The Experts below are selected from a list of 3786 Experts worldwide ranked by ideXlab platform
K D Muellerglaser - One of the best experts on this subject based on the ideXlab platform.
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a simplified protocol for energy self sufficient sensors in an ieee 802 15 4 Zigbee wsn
International Conference on Intelligent Sensors Sensor Networks and Information Processing, 2009Co-Authors: Lukasz Niestoruk, Johannes Schmid, Peter Boll, Wilhelm Stork, K D MuellerglaserAbstract:For the application of wireless sensor network technology in an energy self-sufficient condition monitoring appliance, we propose a new hybrid network topology to combine the advantages of the Zigbee Standard with the need for lowest power consumption when applying an energy harvesting solution for a subset of the sensor nodes. For a research project on a wireless condition monitoring system, we developed a prototype implementation of a partly energy self-sufficient wireless sensor network. We adapted the Zigbee network protocols so that the energy consumption of the self-sufficient nodes is reduced albeit a Zigbee conform communication with the rest of the network is still ensured. In this paper, the prototype system is presented and the problem when applying a full Zigbee stack is stated. We propose to shift parts of the network functionality from the end-devices to the (mains- or battery powered) routers and show actual measurement results and calculated values to indicate the improvements of this adapted hybrid topology.
Sanggug Lee - One of the best experts on this subject based on the ideXlab platform.
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a low power cmos direct conversion receiver with 3 db nf and 30 khz flicker noise corner for 915 mhz band ieee 802 15 4 Zigbee Standard
IEEE Transactions on Microwave Theory and Techniques, 2006Co-Authors: Trungkien Nguyen, Sanggug LeeAbstract:A low-power low flicker-noise receiver front-end for 915-MHz-band IEEE 802.15.4 Standard in 0.18-/spl mu/m CMOS technology is implemented. A power-constrained simultaneous noise and input matching low-noise amplifier (LNA) can be achieved by using a conventional inductive degeneration cascode amplifier with an extra gate-source capacitor. In combination with the LNA, a passive mixer showing low 1/f noise performance is adopted to convert the RF signal directly to the baseband signal. The measured results show a conversion gain of 30 dB and a noise figure of 3 dB with 1/f noise corner frequency of 30 kHz. Two-tone test measurements indicate -5-dBm input third-order intercept point and +45-dBm input second-order intercept point. The RF receiver front-end dissipates 2 mA from a 1.8-V supply.
Pangfeng Liu - One of the best experts on this subject based on the ideXlab platform.
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Distributed throughput optimization for Zigbee cluster-tree networks
IEEE Transactions on Parallel and Distributed Systems, 2012Co-Authors: Yu-kai Huang, Pi-cheng Hsiu, Ai Chun Pang, Pangfeng LiuAbstract:Zigbee, a unique communication Standard designed for low-rate wireless personal area networks, has extremely low complexity, cost, and power consumption for wireless connectivity in inexpensive, portable, and mobile devices. Among the well-known Zigbee topologies, Zigbee cluster-tree is especially suitable for low-power and low-cost wireless sensor networks because it supports power saving operations and light-weight routing. In a constructed wireless sensor network, the information about some area of interest may require further investigation such that more traffic will be generated. However, the restricted routing of a Zigbee cluster-tree network may not be able to provide sufficient bandwidth for the increased traffic load, so the additional information may not be delivered successfully. In this paper, we present an adoptive-parent-based framework for a Zigbee cluster-tree network to increase bandwidth utilization without generating any extra message exchange. To optimize the throughput in the framework, we model the process as a vertex-constraint maximum flow problem, and develop a distributed algorithm that is fully compatible with the Zigbee Standard. The optimality and convergence property of the algorithm are proved theoretically. Finally, the results of simulation experiments demonstrate the significant performance improvement achieved by the proposed framework and algorithm over existing approaches.
Lukasz Niestoruk - One of the best experts on this subject based on the ideXlab platform.
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a simplified protocol for energy self sufficient sensors in an ieee 802 15 4 Zigbee wsn
International Conference on Intelligent Sensors Sensor Networks and Information Processing, 2009Co-Authors: Lukasz Niestoruk, Johannes Schmid, Peter Boll, Wilhelm Stork, K D MuellerglaserAbstract:For the application of wireless sensor network technology in an energy self-sufficient condition monitoring appliance, we propose a new hybrid network topology to combine the advantages of the Zigbee Standard with the need for lowest power consumption when applying an energy harvesting solution for a subset of the sensor nodes. For a research project on a wireless condition monitoring system, we developed a prototype implementation of a partly energy self-sufficient wireless sensor network. We adapted the Zigbee network protocols so that the energy consumption of the self-sufficient nodes is reduced albeit a Zigbee conform communication with the rest of the network is still ensured. In this paper, the prototype system is presented and the problem when applying a full Zigbee stack is stated. We propose to shift parts of the network functionality from the end-devices to the (mains- or battery powered) routers and show actual measurement results and calculated values to indicate the improvements of this adapted hybrid topology.
Daeyoung Kim - One of the best experts on this subject based on the ideXlab platform.
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neighbor table based shortcut tree routing in Zigbee wireless networks
IEEE Transactions on Parallel and Distributed Systems, 2014Co-Authors: Taehong Kim, Seong Hoon Kim, Jinyoung Yang, Seongeun Yoo, Daeyoung KimAbstract:The Zigbee tree routing is widely used in many resource-limited devices and applications, since it does not require any routing table and route discovery overhead to send a packet to the destination. However, the Zigbee tree routing has the fundamental limitation that a packet follows the tree topology; thus, it cannot provide the optimal routing path. In this paper, we propose the shortcut tree routing (STR) protocol that provides the near optimal routing path as well as maintains the advantages of the Zigbee tree routing such as no route discovery overhead and low memory consumption. The main idea of the shortcut tree routing is to calculate remaining hops from an arbitrary source to the destination using the hierarchical addressing scheme in Zigbee, and each source or intermediate node forwards a packet to the neighbor node with the smallest remaining hops in its neighbor table. The shortcut tree routing is fully distributed and compatible with Zigbee Standard in that it only utilizes addressing scheme and neighbor table without any changes of the specification. The mathematical analysis proves that the 1-hop neighbor information improves overall network performances by providing an efficient routing path and distributing the traffic load concentrated on the tree links. In the performance evaluation, we show that the shortcut tree routing achieves the comparable performance to AODV with limited overhead of neighbor table maintenance as well as overwhelms the Zigbee tree routing in all the network conditions such as network density, network configurations, traffic type, and the network traffic.
