Analysis And Research On The Indoor Integrated Coverage Inteference Of GSM/CDMA/PHS/WLAN/3G

With the rapid development of the wireless communication, the competition in the wireless yields began more and more intense among the wireless telecommunication corporations in China. Now China Mobil has GSM and DCS communication systems, China Unicom has GSM,CDMA and DCS communication systems, China Telecom and China Netcom have PHS and WLAN communication systems. The coming 3G communication system will be developed in this year. As the subscribers are not satisfied with outdoor mobile communication any longer, they hope the wireless services can be provided anywhere, especially indoors, and completely communication coverage will be the trend in the future. But different from the outdoor wireless circumstances, the indoors environment is limited and complexed, and how to solve the coverage and ensure the communication will be more difficult.The key objective on the wireless interference research and analysis among GSM/CDMA/PHS/WLAN/WCDMA (Wideband Code Division Multiple Access) systems is to solve the five systems coexsist in one building. Using the feasible insulation and interference restraining ways, we not only can reduce the project budget and avoid the repeated construction, but also can ensure the quality of the network communication, and realize the excellent coexistence of the five systems.We are focusing on the interference analysis among systems in the construction of five co-existing networks. The research method is composed of three sections: theory analysis, data analysis and implementation, experimental network data collection and verification. The theory analysis is based on wireless communication protocols, it combined with the criterion and rules of the construction of the wireless coverage indoors, use the mothod of the interference analysis affirming on different types of interference including stray interference, obstruction interference and intermodulation interferenc of network to calculate the isolation,also it sets the feasible intermodulation restraining degree. On the engineering construction, we use the POI (Point of Interface) to isolate the up-link and down-link, at the same time make other measures to reduce the interference and ensure the five coexsited systems can communicate nomally. At last it belongs to the construction phase. Finally, validate theory analysis through test data coming from one experiment and perform service test in the co-existence of different types of network.The outcome of this research will be an important part of feasibility research for co-existence of five types of network indoors and provide constructive suggestion on co-construction of different types of network and also important proofs for planning and optimization of wireless communication network. Because different operator control the different wireless network, the multi-operator coverage indoors has some difficult. The buildings with five network coverage only limited in some government importment towers and symbol constructions, so the coverage range and intensity is small, and the projects were not enough. So the research and test of the thesis provide the basis for setting the devices and apparatus criterian and make the technology standard, also it provide importment reference for the multi-network and multi-operator construction and designment, and make the importment issue for sparing the construction total invest.