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14
Wireless Multimedia Sensor Networks: Current Trends and Future Directions
- SENSORS
, 2010
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Distributed Routing, Relay Selection, and Spectrum Allocation in Cognitive and Cooperative Ad Hoc Networks
"... Abstract—Throughput maximization is a key challenge in cognitive radio ad hoc networks, where the availability of local spectrum resources may change from time to time and hopby-hop. To achieve this objective, cooperative transmission is a promising technique to increase the capacity of relay links ..."
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Cited by 17 (2 self)
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Abstract—Throughput maximization is a key challenge in cognitive radio ad hoc networks, where the availability of local spectrum resources may change from time to time and hopby-hop. To achieve this objective, cooperative transmission is a promising technique to increase the capacity of relay links by exploiting spatial diversity without multiple antennas at each node. This idea is particularly attractive in wireless environments due to the diverse channel quality and the limited energy and bandwidth resources. In this paper, decentralized and localized algorithms for joint dynamic routing, relay assignment, and spectrum allocation in a distributed and dynamic environment are proposed and studied. A cross-layer protocol to implement the joint routing, relay selection, and dynamic spectrum allocation algorithm is also introduced, and its performance is evaluated through simulation. Performance evaluation results show that the proposed protocol achieves much higher throughput than solutions that do not rely on cooperation. Index Terms—Cooperative communications, cognitive radio networks, dynamic spectrum allocation, routing, cross-layer design. I.
A Distortion-minimizing Rate Controller for Wireless Multimedia Sensor Networks
- Computer Communications (Elsevier
, 2010
"... Abstract—The availability of inexpensive CMOS cameras and microphones that can ubiquitously capture multimedia content from the environment is fostering the development of Wireless Multimedia Sensor Networks (WMSNs), i.e., distributed systems of wirelessly networked devices that can retrieve video a ..."
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Cited by 9 (6 self)
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Abstract—The availability of inexpensive CMOS cameras and microphones that can ubiquitously capture multimedia content from the environment is fostering the development of Wireless Multimedia Sensor Networks (WMSNs), i.e., distributed systems of wirelessly networked devices that can retrieve video and audio streams, still images, and scalar sensor data. WMSNs require the sensor network paradigm to be re-thought in view of the need for mechanisms to deliver multimedia content with a pre-defined level of quality of service (QoS). A new rate control scheme for WMSNs is introduced in this paper with a two-fold objective: i) maximize the video quality of each individual video stream; ii) maintain fairness in video quality between different video streams. The rate control scheme is based on both analytical and empirical models and consists of a new cross-layer control algorithm that jointly regulates the end-to-end data rate, the video quality, and the strength of the channel coding at the physical layer. The end-to-end data rate is regulated to avoid congestion while maintaining fairness in the domain of video quality rather than data rate. Once the endto-end data rate has been determined, the sender adjusts the video encoder rate and the channel encoder rate based on the overall rate and the current channel quality, with the objective of minimizing the distortion of the received video. Simulations show that the proposed algorithm considerably improves the received video quality without sacrificing fairness. I.
Cross-Layer QoS-Aware Communication for Ultra Wide Band Wireless Multimedia Sensor Networks
"... are distributed systems of wirelessly networked devices that allow retrieving video and audio streams, still images, and scalar sensor data. WMSNs will be a crucial component of mission-critical networks to protect the operation of strategic national infrastructure, provide support to counteract eme ..."
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Cited by 8 (1 self)
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are distributed systems of wirelessly networked devices that allow retrieving video and audio streams, still images, and scalar sensor data. WMSNs will be a crucial component of mission-critical networks to protect the operation of strategic national infrastructure, provide support to counteract emergencies and threats, and enhance infrastructure for tactical military operations. To enable these applications, WMSNs require the sensor network paradigm to be re-thought in view of the need for mechanisms to deliver multimedia content with a pre-defined level of quality of service (QoS). In this paper, a new cross-layer communication architecture based on the time-hopping impulse radio ultra wide band technology is described, whose objective is to reliably and flexibly deliver QoS to heterogeneous applications in WMSNs, by leveraging and controlling interactions among different layers of the protocol stack according to applications requirements. Simulations show that the proposed system achieves the performance objectives of WMSNs without sacrificing on the modularity of the overall design. Index Terms—Wireless multimedia sensor networks, crosslayer optimization, quality of service, ultra wide band. I.
Correlation-Aware QoS Routing for Wireless Video Sensor Networks
"... Abstract—The spatial correlation among the images retrived from distributed video sensors leads to considerable data redundancy, thus resulting in significant performance degradation in energy efficiency and QoS satisfaction. In this paper, a correlation-aware QoS routing algorithm (CAQR) is propose ..."
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Abstract—The spatial correlation among the images retrived from distributed video sensors leads to considerable data redundancy, thus resulting in significant performance degradation in energy efficiency and QoS satisfaction. In this paper, a correlation-aware QoS routing algorithm (CAQR) is proposed to efficiently deliver visual information under QoS constraints by exploiting the correlation among video sensors. Firstly, a correlation-aware differential coding scheme is designed to reduce the amount of traffic generated by correlated video sensors. Then, a correlation-aware load balancing scheme is proposed to prevent network congestion by spliting the correlated flows that cannot be reduced to different paths. Finally, these correlationaware schemes are integrated into an optimization QoS routing framework with an objective to minimize energy consumption subject to QoS constraints. Simulation results show that the proposed algorithm achieves efficient delivery of visual information under QoS constraints in wireless video sensor networks. I.
Correlation-Aware QoS Routing With Differential Coding for Wireless Video Sensor Networks
"... Abstract—The spatial correlation of visual information retrieved from distributed camera sensors leads to considerable data redundancy in wireless video sensor networks, resulting in significant performance degradation in energy efficiency and quality-of-service (QoS) satisfaction. In this paper, a ..."
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Abstract—The spatial correlation of visual information retrieved from distributed camera sensors leads to considerable data redundancy in wireless video sensor networks, resulting in significant performance degradation in energy efficiency and quality-of-service (QoS) satisfaction. In this paper, a correlation-aware QoS routing algorithm (CAQR) is proposed to efficiently deliver visual information under QoS constraints by exploiting the correlation of visual information observed by different camera sensors. First, a correlation-aware inter-node differential coding scheme is designed to reduce the amount of traffic in the network. Then, a correlation-aware load balancing scheme is proposed to prevent network congestion by splitting the correlated flows that cannot be reduced to different paths. Finally, the correlation-aware schemes are integrated into an optimization QoS routing framework with an objective to minimize energy consumption subject to delay and reliability constraints. Simulation results demonstrate that the proposed routing algorithm achieves efficient delivery of visual information under QoS constraints in wireless video sensor networks. Index Terms—Quality-of-service (QoS), routing, spatial correlation, video compression, wireless video sensor networks. I.
Gautam Buddha
"... Computer network is very essential part of our life by which we can share the information via different technologies such as wired or wireless. Generally the wireless is mostly adopted technology by us due to various advantages like ease of installation, mobility, reconfigure ability, low infrastruc ..."
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Computer network is very essential part of our life by which we can share the information via different technologies such as wired or wireless. Generally the wireless is mostly adopted technology by us due to various advantages like ease of installation, mobility, reconfigure ability, low infrastructural cost etc. but suffers from more attacks as the wireless channel is open. Therefore, many researchers are working in this hot area to secure the wireless communication. Cross layer design refers to protocol design done by actively exploiting the dependence between the protocol layers to obtain better performance gain in the wireless environment. In this paper, we are providing a survey of different security mechanism of cross layer which is the part of wireless network security.
Cross-Layer QoS-Aware Communication for Ultra Wide Band Wireless Multimedia Sensor Networks
"... Abstract-Wireless Multimedia Sensor Networks (WMSNs) are distributed systems of wirelessly networked devices that allow retrieving video and audio streams, still images, and scalar sensor data. WMSNs will be a crucial component of mission-critical networks to protect the operation of strategic nati ..."
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Abstract-Wireless Multimedia Sensor Networks (WMSNs) are distributed systems of wirelessly networked devices that allow retrieving video and audio streams, still images, and scalar sensor data. WMSNs will be a crucial component of mission-critical networks to protect the operation of strategic national infrastructure, provide support to counteract emergencies and threats, and enhance infrastructure for tactical military operations. To enable these applications, WMSNs require the sensor network paradigm to be re-thought in view of the need for mechanisms to deliver multimedia content with a pre-defined level of quality of service (QoS). In this paper, a new cross-layer communication architecture based on the time-hopping impulse radio ultra wide band technology is described, whose objective is to reliably and flexibly deliver QoS to heterogeneous applications in WMSNs, by leveraging and controlling interactions among different layers of the protocol stack according to applications requirements. Simulations show that the proposed system achieves the performance objectives of WMSNs without sacrificing on the modularity of the overall design. Index Terms-Wireless multimedia sensor networks, crosslayer optimization, quality of service, ultra wide band.
AND THEIR APPLICATION TO FALL DETECTION FOR ELDERCARE
"... In the last decade, an alliance between Wireless Sensor Networks and Embedded Smart Cameras (Wireless Embedded Smart Camera Networks) has received a lot of attention from academia and industry, since there exist many unsolved research problems, wireless embedded platforms are small in size and easy ..."
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In the last decade, an alliance between Wireless Sensor Networks and Embedded Smart Cameras (Wireless Embedded Smart Camera Networks) has received a lot of attention from academia and industry, since there exist many unsolved research problems, wireless embedded platforms are small in size and easy to deploy, and they offer a multitude of attractive applications. A Wireless Embedded SmartCamera(WESC)isastandalone unitthatcombinessensing, processing and communication on a single embedded platform. They provide a lot of flexibility in terms of the number and placement of the cameras. They can be used for embedded single unit applications, or can be networked for multi-camera applications. We first analyze three different operation scenarios for a wireless vision sensor network wherein different levels of local processing is performed, and thus different amounts of data is transferred in the network. A detailed quantitative
Cross Layer Optimization for Data Gathering in Wireless Multimedia Sensor Networks within Expected Network Lifetime
"... Abstract: The use of multimedia sensor nodes can significantly enhance the capability of wireless sensor networks (WSNs) for event description. In a number of scenarios, e.g., an erupting volcano, the WSNs are not deployed to work for an extremely long time. Instead, the WSNs aim to deliver continuo ..."
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Abstract: The use of multimedia sensor nodes can significantly enhance the capability of wireless sensor networks (WSNs) for event description. In a number of scenarios, e.g., an erupting volcano, the WSNs are not deployed to work for an extremely long time. Instead, the WSNs aim to deliver continuous and reliable multimedia data as much as possible within an expected lifetime. In this paper, we focus on the efficient gathering of multimedia data in WSNs within an expected lifetime. An adaptive scheme to dynamically adjust the transmission Radius and data generation Rate Adjustment (RRA) is proposed based on a cross layer design by considering the interaction among physical, network and transport layers. We first minimize the end-to-end transmission delay in WSNs while using the minimum data generation rate. In this phase, an optimal transmission radius can be derived. Then, using this transmission radius, we adaptively adjust the data generation rate to increase the amount of gathered data. Simulation results show that the proposed RRA strategy can effectively enhance the data gathering performance in wireless multimedia sensor networks (WMSNs) by dynamically adjusting the transmission radius of sensor nodes and the data generation rate of source nodes.
