55 Works

2.1 - Real-Time Channel Sounding for Channel-Adaptive Data Links

A. R. Ganis, C. Bluemm, C. Heller & M. Loghi
The development of wideband mobile communications systems requires a good knowledge of the characteristics of the mobile channel as described by its impulse response. Such impulse response can be modeled as a tapped delay line with delays, amplitudes and phases associated with each tap. In order to obtain satisfactory estimates of these parameters and to determine delay spread, Doppler spread and the channel scattering function, a real-time channel sounder is required. This paper focuses on...

1.6 - HAZARD2 project : airspeed and temperature measurements in jet engine blast

T. Boisson
For ground airport operations, a dangerous area is defined behind the aircraft when engines are running. Measuring the temperature and airspeed in this area is needed to calibrate simulation models and adjust the danger area size to the real conditions. A heavy fixed on ground instrumentation was possible but an innovative solution has been chosen, based on Lidar technology for airspeed measurements and Bragg sensors on optical fibers for temperature measurements.

2.4 - Characterisation of Channel Usage in ISM/SRD Bands

H. Lieske, F. Beer, J. Robert, A. Heuberger & G. Kilian
Spectrum occupancy measurements for sub-GHz unlicensed frequency bands at two distinct inner city locations are presented in this paper. Short time measurements of spectrum utilization in three different bands are followed by a long-term observation of a selected sub-band over 7 days. The antenna in the latter measurement has an exposed position, which is typical for a fixed base station of a data aggregation network. For a selected frequency range, important signal characteristics (e.g. signal...

1.2 - An Introduction to achieving Industrial Applications of Wireless Passive SAW Sensors for Advanced Monitoring

G. Heider
Surface Acoustic Waves (SAW) is a powerful technology enabling the design of innovative wireless passive sensors for temperature, strain or pressure measurements for instance. SAW technology exploits the piezoelectric properties of the sensors’ quartz substrate. Wireless SAW sensors are powered by the energy of radio waves emitted by the associated transceiver unit when remotely interrogating the sensors in real-time. Advanced interrogation methods implemented in the embedded firmware of the transceiver compute the frequency changes in...

1.1 - Wireless and Battery-less Sensor Using RF Energy Harvesting

C. Merz, G. Kupris & M. Niedernhuber
The contribution introduces a RF energy harvesting circuit which can be used to power a wireless and battery-less sensor system. The sensor can be powered wirelessly over a distance of about two meters. The basic principles of RF energy harvesting are explained, it is shown how the system can be designed and special considerations are discussed. The proposed RF energy harvesting system operates at a frequency of 866.6 MHz, so that far field propagation is...

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  • 2014
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