An evaluation method for the reflection coefficient of building walls

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Abstract
It is necessary to evaluate the effect of building wall reflection because the reflected waves interfere with radio communication systems in a built‐up area. As there are many kinds of unevenness on a building wall, the reflected wave consists of several waves that are reflected on different surfaces. The reflected wave has a strong frequency dependence. This indicates that the measurement of a single frequency is insufficient. Thus, an evaluation based on the measurement results at a wide frequency band is necessary.First, this paper shows that the reflection coefficient of building walls has a remarkable frequency dependence by the measurement results on a 26‐GHz band. The relationship between the frequency dependence and wall surface unevenness is also clarified. Second, an evaluating method using a probability distribution, which is effective for varying the reflection coefficient in the band, is proposed. Third, the reflection coefficient distribution considering various kinds of walls is approximated by a Rayleigh distribution. Finally, the probability distribution of a two‐time reflection coefficient is also derived and the correspondence of distributions between estimated and measured is discussed.

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