Valle O.T.,University of Sao Paulo |
Budke G.,Federal University of Santa Catarina |
Montez C.,Federal University of Santa Catarina |
Pinto A.R.,Federal University of Santa Catarina |
And 4 more authors.
IEEE International Workshop on Factory Communication Systems - Proceedings, WFCS | Year: 2016
The use of wireless sensor networks (WSN) to support critical monitoring applications is becoming a relevant topic of interest. These networks allow a highly flexible approach to data monitoring and, consequently, a major breakthrough for several application domains, from industrial control applications to large building domotics and health care applications. One of the major impairments of using wireless networks to support critical monitoring applications is the electromagnetic noise, which may increase the packet loss ratio to unacceptable values. In this paper, we assess different techniques of cooperative communication and network coding that can be useful to mitigate the aforementioned problem. These techniques may be implemented in WSN nodes in conformance with the IEEE 802.15.4 standard, to reduce the impact of electromagnetic interferences upon the packet loss ratio. In this paper, we report an experimental assessment of the network coding and cooperative diversity techniques, where the network is subjected to a controlled electromagnetic interference inside of an anechoic chamber. The experimental results show that, by using these techniques, it is possible to increase the success rate of communication in typical electromagnetic noisy environments. © 2016 IEEE.
Mura A.,INRIM - Istituto Nazionale di Ricerca Metrologica |
Bastida K.,INRIM - Istituto Nazionale di Ricerca Metrologica |
Bastida K.,Inti Instituto Nacional Of Tecnologia Industrial |
Clivati C.,INRIM - Istituto Nazionale di Ricerca Metrologica |
And 6 more authors.
EFTF 2010 - 24th European Frequency and Time Forum | Year: 2010
At the beginning of 2009 INRIM, the Italian metrological laboratory, started a research activity in order to realize a low noise optical link. Two telecom fiber lasers at 1550nm have been locked on two independent notched ultralow expansion glass (ULE) Fabry-Pérot cavities. We present the thermal stabilization system, and report the finite-element analysis (FEA) made to precisely determinate the positions of the cavity supports. The sensitivity of optical axes length to acceleration is found to be less than 4.5 pm/g. Two different commercial lasers are stabilized by a Pound-Drever-Hall (PDH) technique and a stability of 6×10-14 is achieved at 1 s. Finally, the experimental set-up for the optical link is described and a first noise cancellation result on a 25 km long fiber is reported. © 2010 IEEE.