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 23 for “"Duty Cycling"”.
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High-Performance Communication Protocols for Asynchronous Duty-Cycling Wireless Networks
Duty cycling is a technique for saving energy in resource-limited wireless networks such as sensor networks. With duty cycling, each node periodically switches between active and sleeping states, for example being active for only 1 to 10 percent of the time. Wireless duty-cycling networks face many …
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Predictive Duty Cycling of Radios and Cameras using Augmented Sensing in Wireless Camera Networks
… design of wireless camera networks (WCNs), and duty cycling of radios and cameras is an important tool for achieving high energy efficiencies. However, duty cycling in WCNs is made complex by the camera nodes having to anticipate the arrival of the objects in their field-of-view. What adds to …
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Duty-Cycled Wireless Sensor Networks: Wakeup Scheduling, Routing, and Broadcasting
… to save energy consumption in idle states, low duty-cycled operation is widely used in Wireless Sensor Networks (WSNs), where each node periodically switches between sleeping mode and awake mode. Although efficient toward saving energy, duty-cycling causes many challenges, such as difficulty in …
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Ultra low power, high sensitivity secure wake-up receiver for the Internet of Things
… to circuit level requirements with optimized duty cycling. A low power architecture is presented utilizing a mixer-first architecture along with a low power free-running oscillator. The system is designed to be highly programmable in order to track the local oscillator frequency variations …
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Reducing the computational demands of medical monitoring classifiers by examining less data
… and evaluate data reduction methods based on duty cycling, sensor selection, and combinations of the two. Random duty cycling was applied to an online algorithm that performs risk assessment of patients with a recent acute coronary syndrome (ACS). We modified an existing algorithm that …
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An energy-efficient communication system for ad hoc wireless and sensor networks
… over IEEE 802.11. The system is composed of a duty cycling and pseudo-random Medium Access Control (MAC) that provides deterministic access to the shared medium. Furthermore, the MAC provides link level QOS to support high data rates required for real-time traffic as well as delay-bounded …
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An Energy Aware and Secure MAC Protocol for Tackling Denial of Sleep Attacks in Wireless Sensor Networks
… on the other hand, involves exploring duty cycling and simulating three Media Access Control ( protocols Sensor MAC, Timeout MAC andTunableMAC under different network sizes and measuring different parameters such as the Received Signal Strength RSSI) and Link Quality Indicator ( …
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Energy-Efficient Medium Access Control Protocols and Network Coding in Green Wireless Networks
… turn on and off their radio transceivers (i.e., duty cycling) during periods of no transmission and reception (i.e., when they are listening or overhearing). Validation through analysis, computer-based simulation, and experimentation in real hardware shows that the proposed MAC solutions can …
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Wireless sensor network implementations on a testbed platform
… and shown to be superior in performance, to duty cycling, which is the current standard for power efficiency in a sensor network. The implementations of the data efficient quickest change detection and the energy efficient sleep control for tracking algorithms both work well, and encourage …
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Ultra-Miniaturized, Secure Wake-Up Receiver Based on THz Carrier Wave
… can be reduced to 750 nW with within-bit duty cycling. The WuRx has been tested at a distance of several meters and paired with a beam-steerable THz reflectarray, demonstrating its potential for real-world applicability.
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Cross-layer energy optimisation of routing protocols in wireless sensor networks
… example, to time-stamp sensor samples and for duty cycling of nodes. Alsomany routing protocols require that nodes communicate according to some predefined schedule. However, independent distribution of the time information, without considering the routing algorithm schedule or network topology …
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Circuits and protocols for low duty cycle wireless systems
… efficiency is needed. Additionally, aggressive duty cycling is needed to operate these IoT devices in severely energy-constrained applications. Wireless communication, which consumes a large fraction of the power in these devices, is the primary focus of this thesis. We present circuit (active …
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Communication and energy delivery architectures for personal medical devices
… management solutions are proposed that leverage duty-cycling to achieve enabling power consumptions that are at least an order of magnitude lower than previous work. Clinical measurements show the first system demonstrated to sustain itself with a mammalian-generated electrochemical potential …
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Resource management in sensing services with audio applications
… same energy consumption, when compared to the duty-cycling approach. Furthermore, the guided-processing approach is also generalizable to graph-based systems. Resource-efficiency in the multiple-application setting is achieved through the feature-sharing principle. Once applied, the method …
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An all-digital transmitter for pulsed ultra-wideband communication
… employ simple modulation schemes and aggressive duty-cycling. Due to their inherently duty-cycled nature, pulse-based Ultra-Wideband (UWB) systems are amenable to low-power operation by shutting off circuitry during idle mode between pulses. Furthermore, the use of non-coherent UWB signaling …
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Low power circuits with integrated magnetics for sensors and energy harvesting systems
… uses mixed signal front-end design to en-able duty cycling and quick convergence techniques leading to 20x reduction in power consumption at low bandwidths of 1 kHz for power monitoring. It also employs fast read-out circuits to achieve a bandwidth of 125 kHz for machine health diagnosis. For …
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Low Power Adaptive Wireless Circuits for the Internet of Things and In-body implants
… 80dBm sensitivity using a packet structure and a duty cycling scheme compliant with the Bluetooth Low Energy advertising protocol trading off power with latency. Event-driven applications achieve power lower than 240nW from a 0.75V supply while latency-critical systems wake up in almost 200 …
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Low power rf transceivers
… performance. These techniques are based on duty cycling the transmitter and receiver and are possible because of the discontinuous nature of the On-Off Keying signal. In order to ease the sensitivity requirements of the baseband receive amplifier a design methodology for large output voltage …
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High power li-Ion battery performance: a mechanistic analysis of aging
… density, high power density and increasing cycling life, LIBs are a well-founded technology for its use on portable electronic devices, electric vehicles (EVs) and electrical energy storage (EES) systems. The extensive use of LIBs accentuates the fact that these power sources are currently …
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Quantifying microbubble streaming and its applications
… in the flow field, achieved here through a duty cycling of the streaming flow (i.e., of the driving ultrasound). It is then shown using numerical simulations that the mixing is optimized at specific duty cycles that can be understood from global transport properties of the Poiseuille flow …
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