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Today, wireless sensor technology is based on monolithic transceivers that optimize cost but have a rigid hardware architecture. In this paper, a new architecture for wireless sensors is presented. It is based on a software-defined radio concept and shows impressive adaptability to external conditions. The proposed architecture, which is called the wireless ultrasmart sensor (WUSS), enables the use...
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...
WirelessHART (WH) is a recently standardized wireless fieldbus. The connection between WH and the host plant network is obtained with Access Points and Gateways. These devices have complex (and costly) architecture, but do not offer flexibility with respect to new update of the specification, and have limited diagnostic capabilities. In this paper, the architecture of a smart WH Access Point, which...
This paper presents an experimental investigation aimed at evaluating the influence of the Analog to Digital (A/D) conversion section on the overall Software Defined Radio (SDR) behavior. An actual SDR platform has been set up and the main A/D conversion parameters, affecting the receiving path, have been experimentally evaluated. In particular, Signal to Noise Ratio (SNR), SIgnal to Noise And Distortion...
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,...
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...
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