基于matlab的cdma通信系统的仿真设计课程论文 东华大学.docVIP

东华大学研究生课程论文封面 教师填写： 得分 任课教师签名 年 月 日 学生填写： 姓名 徐慧军 学号 2121134 专业 电子与通信工程 导师 许武军 课程名称 通信系统建模 任课教师 郁进明 课程学分 2 上课时间 20 12 至20 13 学年 第 二 学期 星期 四 递交时间 2013年 月 日 本人郑重声明：我恪守学术道德，崇尚严谨学风。所呈交的论文，是本人独立进行研究工作所取得的成果。除文中已明确注明和引用的内容外，本论文不包含任何其他个人或集体已经发表或撰写过的作品及成果的内容。论文为本人亲自撰写，我对所写的内容负责，并完全意识到本声明的法律结果由本人承担。 论文作者签名： 第二次世界大战期间因战争的需要而研究开发对系统进行了性能分析，并作了进一步改进与调试。 The analysis and simulation of communication system based on Matlab Abstract A technology in wireless communication was called Code Division Multiple Access(Referred to CDMA) and it is the Core technology in 3G. CDMA technology was developed During World War II for the need of war. But it has been used in the military areas for a long time and was used in civilian areas until resent years. In china, it is in a few years that this technology began to thrive. At present, there are three methods to implement CDMA technology: W-CDMA put forward by Europe, CDMA2000 put forward by America and TD-SCDMA put forward by China. The common feature of these three technologies is CDMA. In fact, CDMA is composed of two technologies: CD and MA. The former is based on spread spectrum which has many advantages such as the ability to improve the suppression of narrowband interference, hiding signals in the background noise, the prevention of information eavesdropping，enabling many users to use one frequency band and so on. At our country, the market prospects of CDMA are very bright just because of the beginning of its prevailing .As result, this technology is an issue deserved to research. By grasping the basic theory of it through simulating CDMA via Matlab, I can lay the foundation for studying it deeper later. This paper includes the following contents: spread spectrum, mingling two signals, modulation, demodulation, adding noise, separating the two signals, minimizing error rate. Analyse performance through waveform, spectrum scope and making a further im