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Internet of Things (loT) aims at collecting data from billions of devices connected altogether. Despite there is no one technology able to cope with all possible scenarios, LPWAN solutions are emerging as viable technologies for implementing private, low-cost cellular like wireless networks. Distributed systems could leverage this approach as a driving technology for services as smart environment...
The paper deals with a new test bench for the assessment of time-related performance of wireless systems implementing the IEEE 802.15.4 with the Chirp Spread Spectrum (CSS) physical layer. The test bench has been designed in order to clearly evaluate the timestamping capabilities of an FPGA-based implementation of the IEEE 802.15.4 CSS. The key features are the full bandwidth capability and the extreme...
This paper deals with the application of the Chirp Spread Spectrum (CSS) modulation for the synchronization of wireless sensors. Chirp modulation is a well known technique for precise localization, originally developed for RADAR applications. When CSS is used for communication purposes, radio frequency pulses are modulated in order to convey also user data. This approach allows for robustness, thanks...
In the last year the automation systems in power substation start to rely on networks thanks to the introduction of the IEC 61850 standard. Besides, it generates a general interest on synchronization also in the field of substation automation systems. In fact, timestamping of critical events or synchrophasor measurements can have a great advantage from distributed synchronization protocols like IEEE...
The standards for wireless sensor communications usually do not pose severe constrains on time synchronization methods. In fact, when used for communication purposes, an overall time synchronization accuracy on the order of tens of microseconds is well enough. For this reason, timestamping mechanisms (the basic feature exploited by all algorithms) are often not specified. Real world transceivers,...
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