Researches On Simulation Of The Mobile Communication Base Station In GSM

In the mobile communication systems, the main functions of the base station subsystem are divided into two parts. One is to complete the transmission, receiving, modulation, demodulation of wireless signals and management of radio channels. The other is to cooperate with the MSC in managing the mobile stations. Therefore, the BS is a bridge between the MSC and the MS.The thesis refers to the analysis and simulation about the key technologies such as roaming, hand-off, GMSK modulation and channel-assignment in GSM. Firstly, a better arithmetic is put forward after analyzing the arithmetic of location management used in roaming process now. Secondly, according to the signaling flowsheet, the hand-off process between cells is simulated with computer software. According to the modulation theory of GMSK, the input data are simulated. On the top of simulation, signal graph and phase-path of the GMSK are painted. During the simulation process of channel assignment, a prime proportion of the fixed channel numbers and the dynamic channel numbers is put forward after founding the state-transferring model of channel occupied.The thesis will be applied widely during the communication theory and engineering.