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重庆邮电大学
毕业设计(论文)
设计(论文)题目:
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重庆邮电大学教务处制摘 要
CDMA(Code Division Multiple Access)MATLAB中SIMULINK丰富的通信模块库进行建模,通过MATLAB强大的数值运算能力对系统进行分析,从而获得直观的同步信道仿真波形,为实际通信信道的建立提供重要的参考依据【关键词】CDMA 仿真 同步信道 MATLAB
ABSTRACT
CDMA (Code Division Multiple Access) is a technology developed on the basis of the spread spectrum communication which is the branch of the digital communication technology. It is primarily used to assign different orthogonal (or be orthogonal as much as possible ) codes to different users for modulating signals , then to make multiple users simultaneously access systems and networks by using the same frequency communication modulate signals..
The downlink of system IS-95A ,at most, can transmit 64 channels at the same time, which are using orthogonal Walsh function code division channels on the PN sequence , and finally can transmit through the same RF.Using code division physical channel can send different function information and according to different functions we can classify the channels ,we call them logical channels. The downlink of logical channels include the pilot channel, sync channel, paging channel and the downlink channel. Synchronization channel is used to transmit synchronization information, then the mobile station use this information to do synchronous adjustment.
In the windows xp platform, using SIMULINK-rich communication module of MATLAB to model , can do analyses for systems with the powerful numerical computing capacity of the MATLAB in order to obtain intuitive synchronization channel simulation waveforms.It provides a important base for the establishment of the actual communication channel.
【Key words】Code Division Multiple Access imulation Synchronous channels MATLAB
目 录
摘 要 I
ABSTRACT II
前 言 1
第一章 绪论 2
第一节 移动通信发展历史 3
第二节 移动通信系统的组成 4
第三节 课题研究内容
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