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目 录

1 绪论 ………………………………………………………………………………………1
2 移动通信简介 ……………………………………………………………………………1
2.1 蜂窝小区形状与结构 …………………………………………………………………1
2.2 信道分配策略 …………………………………………………………………………3
2.3 多址技术 ………………………………………………………………………………4
2.4 频率复用 ………………………………………………………………………………6
3 算法设计方案 ……………………………………………………………………………7
3.1 蜂窝小区初始布局 ……………………………………………………………………8
3.2 电磁兼容性分析 ………………………………………………………………………10
3.3 频道向量 ………………………………………………………………………………13
3.4 频率分配原则 …………………………………………………………………………16
4 频率算法实现 ……………………………………………………………………………16
4.1 小区规划 ………………………………………………………………………………17
4.2 电磁兼容设计 …………………………………………………………………………18
4.3频道向量设计 …………………………………………………………………………20
4.4频率分配流程 …………………………………………………………………………21
5 C++程序设计………………………………………………………………………………24
5.1 C++语言概述 …………………………………………………………………………24
5.2 C++源代码 ……………………………………………………………………………28
6 实验结果 …………………………………………………………………………………29
结论 …………………………………………………………………………………………31
致谢 …………………………………………………………………………………………32
参考文献 ……………………………………………………………………………………33

附录A频率分配算法的C++源代码 …………………………………………………………35

摘要
由于无线用户的剧增，频率规划成为移动网络的一大难题。通过对现有移动通信系统的分析，设计出一种适用于中小型系统的频率分配算法。算法通过规划通信系统的小区初始布局，确定小区频道电磁兼容关系；运用动态的系数最小居后法，对频率电磁兼容矩阵进行分析计算，得到各个频道的分配难度系数，并按照“先难后易”的原则，将频率分配给各个频道。其中，重点分析了频率分配的具体设计方案，以及电磁兼容对同频干扰和邻频干扰的限制。算法最终采用C++编程经过调试，实现了对12个小区的固定分组的频率分配。经分析算法思路清晰，可以完成其他中小型系统的全局优化。

关键词 频率分配 电磁兼容 同频干扰 邻频干扰

Title Frequency Assignment Arithmetic Design in Mobile
Telecommunication System

Abstract
Because the number of wireless customers is increasing rapidly, frequency programming becomes a great hard nut to the mobile network. By analyzing the current mobile communication system, a frequency assignment arithmetic has been designed, which is applicable to small or medium scaled system. After layout the distribution of cells of mobile system, we obtain the electro magnetic compatibility relationship of cell channels; by using a method called dynamic state of minimum coefficient behind, we analyze and calculate the electro magnetic compatibility of frequency to get the difficulty coefficient of each channel. Then according to the principle of "first difficult, latter easy", the frequency is distributed to each channel. Among them, concrete design project of frequency allotment has been analyzed, and the limitation that the electro magnetic compatibility brings to both the same frequency interference and the adjacent frequency interference. Arithmetic adopts C++ to programme and debug, which realize fix frequency allotment for 12 small cells. Through the analysis, it tells us that the way of this arithmetic is in focus, and it could accomplish the overall situation optimization of other small or medium scaled system.

Key Words frequency assignment electro magnetic compatibility the same frequency interference the adjacent frequency interference

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