摘要：轨道交通在我们的日常生活中起到了很大的作用，人们的生活无疑离不开轨道交通，随着城市的发展，越来越多的轨道线路被建立，当然轨道交通的日常运行离不开信号的支持，无论是通信信号，控制信号或是业务信号。轨道交通每天的客流量也是将近一千多万人次，用户数量多了也意味着信号的带宽利用率也与之增加，但是众所周知，信号的频谱资源都是有限的，所以在组网方案的设计上就要考虑到既能满足信号带宽大，干扰要小，稳定性要好，能接入的用户数要多等等。81973

同频组网的组网频率点利用率高，干扰大，系统容量小，相对于同频组网，异频组网的系统容量大，但是对于频率资源的要求是非常高的。由于TD-LTE使用相对而言比较高的载频，而且各校区边缘的用户传输速率也比较高，在城市中大规模的不知蜂窝站点会无法避免地面对同频干扰的挑战，但是又如同之前所提到的，频谱资源有限的问题，所以本课题围绕着同频组网方式展开，而不是异频组网方式。

本论文主要会从两个方面：轨道交通LTE基站设计时期和后期降低干扰，针对于轨道交通现网中的四种同频组网的干扰情况入手，主要从理论的角度研究出合适的同频组网的方案，并通过相应的依据适当地证明。

毕业论文关键词：同频组网；干扰避免

Design of LTE Co - frequency Network Scheme for Rail Transit

ABSTRACT：rail transit in our daily life has played a significant role in people's lives can not be separated from the rail transit, with the development of the city, more and more track lines are established, of course, the daily operation of rail transit can not do without Signal support, whether it is a communication signal, a control signal or a traffic signal。 Rail traffic daily traffic is nearly 10 million people, the number of users also means that the signal bandwidth utilization is also increased, but we all know, the signal spectrum resources are limited, so the design of the network program It is necessary to take into account both to meet the signal bandwidth, interference is small, the stability is better, the number of users to access and so on。

The networking frequency of the same frequency is high, the interference is large, the system capacity is small, and the system capacity of the different frequency network is large, but the requirement for the frequency resource is very high。 Because TD-LTE uses a relatively high carrier frequency, and the user's edge of the campus transmission rate is relatively high, in the city of large-scale I do not know the cellular site will be unable to avoid the same frequency interference challenges, but the same As mentioned before, the spectrum of resources is limited, so the subject around the same frequency network approach, rather than different frequency networking。

 This paper mainly focuses on two aspects: the reduction of interference between LTE base station design and the later period of the rail transit。 In view of the interference situation of four kinds of co-frequency networks in the rail transit network, the appropriate co-frequency is studied from the theoretical point of view Network of programs, and through the appropriate basis to properly prove。

Key words: same frequency network; interference avoidance

目录

1 绪论 1

1。1 课题的目的和意义 1

1。2 国内外研究现状与水平 1

1。3 发展趋势 2

2