Measurement and Prediction of Two-Dimensional Fading Map in a Hallway (Special Issue on Personal Communications)

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As the demand of wireless personal communications networks increases, detailed characteristics of indoor radio propagation in UHF band are required. In this paper,multipath fading characteristics at 1GHz in an indoor mobile (walking speed) channel are investigated. By using a computer-controlled antenna scanner, signal strength was measured at 1400points with a quarter wavelength resolution, which forms a two-dimensional fading map. The fading characteristics were found to be mainly dominated by the signals through the LOS path and the reflected paths due to two side-walls and one front-wall. It is analytically shown that middle-scale (over three wavelengths)fading is caused by the reflection from the side-walls, and periodical small-scale (equal to or less than a wavelength) fading is caused by the reflection from the front-wall. A software simulator based on geometric optics was developed in order to predict the measured fades. A modified algorithm for the two-dimensional ray launching technique which removes the necessity of checking the "multiple-counted rays" is presented. Comparison between measurements and predictions shows good agreement highlighting the usefulness of the two-dimensional simulator as a tool for channel design.
社団法人電子情報通信学会の論文
1996-09-25