【作者】 苟建兵；

【导师】 惠晓威；

【作者基本信息】 辽宁工程技术大学 ， 计算机应用技术， 2004， 硕士

【摘要】 在移动通信系统中，基站分系统的主要功能包括两个方面：一方面它完成无线信号的发送、接收、调制、解调和对移动信道的管理，另一方面它配合移动交换中心完成对移动台的各种管理。它在移动交换中心和移动台之间起桥梁和纽带的作用。 本文主要对GSM系统中移动台穿越位置区漫游、越区切换、GMSK调制和信道分配等关键技术进行分析与仿真。首先是对漫游过程中现有位置管理算法进行分析，并提出了一种改进的位置管理方法。结合越区切换信令流程，在计算机上用软件实现了小区间的越区切换过程。根据GMSK的调制理论，对输入数据进行GMSK调制仿真，得出GMSK调制信号波形以及相位路径图。在信道分配的仿真中，建立了信道占用的状态转移模型，并在混合信道分配方案里推导出了固定信道部分与动态信道部分的最佳比例关系。 本文对基站的仿真研究在理论与工程应用中具有一定的实用价值。更多还原

【Abstract】 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.更多还原