Base station polarization diversity reception in which signals are received by dual polarization (ex. f45" polarization) is discussed. A theoretical analysis is presented on correlation coefficient p between diversity branches, and received signal level decrease L caused by polarization difference at the base and mobile station. The generalized expressions of p and L are then derived. Measurements were also carried out at 900 MHz in an urban area. Consequently, it was found that the p and L values are expressed by three factors, p is lower than 0.6 and L is smaller than 2.5 dB. It is concluded that this polarization diversity reception can be used as an effective diversity reception.

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Absfract-This paper describes the result of measurements of the correction factor for buildings around a mobile station on UHF land mobile propagation characteristics. In order to express buildings around a mobile station quantitatively, four parameters are proposed: area factor of occupied buildings (a), extended-area factor of occupied buildings (a'), buildings volume over a sampled area @) and buildings volume over an extended-area @').The examination was carried out for each parameter in the 400 MHz and the 800 MHz bands. Consequently, it was clear that OL was a suitable parameter for buildings around a mobile station, considering the balance of prediction accuracy and the efforts required t o calculate a parameter.Paper approved by the Editor for Radio Communication of the IEEE Communications Society for publication without oral presentation.

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