摘要随机接入过程是移动通信系统中十分关键的部分。在蜂窝通信系统中，用户设备通过使用随机接入信号进行网络初始化接入、获得上行同步或者传递消息。用户设备只有在随机接入过程成功之后，才能被调度进行上行数据传输，进而与基站建立正常的双向通信链路。LTE（ Long Term Evolution）是第四代蜂窝通信系统的标准 。LTE系统采用Zadoff-Chu（ZC）序列作为随机接入的前导序列。随机接入的性能很大程度上取决于前导序列的性能。30149
本文主要研究基于LTE系统的随机接入信号。首先介绍了课题研究背景和意义，接着对随机接入的目的、触发情形、模式和过程进行概述，其次生成前导序列并且对LTE中前导序列的性质进行分析，最后，通过仿真，得出前导序列的检测性能，并与理论分析进行比较。
关键词 随机接入 LTE 前导序列 生成 检测性能
毕业论文设计说明书外文摘要
Title The research on random access signal in LTE system
Abstract
Random access process is a very important part in mobile communication system. In cellular communication system, random access signal is used by user equipment to initialize the access of signal,achieve up-link synchronization of the system and deliver the message. Only when random access process is successful, user equipment (UE) can be scheduled for transmission of up-link data, and then establishes normal two-way communication link with base station. LTE (Long Term Evolution) program is the standard of the fourth generation of cellular communication systems. Zadoff-Chu (ZC) sequence is used by UE as the preamble used for random access procedure .Random access performance relies heavily on the detection of preamble.
This paper focuses on the random access signal in LTE. Firstly, background and significance of this research is addressed. Secondly, we discuss about the purpose, the situation of trigger, mode and process of the random access. And then the random access signal’s generation and transmission are studied. Finally, through the simulation, it also concludes the detection performance of the preamble and then compares with the theoretical analysis.
Keywords random access LTE preamble generation detection performance
目 次
1 绪论 1
1.1 课题研究背景及意义 1
1.2 LTE介绍 1
1.2.1 LTE目标和需求 1
1.2.2 LTE物理层关键技术 2
1.3 文章结构及安排 3
2 LTE系统中的随机接入 4
2.1 随机接入的目的 4
2.2 随机接入的触发情形 4
2.3 随机接入的模式 4
2.4 随机接入过程 4
2.4.1 基于竞争的随机接入过程 4
2.4.2 无竞争的随机接入过程 9
3 LTE系统随机接入前导序列的产生和发送 11
3.1 随机接入前导序列的性质 11
3.2 随机接入前导序列的产生 12
3.2.1 前导序列的结构 12
3.2.2 前导序列的产生 13
3.3 前导序列的发送 14
4 LTE系统随机接入前导序列的接收及检测 17
4.1 前导序列的接收 17
4.2 前导列的检测 17
4.2.1 时域检测原理 17
4.2.2 频域检测原理 18
4.2.3 时域作相关和频域作相关的关系 19
4.2.4 判决门限T（threshold）的选择 19 LTE中随机接入信号研究+文献综述:http://www.751com.cn/tongxin/lunwen_25709.html