基于Matlab的CDMA通信系统分析及仿真毕业设计（论文）.docVIP

摘 要 利用MATLAB平台的SIMULINK可视化仿真功能，结合CDMA的实际通信情况，利用MATLAB组建出完整的CDMA通信系统，完成整体设计方案，实现完整的发送到接收的端到端的CDMA无线通信系统的建模、仿真和分析 介绍了CDMA的主要环节（包括扩频技术、差错控制技术、调制技术、信道等）的参数设置。单用户在不同信道环境下，信道的噪声对结果影响很大，噪声功率越大，系统的误码率越大。多用户在相同信道环境下的仿真时，由于是采用了噪声功率为0.01W的信道传输环境，所以在单用户情况下误码率为0，而增加了用户数之后，误码率也随之增加。可见，信号在传输过程中，除了受到信道噪声的影响外，还存在多址接入干扰、单频干扰、窄带干扰、跟踪式干扰等，主要是多址接入干扰。 关键词：CDMA；通信系统；可视化仿真；MATLAB；SIMULINK Abstract MATLAB platform using SIMULINK simulation visualization features, combined with the actual CDMA communications, the use of MATLAB to form a complete CDMA communication system, the completion of the overall design, to achieve a complete end-to-end is sent to the receiver of the CDMA wireless communication system modeling , simulation and analysis ; Describes the key features of CDMA (including spread spectrum technology, error control techniques, modulation techniques, channel, etc.) parameters. Single-user channel in different environments, channel noise impact on the results, the greater the noise power, the greater the system bit error rate. Multi-user channel in the same simulation environment, as is the noise power of 0.01W transmission channel environment, so in the case of single-user bit error rate is 0, while the increase in the number of users, the error rate also increase. Can be seen that the signal during transmission, in addition to being the impact of channel noise, but also the existence of multiple access interference, and single-frequency interference, narrowband interference, jamming, such as tracking, mainly multiple access interference. Key words: Code Division Multiple Access;communication；system;visualizing simulation；MATLAB；SIMULINK 目 录 摘要 ……………………………………………………………………………I Abstract …………………………………………………………………………II 目录 ……………………………………………………………………………III 绪论 ………………………………………………………………………………1 1. MATLAB的形成和发展…………………………………………………………2 1.1 MATLAB的主要特点 ………………………………………………………2 1.2 MATLAB的发展现状 ………………………………………………………4 1.3 CDMA码分多址通信技术简介 ……………………………………………4 2. Matlab