移动通信系统网络优化中干扰问题研究

毕业论文

题目：移动通信系统网络优化中干扰问题研究作者：

院系：信息工程系

专业：通信工程

年级：2007 级

学号：

指导教师：

提交时间：

目录

摘要 (Ⅲ)

Abstract (Ⅳ)

引言 (1)

第1章移动通信网络及网络优化概述 (2)

1.1 移动通信系统概述 (2)

1.1.1 移动通信系统的组成 (2)

1.1.2 移动通信系统的特点 (3)

1.1.3 移动通信系统的发展情况与展望 (4)

1.2 移动通信系统网络优化概述 (5)

1.2.1 移动通信系统网络优化的内容 (5)

1.2.2 移动通信系统中网络优化的必要性 (5)

第2章干扰问题的原因与分析 (7)

2.1 网内干扰的原因与分析 (7)

2.1.1 同频或邻频干扰的原因与分析 (7)

2.1.2 互调干扰的原因与分析 (10)

2.1.3 直放站干扰的原因与分析 (11)

2.2 网外干扰的原因与分析 (12)

2.2.1 雷达站 (12)

2.2.2 CDMA基站 (12)

2.2.3 M900频段的无绳电话 (13)

2.2.4 其它同频段无线设备、干扰器 (13)

2.3 硬件故障导致的干扰分析 (13)

2.3.1 天线性能下降 (13)

2.3.2 天馈接头故障 (13)

2.3.3 天线接反 (13)

2.3.4 TRX故障 (13)

2.3.5 时钟失锁 (13)

2.3.6 其它导致干扰的现象 (13)

第3章干扰问题的可行性解决 (14)

3.1 网内干扰的解决 (14)

3.1.1 同频或邻频干扰的解决 (14)

3.1.2 互调干扰的解决 (21)

3.1.3 直放站干扰的解决 (22)

3.2 网外干扰的解决 (24)

3.3 硬件故障导致干扰的解决 (25)

第4章归纳总结 (26)

结束语 (27)

致谢 (28)

参考文献 (29)

摘要

移动通信近年来发展速度惊人，在市场需求的驱动下移动网络不断扩容，网络的规划也一再随之调整。建设周期短，发展速度快，前后工期的重叠进行，网络的建设无论在规划阶段以及后续的扩建工程中，均存在着一些质量问题，造成整个通信网络的各种资源不能得到合理的应用，资源大大浪费，还使得通话质量下降，服务水平低，网络运行效率低。为使得网络资源能够合理配置和应用，移动通信网络的网络优化工作已经成为移动通信运营商提高服务水平，保障通信质量的重要工作内容。网络优化工作是指对正式投入运行的网络进行参数采集、数据分析，找出影响网络运行质量的原因并且通过参数调整和采取某些技术手段，使网络达到最佳运行状态，使现有网络资源获得最佳效益，同时也对网络今后的维护及规划建设提出合理建议。网络优化的问题主要有无线接通率、掉话、干扰和切换四个方面，其中移动通信系统中的干扰问题是影响无线网络掉话率、接通率等系统指标的重要因素，它不仅影响了我们网络的正常运行，而且影响了用户的通话质量，是用户申告的主要原因之一。本文重点对网内干扰的原因进行分析与研究，针对同频、邻频、互调和直放站干扰，结合产生干扰问题的现实案例，准确的对网络中出现的干扰问题进行定位，制定优化方案，解决或减小干扰带来的网络问题，提高网络运行质量。

关键词：移动通信网络优化网内干扰同频干扰

Abstract

Mobile Communication is developing at an amazing speed.The market demand drives mobile network expand continually,and as a result the network programing is being adjusted.Because of the shorting cycle of the network building,its high developing speed,and the processing at the same time of the former and the later construction period ,the building of network exists some problems no matter in the programing period or the later expanding projects ,which leads to an unreasonable use of the resources in the whole communication network,and big waste of resources.It also makes the quality of connection reduce,the service level low,and the running efficiency of network low.To get a good configuration and application of the network resources,optimizing network of the radio communication has become the major work of the operating agencies to improve their service level and insure a good quality of communication. Optimizing network means parameter acquisitions,analyses of the network that is put into operation,then to find out the reasons affect the quality in running and to adjust parameters and some technique means so that the network can reach a best running status and the resourse can get best benefit,it also give suggestions to the process of later maintenance,programming and building.The main problems of Optimizing network are wireless call completing rate,drop call,interference and switchover.Among these interference is the main factor of affecting system indexes such as the ratio of drop calls in wireless network and call completing rate.It not only affect the normal running of our network,but also the quality of quality of connection of consumers ,it is one of the main reasons which are complained.The txet is mainly about the analyses and research of the reasons of the interference in inner network aimed at same channel,adjacent channel, intermodulation and repeater interference. With the help of real examples of interference problems,locate the interference problems in network accurately,make optimization scheme,solve or reduce the problems caused by interference and improve running quality.

Key words: mobile communication network optimization inner network interference the interference at same channel