Download or read book Energy Efficient Reconfigurable MAC Protocol for Underwater Acoustic Sensor Network written by Khaja Mohammad Shazzad and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Efficient MAC Protocol for Underwater Acoustic Sensor Networks written by Lei Wang and published by . This book was released on 2011 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Underwater Acoustic Sensor Networks written by Yang Xiao and published by CRC Press. This book was released on 2010-05-19 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed review of underwater channel characteristics, Underwater Acoustic Sensor Networks investigates the fundamental aspects of underwater communication. Prominent researchers from around the world consider contemporary challenges in the development of underwater acoustic sensor networks (UW-ASNs) and introduce a cross-layer approach for effec

Download or read book Energy Efficient Underwater Wireless Communications and Networking written by Goyal, Nitin and published by IGI Global. This book was released on 2020-09-04 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: Underwater wireless sensor networks (UWSN) are envisioned as an aquatic medium for a variety of applications including oceanographic data collection, disaster management or prevention, assisted navigation, attack protection, and pollution monitoring. Similar to terrestrial wireless sensor networks (WSN), UWSNs consist of sensor nodes that collect the information and pass it to a base station; however, researchers have to face many challenges in executing the network in an aquatic medium. Energy-Efficient Underwater Wireless Communications and Networking is a crucial reference source that covers existing and future possibilities of the area as well as the current challenges presented in the implementation of underwater sensor networks. While highlighting topics such as digital signal processing, underwater localization, and acoustic channel modeling, this publication is ideally designed for machine learning experts, IT specialists, government agencies, oceanic engineers, communication experts, researchers, academicians, students, and environmental agencies concerned with optimized data flow in communication network, securing assets, and mitigating security attacks.

Download or read book Energy Efficient Underwater Acoustic Sensor Networks written by Chaima Zidi and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: UnderWaterAcoustic Sensor Networks (UW-ASNs) are the newest technological achievement in terms of communication. Composed of a set of communicating underwater sensors, UW-ASNs are intended to observe and explore lakes, rivers, seas and oceans. Recently, they have been subject to a special attention due to their great potential in terms of promising applications in various domains (military, environmental, scientific...) and to the new scientific issues they raise. A great challenging issue in UW-ASNs is the fast energy depletion since high power is needed for acoustic communication while sensors battery budget is limited. Hence, energy-efficient networking protocols are of a paramount importance to make judicious use of the available energy budget while considering the distinguishing underwater environment characteristics. In this context, this thesis aims at studying the main challenging underwater acoustic sensors characteristics to design energy-efficient communication protocols specifically at the routing and MAC layers. First, we address the problem of energy holes in UW-ASNs. The sink-hole problem occurs when the closest nodes to sink drain their energy faster due to their heavier load. Indeed, those sensors especially the ones that are 1-hop away from the static sink act as relays to it on behalf of all other sensors, thus suffering from severe energy depletion. In particular, at the routing layer, we propose to distribute the transmission load at each sensor among several potential neighbors, assuming that sensors can adjust their communication range among two levels when they send or forward data. Specifically, we determine for each sensor the set of next hops with the associated load weights that lead to a fair energy depletion among all sensors in the network. Then, we extend our balanced routing strategy by assuming that each sensor node is not only able to adjust its transmission power to 2 levels but eventually up to n levels where n > 2. Consequently, at the routing layer, for each possible value of n, we determine for each sensor the set of possible next hops with the associated load weights that lead to a fair energy consumption among all sensors in the network. Moreover, we derive the optimal number of transmission powers n that balances the energy consumption among all sensors for each network configuration. In addition to that, it is worth pointing out that our extended routing protocol uses a more realistic time varying channel model that takes into account most of the fundamental characteristics of the underwater acoustic propagation. Analytical results show that further energy saving is achieved by our extended routing scheme. Second, to mitigate the dramatic collision impacts, we design a collision avoidance energy efficient multichannel MAC protocol (MC-UWMAC) for UW-ASNs. MC-UWMAC operates on single slotted control and a set of equal-bandwidth data channels. Control channel slots are dedicated to RTS/CTS handshaking allowing a communicating node pair to agree on the start time of communication on a pre-allocated data channel. In this thesis, we propose two novel coupled slot assignment and data channels allocation procedures without requiring any extra negotiation overhead. Accordingly, each node can initiate RTS/CTS exchange only at its assigned slot calculated using a slot allocation procedure based on a grid virtual partition of the deployment area. Moreover, for each communicating pair of nodes, one data channel is allocated using a channel allocation procedure based on our newly designed concept of singleton- intersecting quorum. Accordingly, each pair of communicating nodes will have at their disposal a unique 2-hop conflict free data channel. Compared with existing MAC protocol, MC-UWMAC reduces experienced collisions and improves network throughput while minimizing energy consumption.

Download or read book Cross layer Protocols for Underwater Acoustic Sensor Networks with MIMO Links written by Li-Chung Kuo and published by . This book was released on 2013 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: UnderWater Acoustic Sensor Networks (UW-ASNs) are experiencing a rapid growth, due to their high relevance to commercial and military applications such as oceanographic data collection, pollution monitoring, offshore exploration, disaster prevention, and tactical surveillance. However, the design of efficient communication protocols for underwater sensor networks is still an open research problem due to the unique characteristics of the underwater acoustic communication channel such as limited bandwidth, high and variable propagation delays, and significant multipath and scattering. MIMO systems are able to exploit rich scattering and multipath fading to provide higher spectral efficiencies without increasing power and bandwidth. The objective of this research is to explore the capabilities of underwater MIMO links, and to leverage these from the perspective of higher layer protocols with a cross-layer design approach. First, a new medium access control protocol named UMIMO-MAC is proposed. UMIMO-MAC is designed to i) adaptively leverage the tradeoff between multiplexing and diversity gain according to channel conditions and application requirements, ii) select suitable transmit power to reduce energy consumption, and iii) efficiently exploit the UW channel, minimizing the impact of the long propagation delay on the channel utilization efficiency. To achieve the objectives above, UMIMO-MAC is based on a two-way handshake protocol. Multiple access by simultaneous and co-located transmissions is achieved by using different pseudo-orthogonal spreading codes. An algorithm is proposed that, in a cross-layer fashion, jointly selects optimal transmit power and transmission mode through the cooperation of transmitter and receiver to achieve the desired level of reliability and data rate according to application needs and channel condition. Second, distributed routing algorithms are introduced for delay-insensitive and delay-sensitive applications, with the objective of reducing the energy consumption by i) leveraging the tradeoff between multiplexing and diversity gain that characterizes MIMO links, and ii) allocating transmit power on suitable subcarriers according to channel conditions and application requirements. To achieve the objective above, each node jointly i) selects its next hop, ii) chooses a suitable transmission mode, and iii) assigns optimal transmit power on different subcarriers to achieve a target level of Quality of Service (QoS) in a cross-layer fashion. Extensive simulation results demonstrate that our proposed protocol is adaptive to the unique characteristics of the underwater acoustic communication channel, and achieves excellent performance through local cooperations between transmitter and receiver. Finally, we present our ongoing work on developing a reconfigurable underwater networking testbed based on the Teledyne Benthos Telesonar SM-75 modem. The testbed is designed with the objective of allowing researchers and developers to advance research activities in the field of underwater networking and communications through a flexible testbed platform. This platform allows playing, processing, and recording custom-defined acoustic waveforms to support reconfigurable physical layer experimentation with arbitrary transmission schemes.

Download or read book Energy efficient Distributed MAC Protocols for Underwater Sensor Networks written by Faisal Alfouzan and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Underwater Acoustic Sensor Networks written by Peng Xie and published by . This book was released on 2007 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A MAC Protocol for Ad hoc Underwater Acoustic Sensor Networks written by Borja Peleato and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A medium access control (MAC) protocol is proposed that is suitable for non-synchronized ad-hoc networks, and in particular for the energy-constrained underwater acoustic networks which are characterized by long propagation delays. The protocol exploits the difference in the link lengths between the nodes instead of waiting times proportional to the maximal link length. To do so, it relies on a receiver's ability to tolerate a certain level of interference. By minimizing the length of the hand-shake procedure preceeding the data transmission, the throughput efficiency is increased as compared to the previously proposed protocols, while collision avoidance minimizes the energy consumption.

Download or read book Optical Acoustic Magnetic and Mechanical Sensor Technologies written by Krzysztof Iniewski and published by CRC Press. This book was released on 2017-12-19 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: Light on physics and math, with a heavy focus on practical applications, Optical, Acoustic, Magnetic, and Mechanical Sensor Technologies discusses the developments necessary to realize the growth of truly integrated sensors for use in physical, biological, optical, and chemical sensing, as well as future micro- and nanotechnologies. Used to pick up sound, movement, and optical or magnetic signals, portable and lightweight sensors are perpetually in demand in consumer electronics, biomedical engineering, military applications, and a wide range of other sectors. However, despite extensive existing developments in computing and communications for integrated microsystems, we are only just now seeing real transformational changes in sensors, which are critical to conducting so many advanced, integrated tasks. This book is designed in two sections—Optical and Acoustic Sensors and Magnetic and Mechanical Sensors—that address the latest developments in sensors. The first part covers: Optical and acoustic sensors, particularly those based on polymer optical fibers Potential of integrated optical biosensors and silicon photonics Luminescent thermometry and solar cell analyses Description of research from United States Army Research Laboratory on sensing applications using photoacoustic spectroscopy Advances in the design of underwater acoustic modems The second discusses: Magnetic and mechanical sensors, starting with coverage of magnetic field scanning Some contributors’ personal accomplishments in combining MEMS and CMOS technologies for artificial microsystems used to sense airflow, temperature, and humidity MEMS-based micro hot-plate devices Vibration energy harvesting with piezoelectric MEMS Self-powered wireless sensing As sensors inevitably become omnipresent elements in most aspects of everyday life, this book assesses their massive potential in the development of interfacing applications for various areas of product design and sciences—including electronics, photonics, mechanics, chemistry, and biology, to name just a few.

Download or read book Smart Sensors for Industrial Applications written by Krzysztof Iniewski and published by CRC Press. This book was released on 2017-12-19 with total page 601 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sensor technologies are a rapidly growing area of interest in science and product design, embracing developments in electronics, photonics, mechanics, chemistry, and biology. Their presence is widespread in everyday life, where they are used to sense sound, movement, and optical or magnetic signals. The demand for portable and lightweight sensors is relentless in several industries, from consumer electronics to biomedical engineering to the military. Smart Sensors for Industrial Applications brings together the latest research in smart sensors technology and exposes the reader to myriad applications that this technology has enabled. Organized into five parts, the book explores: Photonics and optoelectronics sensors, including developments in optical fibers, Brillouin detection, and Doppler effect analysis. Chapters also look at key applications such as oxygen detection, directional discrimination, and optical sensing. Infrared and thermal sensors, such as Bragg gratings, thin films, and microbolometers. Contributors also cover temperature measurements in industrial conditions, including sensing inside explosions. Magnetic and inductive sensors, including magnetometers, inductive coupling, and ferro-fluidics. The book also discusses magnetic field and inductive current measurements in various industrial conditions, such as on airplanes. Sound and ultrasound sensors, including underwater acoustic modem, vibrational spectroscopy, and photoacoustics. Piezoresistive, wireless, and electrical sensors, with applications in health monitoring, agrofood, and other industries. Featuring contributions by experts from around the world, this book offers a comprehensive review of the groundbreaking technologies and the latest applications and trends in the field of smart sensors.

Download or read book A Simulation Study of Energy Efficient Mac Protocol written by Dinesh Moparthi and published by LAP Lambert Academic Publishing. This book was released on 2012-06 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless Sensor node is a tiny device which are capable of sensing, transmitting and computing data. Generally the nodes are powered by battery for energy, so energy is most important resource in sensor networks. Mostly the power consumption in the node is due to transceiver or radio in the node. By energy efficient design of the MAC layer protocol we can reduce the power consumed by radio. In this report S-MAC an energy efficient MAC protocol is studied and explained how energy can be reduced by using this MAC protocol. S-MAC is designed especially for Wireless Sensor Networks, simulation results are shown compared with normal wireless MAC.

Download or read book Efficient Communication Protocols for Underwater Acoustic Sensor Networks written by Dario Pompili and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Underwater sensor networks find applications in oceanographic data collection, pollution monitoring, offshore exploration, disaster prevention, assisted navigation, tactical surveillance, and mine reconnaissance. The enabling technology for these applications is acoustic wireless networking. UnderWater Acoustic Sensor Networks (UW-ASNs) consist of sensors and Autonomous Underwater Vehicles (AUVs) deployed to perform collaborative monitoring tasks. The objective of this research is to explore fundamental key aspects of underwater acoustic communications, propose communication architectures for UW-ASNs, and develop efficient sensor communication protocols tailored for the underwater environment. Specifically, different deployment strategies for UW-ASNs are studied, and statistical deployment analysis for different architectures is provided. Moreover, a model characterizing the underwater acoustic channel utilization efficiency is introduced. The model allows setting the optimal packet size for underwater communications. Two distributed routing algorithms are proposed for delay-insensitive and delay-sensitive applications. The proposed routing solutions allow each node to select its next hop, with the objective of minimizing the energy consumption taking the different application requirements into account. In addition, a resilient routing solution to guarantee survivability of the network to node and link failures in long-term monitoring missions is developed. Moreover, a distributed Medium Access Control (MAC) protocol for UW-ASNs is proposed. It is a transmitter-based code division multiple access scheme that incorporates a novel closed-loop distributed algorithm to set the optimal transmit power and code length. It aims at achieving high network throughput, low channel access delay, and low energy consumption. Finally, an efficient cross-layer communication solution tailored for multimedia traffic (i.e., video and audio streams, still images, and scalar sensor data) is introduced.

Download or read book Study of an Energy efficient and Low latency MAC Protocol for Mobile Wireless Sensor Networks written by Prasad Raviraj and published by . This book was released on 2005 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Validation of an Energy Efficient MAC Protocol for Wireless Sensor Network International Journal of Computing and Digital Systems 2013 Vol 2 No 3 written by Sricharan Madduri and published by . This book was released on 2013 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reliable Communication in Underwater Acoustic Sensor Networks written by Zheng Guo and published by . This book was released on 2011 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ex Mac written by Dr. M. Nanda Kumar and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Energy efficient protocol design is the aim of current researches in the area of sensor networks where limited power resources impose energy conservation considerations. In this paper we concern for Medium Access Control (MAC) protocols the recent technology that is used in the Wireless sensor networks are appealing to researchers to achieve an efficient medium access protocol subject to power constraints. We outline the design of MAC layer protocols that employ adaptive duty cycle as means of further optimizing the energy conservation. In most case each nodes determines the duty cycle as a function of its own traffic load. The IEEE 802.15.4 is a new wireless personal area network designed for wireless monitoring and control applications. Of course the IEEE 802.15.4 MAC protocol performs poorly for one-hop data collection in sense sensor network. Here we developed a new MAC protocol, EX-MAC that amalgamate the E-MAC and the X-MAC. EX-MAC protocol design methodology and results projected at self-learning, traffic adaptive algorithm for varying traffic conditions inherent to the WSNs. The design incorporates reliable and scalable energy-aware sensing network, in spite of node failures, minimizing energy consumption at the same time. Our present and future work is based on adaptive EX-MAC protocol that is designed for wireless sensor networks. Here we first highlighted the main draw back of the E-MAC and X-MAC and then a proposed solution that enables low duty cycle operation, dynamic sleep schedules to reduce the control overhead, traffic adaptive wakeup and low latency. To overcome this control overhead and latency, we suggested the contention based on CSMA/CA mechanism. This protocol is simulated in NS-2 and performs evaluated.