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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...
Wireless Sensor Networks (WSN) are used in a great number of applications. Unfortunately the programming of each node is till now a problem that limits the diffusion of this technology in commercial applications. In fact, in order to meet the strict requirements of the WSN, such as power optimization, specific operative systems (TinyOS) and programming languages have been used. On the contrary, the...
Wireless communications in the industrial automation world still suffer from lack of standardization. WirelessHART, released in September 2007, is still the only open communication standard specifically designed for real-time process control applications. This paper presents an innovative distributed tool for capturing WirelessHART packets in the field. In fact, even if tools for compliance assessment...
Traditional wireless sensors rely on monolithic transceivers optimizing cost but offering a very low flexibility. On the other hand, microwaves in the GHz range are used for displacement and position sensing. In this work a new architecture for wireless sensors, called wireless ultra smart sensor, is introduced. The new sensor architecture is built using software defined radio concepts and it has...
In the last few years solutions adopted in industrial communication have been deeply changed thanks to the adoption of technologies borrowed from completely different areas. In particular, the advent of hybrid wired/wireless networks promises to greatly improve efficiency and scalability. However, their success will depend on the availability of standard solutions, that ensure multivendor compatibility...
A precise time synchronization is essential in many wireless sensor networking applications, e.g. in order to correlate observations of the same event from different sites or to efficiently share the wireless channel. Generally, wireless sensors are designed having in mind low cost and low power. In the past, several protocols have been suggested, each one with its pros and cons, aiming at the maximization...
In this paper we experimentally investigate performances of received signal strength indicator of real components for 2.4GHz RF environment, with particular attention to IEEE 802.15.4 compliant transceivers (it has been adopted an MC13192 from Freescale). Results can be used to detect limits, in terms of performance, of the recently proposed algorithms based on radio signal strength indication, as...
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