The Research Of Electromagnetic Radiation Predict System About TD-SCDMA Communication Base Stations

In recent years, with the rapid development of our country’s socio-economy and technology, a variety of electronic and electrical equipments and facilities are brought into people’s life and work. However, the following electromagnetic radiation pollution is increasing seriously. In fact, it becomes the fourth great pollution in our routine life right after the water pollution, air pollution and noise pollution.Out country’s mobile communication industry develops very fast. The3rd generation technology has been massive applied in this industry. TD-SCDMA is a3G standard whose intellectual property rights belong to our country. China Mobile undertakes the construction task and constructs massive TD-SCDMA network in the whole country. Compare with other kind of base stations, TD-SCDMA base station has more feedback wires, more power amplify factor and bigger antennas which means it has more serious electromagnetic radiation problem. In fact, there are many reports about the dispute caused by the radiation problems. With the enhancement of people’s health conscious and environment protecting conscious, the radiation problem of TD-SCDMA base station becomes a hot topic which people are very concerned about gradually. Scholars and researchers have been working on the electromagnetic radiation of GSM base station for several years. They accumulate a lot of experience and achieve a certain extent achievement. While little study has been done on the radiation problem of TD-SCDMA base station, that’s why I take it as my research topic. This paper aims to work out an electromagnetic radiation prediction system which can provide theory and science dependence for the government and give civil a correct guidance about the radiation brought by the base station.This paper begins with the engineering analysis of the TD-SCDMA communication base station. It calculates the electromagnetic radiation of smart antenna using the time division duplex-specific and smart antenna technology which are unique for TD-SCDMA. The third chapter introduces the establishment of a three-dimensional scene for the base station’s electromagnetic environment. The scene can search and show all the direct, reflection and diffraction paths being reflect and diffract by a building using the ray-tracing algorithm. In the sixth chapter, compare the measured data with the theoretical calculation result without the influence of the buildings, and then analysis the error,the results verify the rationality of the calculation about the smart antenna electromagnetic radiation. The next step is to compare the measured data with the theoretical calculation result with the influence of the buildings, and then analysis the error.,verify the feasibility of the forecast-software. At last, it works out a prediction system soft ware using the C++language on the VS2008development platform. This paper provides a method for the future study on accurately prediction system and makes a foundation for it.