Advanced Signal Processing Techniques For Underwater Acoustic Communication Networks
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Advanced Signal Processing Techniques For Underwater Acoustic Communication Networks
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Author : Chunshan Liu
language : en
Publisher:
Release Date : 2011
Advanced Signal Processing Techniques For Underwater Acoustic Communication Networks written by Chunshan Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
In this thesis, we develop and investigate novel signal processing techniques for underwater acoustic communication networks. Underwater acoustic channels differ from radio communication channels in the lower speed of signal propagation, richer and often sparse multipath arrivals, and more severe Doppler effect. Therefore, many signal processing techniques developed for radio communications may not work equivalently well for underwater acoustic channels. To investigate signal processing techniques in underwater acoustics, efficient simulation of signal transmission is required. Specifically, there is requirement for accurate simulation of doubly-selective underwater channels for different acoustic environments. In this thesis, a low-complexity channel simulator has been developed for scenarios with moving transmitter/receiver. The simulator is based on efficient generation of time-varying channel impulse response obtained using interpolation over a set of waymark impulse responses for a relatively small number of sampling points on the transmitter/receiver trajectory. The waymark impulse responses are generated using an acoustic field computation method, which is the most computationally expensive part of the simulator. To reduce the trajectory sampling rate, and thus, to reduce the complexity of the field computation, an approach for adjusting the time-varying multipath delays has been developed. For setting the trajectory sampling interval, a simple rule has been proposed, based on the waveguide invariant theory. To further reduce the simulator complexity, local spline interpolation is exploited. The developed simulator has been verified by comparing the simulated data with data from real ocean experiments. In particular, applying simulated data to an OFDM modem shows similar performance with that obtained from the data of a deep water experiment. In communication networks, knowledge of positions of communication nodes is important for improving the system performance. A multi-source localization technique has been proposed based on the matched field (MF) processing. The technique locates the nodes by solving a set of basis pursuit de-noising (BPDN) problems corresponding to a set of source frequencies. An efficient technique combining the homotopy approach and coordinate descent search has been developed to solve the BPDN problem. Further reduction in the complexity has been achieved by applying a position grid refinement method. Verified using simulated data generated by the proposed simulator and data from real experiment, the proposed technique outperforms other MF techniques in resolving sources positioned closely to each other, tolerance to noise and capability of locating multiple sources. To provide reliable localization based on MF techniques, accurate knowledge of the underwater acoustic environment is essential. However, such knowledge is not always available. Estimating uncertain environmental parameters can be achieved using MF inversion techniques. This requires solving a global optimization problem. Several global optimization algorithms have been investigated and an algorithm combining the simulated annealing and downhill simplex method has been applied for estimating the sound speed profile in a deep water scenario. Accurate MF localization results have been demonstrated when using the estimated sound speed profile. A very important task of communication receivers is accurate channel estimation. The knowledge of node positions and the environment can be exploited for enhancing the channel estimation accuracy and reducing the estimation complexity. This knowledge can be used to define the structure of the channel impulse response, such as the multipath spread and the sparsity. A channel estimator exploiting the channel sparsity estimated from the node positions has been proposed and investigated. The sparse taps of the channel impulse response are identified by solving a BPDN problem. The estimator employs an iterative tap-by-tap processing and uses local splines to interpolate the time-varying tap coefficients. This allows reduction in the complexity and memory requirement, whereas providing a high estimation accuracy.
Advanced Signal Processing Techniques For Underwater Acoustic Communiction Networks
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Author :
language : en
Publisher:
Release Date : 2011
Advanced Signal Processing Techniques For Underwater Acoustic Communiction Networks written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Underwater Acoustic Digital Signal Processing And Communication Systems
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Author : Robert Istepanian
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-09
Underwater Acoustic Digital Signal Processing And Communication Systems written by Robert Istepanian and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-09 with Technology & Engineering categories.
Underwater acoustic digital signal processing and communications is an area of applied research that has witnessed major advances over the past decade. Rapid developments in this area were made possible by the use of powerful digital signal processors (DSPs) whose speed, computational power and portability allowed efficient implementation of complex signal processing algorithms and experimental demonstration of their performance in a variety of underwater environments. The early results served as a motivation for the development of new and improved signal processing methods for underwater applications, which today range from classical of autonomous underwater vehicles and sonar signal processing, to remote control underwater wireless communications. This book presents the diverse areas of underwater acoustic signal processing and communication systems through a collection of contributions from prominent researchers in these areas. Their results, both new and those published over the past few years, have been assembled to provide what we hope is a comprehensive overview of the recent developments in the field. The book is intended for a general audience of researchers, engineers and students working in the areas of underwater acoustic signal processing. It requires the reader to have a basic understanding of the digital signal processing concepts. Each topic is treated from a theoretical perspective, followed by practical implementation details. We hope that the book can serve both as a study text and an academic reference.
Ofdm For Underwater Acoustic Communications
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Author : Sheng Zhou
language : en
Publisher: John Wiley & Sons
Release Date : 2014-03-21
Ofdm For Underwater Acoustic Communications written by Sheng Zhou and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-03-21 with Science categories.
A blend of introductory material and advanced signal processing and communication techniques, of critical importance to underwater system and network development This book, which is the first to describe the processing techniques central to underwater OFDM, is arranged into four distinct sections: First, it describes the characteristics of underwater acoustic channels, and stresses the difference from wireless radio channels. Then it goes over the basics of OFDM and channel coding. The second part starts with an overview of the OFDM receiver, and develops various modules for the receiver design in systems with single or multiple transmitters. This is the main body of the book. Extensive experimental data sets are used to verify the receiver performance. In the third part, the authors discuss applications of the OFDM receiver in i) deep water channels, which may contain very long separated multipath clusters, ii) interference-rich environments, where an unintentional interference such as Sonar will be present, and iii) a network with multiple users where both non-cooperative and cooperative underwater communications are developed. Lastly, it describes the development of a positioning system with OFDM waveforms, and the progress on the OFDM modem development. Closely related industries include the development and manufacturing of autonomous underwater vehicles (AUVs) and scientific sensory equipment. AUVs and sensors in the future could integrate modems, based on the OFDM technology described in this book. Contents includes: Underwater acoustic channel characteristics/OFDM basics/Peak-to-average-ratio control/Detection and Doppler estimation (Doppler scale and CFO)/Channel estimation and noise estimation/A block-by-block progressive receiver and performance results/Extensions to multi-input multi-output OFDM/Receiver designs for multiple users/Cooperative underwater OFDM (Physical layer network coding and dynamic coded cooperation)/Localization with OFDM waveforms/Modem developments A valuable resource for Graduate and postgraduate students on electrical engineering or physics courses; electrical engineers, underwater acousticians, communications engineers
Enabling High Throughput And Secure Underwater Wireless Networks Through Advanced Signal Processing Techniques
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Author : Hovannes Kulhandjian
language : en
Publisher:
Release Date : 2014
Enabling High Throughput And Secure Underwater Wireless Networks Through Advanced Signal Processing Techniques written by Hovannes Kulhandjian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Underwater communication and networks will play a major role in many future commercial, environmental, and military applications, including disaster prevention, tactical surveillance, offshore exploration, pollution monitoring, tsunami detection, sunken airplane or vessel localization and oceanographic data collection. Acoustic wireless communication is the transmission technology of choice for underwater networked systems. However, underwater acoustic signals propagating in water suffer from significant path loss, time-varying multipath propagation, Doppler spread, and high propagation delay. These formidable challenges limit the available bandwidth for underwater acoustic communications, while the rapidly varying channel results in communication links that are highly unreliable, ultimately hindering advancements in underwater networked communications. As a consequence, the field of underwater communication and networking is still in its infancy. The objective of this research work is to further push the boundaries in underwater communication and networking by developing a versatile reconfigurable underwater networking platform, analyzing the statistical channel properties of short-range shallow water communication environments and exploring advanced signal processing techniques to improve the network throughput, provide a secure communication means, and offer a low-cost distributed networked localization and time synchronization framework for underwater acoustic networks. Specifically, in this dissertation, we first present the development of a software-defined underwater networking testbed we developed at the University at Buffalo. In the second part of this work, we investigate underwater acoustic channel characteristics in short-range shallow water environments. In the third part, we propose CDMA-based analog network coding for underwater acoustic sensor networks with the objective to improve the network throughput. In the forth part, we explore CDMA-based analog network coding to provide a secure underwater acoustic communications means. Finally, in the fifth part of this work, we propose a low-cost distributed networked localization and time synchronization framework for underwater acoustic testbeds.
Digital Underwater Acoustic Communications
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Author : Lufen Xu
language : en
Publisher: Academic Press
Release Date : 2016-09-16
Digital Underwater Acoustic Communications written by Lufen Xu and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-09-16 with Technology & Engineering categories.
Digital Underwater Acoustic Communications focuses on describing the differences between underwater acoustic communication channels and radio channels, discusses loss of transmitted sound in underwater acoustic channels, describes digital underwater acoustic communication signal processing, and provides a comprehensive reference to digital underwater acoustic communication equipment. This book is designed to serve as a reference for postgraduate students and practicing engineers involved in the design and analysis of underwater acoustic communications systems as well as for engineers involved in underwater acoustic engineering. Introduces the basics of underwater acoustics, along with the advanced functionalities needed to achieve reliable communications in underwater environment Identifies challenges in underwater acoustic channels relative to radio channels, underwater acoustic propagation, and solutions Shows how multi-path structures can be thought of as time diversity signals Presents a new, robust signal processing system, and an advanced FH-SS system for multimedia underwater acoustic communications with moderate communication ranges (above 20km) and rates (above 600bps) Describes the APNFM system for underwater acoustic communication equipment (including both civil and military applications), to be employed in active sonar to improve its performance
Novel Adaptive Signal Processing Techniques For Underwater Acoustic Communications
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Author :
language : en
Publisher:
Release Date : 2011
Novel Adaptive Signal Processing Techniques For Underwater Acoustic Communications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Advanced Signal Processing Techniques For Underwater Acoustic Transmission Using Steerable Transducer Arrays
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Author : Wichian Ooppakaew
language : en
Publisher:
Release Date : 2012
Advanced Signal Processing Techniques For Underwater Acoustic Transmission Using Steerable Transducer Arrays written by Wichian Ooppakaew and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Hydrophone categories.
Underwater Acoustic Networking Techniques
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Author : Roald Otnes
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-01-19
Underwater Acoustic Networking Techniques written by Roald Otnes and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-01-19 with Science categories.
This literature study presents an overview of underwater acoustic networking. It provides a background and describes the state of the art of all networking facets that are relevant for underwater applications. This report serves both as an introduction to the subject and as a summary of existing protocols, providing support and inspiration for the development of network architectures.
Advancing Underwater Acoustic Communication For Autonomous Distributed Networks Via Sparse Channel Sensing Coding And Navigation Support
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Author :
language : en
Publisher:
Release Date : 2010
Advancing Underwater Acoustic Communication For Autonomous Distributed Networks Via Sparse Channel Sensing Coding And Navigation Support written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
The long-term goal is to significantly advance underwater acoustic communication technologies for autonomous distributed underwater networks, through innovative signal processing, coding, and navigation algorithms. Providing highly reliable and high data rate communication links will be critical towards the development of a new era of underwater distributed networks.