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The study of the synchronization problems in wireless sensor networks (WSNs) is increasingly significant. Some researchers found that the network topology has an important impact on the convergence performance of the synchronization in WSNs. According to the feature of WSNs, we use random geometric graph (RGG) to describe the model of WSNs. And the degree distribution in RGG is similar to binomial...
Duty cycle MAC protocols achieve high energy efficiency and they are widely used in wireless sensor networks. However, they often suffer long end-to-end latency due to multi-hop sleep delay and are not suitable for industrial applications. RMAC, which employs multi-hop reservation mechanism, shows great advantage in reducing end-to-end latency than other duty cycle MAC protocols. However, due to interference...
In order to provide a high performance receiving solution for Near Field Communication (NFC), this study presents a non-coherent solution based on energy detection receiving technology of Ultra Wideband (IR-UWB) Impulse Radio. And the circuit chip implementation of the proposed receiver is provided and designed in 0.18μm RF CMOS technology with 1.8V power supply to achieve data-rate of 250Mbps, low...
Relatively higher cost, worse extensibility of the monitoring points and weaker mobility are those disadvantages that widely exist in the wire data collection system of the traditional household facilities. This paper introduces a scheme for building a wireless sensor network in a larger scope, utilizing the advantages of ZigBee technology in lower power, lower cost, easier extensibility and convenient...
Non-line-of-sight (NLOS) errors have been considered as a killer issue for the multihop wireless sensor network (WSN) localization. Although there are some techniques that can be used to mitigate this kind of errors, they are not quite suitable for sensor networks because of the intensive computation, big amount of communication or the demand for prior information on LOS-NLOS channel conditions. In...
Reliable location estimation is an essential and fundamental issue for wireless sensor network. In order to find a localization algorithm robust to non-line-of-sight (NLOS) propagation errors in sensor network system, we analyzed some latest localization algorithms. Considering the application environments of the network, the energy consumption of nodes, the amount of computation and the location...
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