In 1992, ITU allocated the 2-GHZ band frequencies for the 3rd generation mobile radio communication system (IMT-2000) which can realize global service in the world. This system will be introduced around 2001 in Japan after the technical standard is regulated. It is very important to evaluate the characteristics of the interference with the Mobile satellite System (MSS) and existence satellite system when introducing IMT-2000 at 2-GHz band in the domestic market-Based on an official requisition from MPT. Existing MPHPT (Ministry of Public Management, Home Affairs, Posts and Telecommunications), the technical group which was organized by the Association of Radio Industries and Businesses has investigated the interference between IMT-2000 and the 2 GHz band other service systems. This paper presents the result of the electric field strength data measurements on the interference effects between the 2 GHz band communication systems. It shows the major interference models and the system of our experiments, and reports the flied performance between MSS system, Science satellite systems and DS-CDMA system on the 2 GHz band and the unmatched polarization propagation characteristics in the wideband system.
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