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无线通信系统数字前端关键技术的分析与应用

时间:2018-01-10 22:50来源:毕业论文
论文介绍了数字下变频的基本理论--带通采样定理以及抽取内插理论,分析了DDS的算法原理、积分梳状滤波器(CIC)和半带滤波器(HB)的组成和原理,给出了一种由基于DDS算法的数控振
摘要软件无线电技术是一种全新的无线通信技术,它的出现是无线通信技术从模拟化到数字化,从大规模到集成技术的又一次重大突破。它的核心内容是搭建一个具有标准化、模块化、开放性特点的多功能通用硬件平台,尽量的使用各种可以升级的、可不断更新参数的软件对无线电系统的组成模块的进行设计,使得系统的实现更加灵活。
本文是以无线通信系统接收机数字前端的组成及数字下变频模块的关键技术作为研究的对象。首先介绍了软件无线技术的相关理论和未来的发展趋势,并对无线通信系统的数字前端部分的组成作出了一定的讨论。由于数字下变频是无线通信接收机数字前端的一个关键组成成分,本毕业论文介绍了数字下变频的基本理论--带通采样定理以及抽取内插理论,分析了DDS的算法原理、积分梳状滤波器(CIC)和半带滤波器(HB)的组成和原理,给出了一种由基于DDS算法的数控振荡器,以及基于CIC滤波器、HB滤波器和FIR低通滤波器的数字滤波器组级联的方法实现的数字下变频结构方案,通过Matlab和Modelsim的仿真实现了对信号的下变频处理,得出了此方案可以完成数字下变频功能的结论,最后对全文进行了总结和展望,指出了工作过程中存在的不足及有待进一步研究的方向。关键词 软件无线电、接收机、数字前端、数控振荡器、数字下变频、CIC滤波器17415
毕业设计说明书(论文)外文摘要   
Title    Analysis and Application of the key technologies of wireless communication systems digital front.                    

源自六/维\论]文[网!加7位QQ324.9114 www.lwfree.cn


Abstract
Software Defined Radio technology is a new wireless communication technology , its emergence is another major breakthrough of wireless communication technology from analog and large-scale to digital and integrated technology. Its central idea is to construct a common hardware platform with standardized , modular and open characteristics, and to use varieties of software with scalable , reconfigurable radio parameters as much as possible to design the modules of the radio system, to make the system more flexible to implement.
The paper analyzed the construction of the digital front and digital down conversion module of the wireless communication system receiver. Firstly, the paper introduced the basic theory and the trends of the Software Defined Radio, and analyzed the construction of the digital front. Digital down conversion is a key component of wireless communication receiver's digital front. The paper introduced the basic theory of digital down conversion – band-pass sampling theory and the decimation interpolation theory, analyzed the algorithm principle of DDS and the composition and principle of CIC and HB, and presented a method combined with a numerically controlled oscillator based on DDS and a group of digital filters based on CIC, HB and FIR low-pass filter to implement the structure of digital down conversion. The paper used the simulation of MATLAB and Modelsim to implement the down conversion processing towards the signal, and achieved a conclusion that the method used in the paper could implement function of  digital down conversion, and finally made a conclusion and outlook of the whole paper, pointing out the inadequate of the work and the pending direction of future research.
Keywords Software radio; receivers; digital front; digital down conversion; numerically controlled oscillator; CIC filter
 目   次 
1  绪论… 1
1.1   软件无线电综述 1

源自六/维\论]文[网!加7位QQ324.9114 www.lwfree.cn


1.2   软件无线电的发展趋势  2
1.3  无线电系统的全链路结构  3
1.4  本文研究的主要内容  5
2  无线电系统的数字前端技… 7 无线通信系统数字前端关键技术的分析与应用:http://www.lwfree.cn/tongxin/20180110/19072.html
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