基于MATLAB的TD-SCDMA通信系统的调制与解调仿真程序设计论文.docx

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/view/390627.htmITU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/view/131570.htm3GPP（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/view/18255.htm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/view/3923.htm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；QPSK；8PSK；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 telecommunications.This article describes the modulation and demodulation of the basic principles of TD-SCDMA communication system, on the basis of the first QPSK modulation and 8PSK modulation mode in the MATLAB simulation environment to build a TD-SCDMA communication system simulation model of the data modulation and demodulation,its working principle, construction methods and error performance is analyzed. Then a simple TD-SCDMA system according to the QPSK modulation and OVSF spreading code, the simulation model, the same its working principle, construction method and error performance analysis.Finally, simulation results obtained at the same SNR, QPSK modulation 8PSK modulation mode noise immunity, with spread spectrum modulat