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Wireless sensor network (WSN) can be widely used in many fields. Based on 0.18μm RF CMOS process, this paper presents a 4.8GHz 1V low phase noise LC voltage controlled oscillator (VCO) used in the frequency synthesizer for WSN applications. In order to work under 1V voltage, the LC VCO uses the structure of only one couple of NMOS differential negative resistances. The core circuit is biased by PMOS...
Wireless sensor networks are distinguished from traditional networks. Existing routing algorithms are not effective in supporting such networks. In this paper, a novel quantum-inspired ant-based routing (QABR) algorithm for WSNs is proposed, and it has rapid convergence and good global search ability. Experiment results show that the proposed algorithm can find rapidly the optimal path from source...
The design method is proposed for the community health emergency ambulance system based on Zigbee. The front-end sensors monitor vital physiological data and diagnosis. When the patient needs help, rescue request is send to rescue centers through the wireless sensor network. And localization algorithm estimates the location information in order to rescue the patient at the first time. Experiment shows...
In Wireless Sensor Networks, it has been proved that the reliable transmission protocols sending redundant packets to the upstream neighbor hop-by-hop have advantage on energy efficiency compared with those using end-to-end error recovery and control scheme. While transmitting the redundant packets over error prone wireless links, there are two different ways could be used, which are single path and...
In Wireless Sensor Networks (WSNs), stochastic reliable transmission protocols, which improve reliability of the delivery process by transmitting redundant packets, have been proved to have advantage of energy efficiency over the retransmission one. But the burst and deep fading characteristic of the error prone wireless links in WSNs reduces the practicability of this kind of protocols. To solve...
In this paper, we propose a novel approach to emulate an arbitrary wireless multi-hop network scenario in a fixed wireless testbed, in which every node is equipped with a variable attenuator. We formulate the core problem of wireless multi-hop network scenario emulation as a constrained optimization problem and propose an optimum algorithm
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