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Time delay spread and signal level measurements of 850 MHz radio waves in building environments

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1 Author(s)
Devasirvatham, D. ; Bell Communications Research Inc., Red Bank, NJ, USA

Time delay spread and signal level measurements of 850 MHz radio signals were made over inside-to-outside radio paths at two residential locations and an office building. Root mean square time delay spreads of up to 420 ns were encountered in residential environments. However, when a direct path was present, this improved to less than 325 ns overall, and even to 100 ns at one residence. Received power levels were around -40 dB, with respect to levels received at 0.3 m antenna separation, Under favorable conditions. In other cases, these relative levels varied from - 40 to - 80 dB. Median signal levels agreed well with continuous wave measurements made earlier at one site. No significant polarization dependence or floor level dependence were seen in these data.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:34 ,  Issue: 11 )