L O SummaryMeasurement of multipath delay profile characteristics in the 2.6 GWz band has been carried out within a 2 x 1.5 km area in metropolitan Tokyo to investigate the feasibility of a high speed digital micro-cellular portable radio system.The measurement system has time resolution of 40 ns. In this paper we present the spatial variations of the power delay profile and the delay-Doppler spectra, and we show the cumulative distribution of the delay spread and the error rate caused by multipath in the micro-cellular propagation environment.
SUMMARYAntennas for private mobile communications are required to have enhanced performance and miniaturization in order to deal with high-performance mobile communications for the next generation. In this paper, with regard to the polarization diversity H antenna using the correlation between polarizations proposed as a base station antenna, the results of an analysis of the structure, characteristics, and effectiveness of the polarization diversity H-type antenna in an actual environment obtained from field experiments are presented. The polarization diversity H antenna has a turnstile H element for the horizontal polarization and a dipole for the vertical polarization. The optimum shapes of each polarization antenna are derived. Also, in the diversity configuration, a structure optimizing the directivity and mutual coupling is derived. A field experiment is carried out at 150 MHz, the frequency presently used for operations.
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