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Measurement of radio channels using an elastic convolver and spread spectrum modulation. II. Results

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1 Author(s)
Pietsch, W. ; Inst. fur Mobil- und Satellitenfunktechnik, Kamp-Lintfort, Germany

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

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Instrumentation and Measurement, IEEE Transactions on  (Volume:43 ,  Issue: 5 )