基于MATLAB的TD SCDMA通信系统的调制与解调仿真程序设计毕业论文.doc

本科毕业设计论文基于MATLAB的TD-SCDMA通信系统的调制与解调仿真程序设计摘要TD-SCDMA作为中国提出的第三代移动通信标准自1998年正式向httpbcomview390627htmITU提交以来已经历十多年的时间完成了标准的专家组评估ITU认可并发布与httpbcomview131570htm3GPP第三代伙伴项目体系的融合新技术特性的引入等一系列的国际标准化工作从而使TD－SCDMA标准成为第一个由中国提出的以我国httpbcomview18255htm知识产权为主的被国际上广泛接受和认可的无线通信国际标准这是我国httpbcomview3923htm电信史上重要的里程碑本文介绍了TD-SCDMA通信系统的调制与解调基本原理在此基础上先根据QPSK调制方式和8PSK调制方式在MATLAB仿真环境下构建了TD-SCDMA通信系统的数据调制与解调仿真模型同时对其工作原理构建方法和误码性能进行了分析接着根据QPSK调制方式和OVSF扩频码对一个简单的TD-SCDMA系统建立了仿真模型同样对其工作原理构建方法和误码性能进行了分析最后通过仿真结果得出了在相同信噪比情况下QPSK调制方式比8PSK调制方式抗噪声性能强具有扩频调制的系统比没有扩频调制的系统抗噪能力要强在相同速率下8PSK调制方式相对QPSK调制方式具有更高的数据吞吐容量关键词TD-SCDMA调制与解调QPSK8PSK误码率AbstractTD-SCDMA as the third generation mobile communication standard proposed by China since 1998 submitted to the ITU has experienced more than a decade the completion of the expert group assessment of the standard the ITU recognized and released and 3GPP Third Generation Partnership Project system integration technical characteristics of the introduction of a series of international standardization work so that the TD-SCDMA standard as first proposed by China Chinas IP-based international widely accepted and recognized wireless communication internationalcriteria This is an important milestone in the history of Chinas telecommunicationsThis article describes the modulationand demodulationofthe basic principlesofTD-SCDMA communication system on the basis ofthefirstQPSK modulationand 8PSKmodulation modeintheMATLAB simulationenvironmenttobuildaTD-SCDMA communication systemsimulation modelofthedatamodulationand demodulationitsworking principle construction methods and error performanceis analyzed Thena simpleTD-SCDMA systemaccordingtotheQPSK modulationandOVSFspreading code thesimulation modelthe sameits working principleconstruction methodand error performanceanalysisFinally simulation results obtained at the same SNR QPSK modulation 8PSK modulation mode noise immunity with spread spectrum modulation noise immunity than the spread spectrum modulat