Title :
Measurement of radio channels using an elastic convolver and spread spectrum modulation. II. Results
Author_Institution :
Inst. fur Mobil- und Satellitenfunktechnik, Kamp-Lintfort, Germany
fDate :
10/1/1994 12:00:00 AM
Abstract :
A spread spectrum measurement system using a surface acoustic wave convolver has been used to measure radio wave propagation in steel works at 1.75 GHz with an echo delay resolution of ≈20 ns. Due to the high metal content of the factory halls, path loss is found to be small and its exponent to range between 1.1 and 2.3 only. We observed a delay spread between 82 and 548 ns depending on the size of the steel mill, its construction and machinery. Characterizing the radio channel by a stochastic delay line model the echo amplitude probability distribution is found to fit a Rician or log-normal distribution rather than a Rayleigh distribution. The fit of the amplitude distributions is determined by a χ2 hypothesis test. From the channel impulse response the coherence bandwidth is deduced to range between 2.4 and 27.4 MHz
Keywords :
acoustic signal processing; data communication systems; delay lines; probability; radio applications; spread spectrum communication; steel industry; surface acoustic wave devices; surface acoustic waves; telecommunication channels; 1.75 GHz; 2.4 to 27.4 MHz; 82 to 548 ns; Rician distribution; amplitude distributions; channel impulse response; coherence bandwidth; delay spread; echo amplitude probability distribution; echo delay resolution; hypothesis test; log-normal distribution; path loss; radio channel; radio channels; radio wave propagation; spread spectrum modulation; steel mill; steel works; stochastic delay line model; surface acoustic wave convolver; Acoustic measurements; Acoustic propagation; Acoustic waves; Convolvers; Milling machines; Production facilities; Propagation delay; Spread spectrum communication; Steel; Surface acoustic waves;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
