Signal Strength Prediction and Distribution Characteristics in Indoor Radio Propagation at 2.5GHz Band

Kuninori OOSAKI
Yoshihiko AKAIWA
Hiroyuki SHIMIZU

IEICE TRANSACTIONS on Communications   Vol.E77-B    No.7    pp.962-970
Publication Date: 1994/07/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
microcell,  indoor,  radio propagation,  prediction,  distribution,  microwave,  

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In this paper, radio propagation in the medium-scale building is investigated at 2.5GHz band. In order to predict the propagation loss in any place, four major modes of propagation are considered: low-loss in line-of-sight (LOS) wave, corridor guided wave, direct transmission wave through obstructions, and the reentered wave. Based on the measured results of attenuation characteristics, the macroscopic parameters for the above mentioned modes of wave propagation are determined. Using these parameters, signal strengths are predicted with average standard deviation of 4.5dB. The fading characteristics are studied by measuring the Rician parameter and the correlation coefficient for 2-branch diversity antennas separated by 50cm. The Rician parameters are 2 in case of the LOS propagation, and 1 in case of the no LOS propagation. The two branch correlation coefficients are less than 0.5 within coverage of 80-95% in almost all the locations.