An Analysis on Optimum Condition for Polarization Diversity Reception under Indoor Radio Propagation Environments
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In this paper, in order to reduce the fading signals measured by a vehicle in motion in indoor building, a polarization diversity reception method is considered. The polarization characteristic of the indoor radio wave is analyzed theoretically. Signal strengths are measured by using a circularly polarized antenna and vertically, horizontally polarized antennas in LOS(line-of-sight) and NLOS(non-line-of-sight) environments, and then reduction degree of the fading are analyzed. Using the correlation coefficient for the polarization diversity branches, the diversity effect is also evaluated. From the evaluation results it was found that the effective fading reduction method in indoor radio environments is to create LOS condition between the transmitting end and the receiving end, and then to form the polarized diversity branches at the receiving end by using a circularly polarized antenna at the transmitting end.
Abstract
In this paper, in order to reduce the fading signals measured by a vehicle in motion in indoor building, a polarization diversity reception method is considered. The polarization characteristic of the indoor radio wave is analyzed theoretically. Signal strengths are measured by using a circularly polarized antenna and vertically, horizontally polarized antennas in LOS(line-of-sight) and NLOS(non-line-of-sight) environments, and then reduction degree of the fading are analyzed. Using the correlation coefficient for the polarization diversity branches, the diversity effect is also evaluated. From the evaluation results it was found that the effective fading reduction method in indoor radio environments is to create LOS condition between the transmitting end and the receiving end, and then to form the polarized diversity branches at the receiving end by using a circularly polarized antenna at the transmitting end.