater mobile users communications, local sensor networks, and underwater localization are presented.

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