| The interference of mobile communication systems is affecting the quality of the wireless network transmission reliability and is becoming one of the most important factors of communication quality, in order to ensure that mobile communication networks to operate effectively and all users can communicate noninterference, we need to assess and coordinate interference, this is one of the most important tasks in the design of wireless communication network, but also the beginning of the network construction, alteration, expansion, optimize the network is a question need to concern in various stages. This paper introduces the interference testing scheme and the selection principle before GSM-R network construction and using radio wave propagation theory put forward a new method to search interference source.Chapter I introduce the importance in assessing GSM-R interference in the process of network construction briefly, and introduce the paper work;Chapter II describes the wave propagation theory and the most commonly used Okumura - hata propagation model. According to radio wave propagation model with GSM-R uplink and downlink bands using MATLAB to simulate the path loss graph;Chapter III discusses the interference model and classification, bring out mathematical model of interference, in the light of the different frequency classify different interference source;Chapter IV focus on interference testing methods and test parameters selection, discuss testing methods classification and selection principal, combining radio wave propagation theory discuss in dynamic random testing how the intervals selected;Chapter V in light of the main interference of GSM-R is China Mobile sharing frequency so put forward a new methods to search interference source, and use mathematical model combining radio wave propagation theory modeling, using MATLAB program and gives the simulation results ;Chapter VI summed up the full paper and proposed future direction should be studied. |
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