Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 43 for “"802.15.4"”.
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Estudi de xarxes WPAN 802.15.4
… de les característiques de les xarxes WPAN 802.15.4 i de les xarxes ZigBee.
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IEEE 802.15.4 Implementation on an Embedded Device
… of SDR, this thesis shows how to implement IEEE 802.14.5, a low-rate wireless personal area network (LR-WPAN) standard, on a standalone embedded machine. The implementation is done using a universal software radio peripheral embedded, USRP E100, an open source software development toolkit for …
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RF techniques for IEEE 802.15.4: circuit design and device modelling
… power applications. After identifying the IEEE 802.15.4 standard (commercially known as ZigBee) as the one of choice, and analysing several front-end architectures on which its transceiver circuitry can be based, an application, the Tyre Pressure Monitoring System (TPMS) is selected to examine …
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Hybrid FPGA and GPP Implementation of IEEE 802.15.4 Physical Layer
… this thesis, two different cases of hybrid IEEE 802.15.4 PHY (Physical Layer) implementation are explored. The first case is an FPGA implementation of IEEE 802.15.4 PHY on the Xilinx Spartan-3A DSP FPGA of USRP N210. All of the signal processing tasks are performed on the FPGA, while less complex …
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Ieee 802.15.4 Wireless Sensor Networks: Gts Scheduling and Service Differentiation
… IEEE has created a new standard called IEEE 802.15.4 for LR-WPAN, which has been widely accepted as the de facto standard for wireless sensor networks. Unlike IEEE 802.11 [2], which was designed for Wireless Local Area Networks (WLAN), it focuses on short range wireless communications. The …
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Distributed Contention-Free Access for Multi-hop IEEE 802.15.4 Wireless Sensor Networks
The IEEE 802.15.4 standard is a low-power, low-rate MAC/PHY standard that meets most of the stringent requirements of single-hop wireless sensor networks. Sensor networks with nodal populations comprised of thousands of devices have been envisioned in conjunction with environmental, vehicular, and …
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Algorithms for indoor localization based on IEEE 802.15.4-2011 UWB and inertial sensors
… the performance of using the emerging IEEE 802.15.4-2011 ultra wideband (UWB) for indoor localization, and the results demonstrate the accuracy and precision of using time of arrival measurements for ranging applications. A multipath propagation controlling technique is synthesized which …
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The Design, Building, and Testing of a Constant on Discreet Jammer for the IEEE 802.15.4/ZIGBEE Wireless Communication Protocol
… loss, security issues, and bodily harm. The 802.15.4/ZigBee protocol is used in low power, low data rate, and low cost wireless applications such as medical devices and home automation devices. This protocol uses CSMA-CA (Carrier Sense Multiple Access w/ Collision Avoidance) which allows for …
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Particle swarm optimization applications to mpeg-4 transmission over ZigBee
The IEEE 802.15.4 standard commonly known as ZigBee is a wireless sensor targeted at applications that require low data rate, low power and less expense. IEEE 802.15.4 standard is limited to a through-rate of 250kbps maximum providing supports for small packet file transitions and is design to …
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A performance analysis of ad-hoc ocean sensor network
… results and performance analysis of IEEE 802.15.4 in an oceanic environment. The 802.15.4 standard allows simple sensors and actuators to co-exist in a single wireless platform. The simulation is performed using Network Simulator, version 2 (NS2) which is an open-source network simulator …
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Receiver-Assigned CDMA in Wireless Sensor Networks
… feature hundreds of low power, low data rate (1-15 kbps) wireless sensor nodes within a limited spatial environment. Existing Medium Access Control (MAC) layer protocols, namely IEEE 802.15.4, may not be suitable for highly dense, low rate networks. A new MAC protocol has been proposed that …
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On a Joint Physical Layer and Medium Access Control Sublayer Design for Efficient Wireless Sensor Networks and Applications
… been stimulated by the finalisation of the IEEE 802.15.4 standard, which defines the medium access control (MAC) and physical layer (PHY) for low-rate wireless personal area networks (LR-WPAN). Future applications may require large WSNs consisting of huge numbers of inexpensive wireless sensor …
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Wireless sensor network for health monitoring
… reduce the cost of power and maintenance, IEEE 802.15.4/ZigBee, a communication standard for low-power wireless communication, is developed as a new efficient technology in health monitoring systems. The main contribution of this dissertation is to provide a modeling, analysis, and design …
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Modelling, analysis and design of MAC and routing protocols for wireless body area sensor networks.
… with Collision Avoidance (CSMA/CA) for the IEEE 802.15.4 and IEEE 802.15.6 standards. By using this modelling, we proposed a MAC layer mechanism called Delay, Reliability and Throughput (DRT) profile for the IEEE 802.15.4 and IEEE 802.15.6, which jointly optimize the QoS in terms of limited …
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A self-configuring wireless sensor network
… implemented network technology and the Zigbee 802.15.4 network being selected for future implementations and developments.The Bluetoo Protocol is described. An investigation into several different open source protocol stacks was made with the BlueZ protocol stack being selected as the …
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Wireless Sensor Networking in Challenging Environments
… environments. Our empirical study in over 15 real-world apartments shows that low-power WSNs based on the IEEE 802.15.4 standard are highly susceptible to external interference beyond user control, such as Wi-Fi access points, Bluetooth peripherals, cordless phones, and numerous other …
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MAC AND APPLICATION LAYER PROTOCOLS FOR HIGH PERFORMANCE NETWORKING
… standards in this area are governed by IEEE 802.15.4 specification which defines protocols for MAC and PHY layers for short-range, low bit-rate, and low-cost wireless networks. However, the IEEE 802.15.4 specification is inefficient in terms of latency and reliability performance and, as a …
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Quality-aware voice convergecast in mobile low power wireless networks
… using Arduino Due micro-controllers with XBee 802.15.4 radios. We create mobile scenarios by placing the Arduino Dues on iRobot Create mobile robots. Our results show that our system can adequately adapt to changing network and routing conditions to deliver sufficient voice quality by …
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Micro-Moving Target IPv6 Defense for 6LoWPAN and the Internet of Things
… Area Networks (6LoWPAN) which is used in IEEE 802.15.4 wireless networks in order to establish IPv6 communications. The purpose of this defense is to obfuscate the communications between a sensor and a server in order to thwart a potential attacker from performing eavesdropping, …
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