文档介绍：东海科学技术学院
毕业论文(设计)
题目: 软件无线电中的数字变频电路设计
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2
软件无线电中的数字变频电路设计
罗俊
(浙江海洋学院海洋学院,浙江舟山 316000)
摘要
随着软件无线电技术越来越的被广泛地被应用到军事、气象、民用等各个领域当中,当代无线通信系统很多,例如,卫星通信系统,蜂窝移动通信系统等等。作为软件无线电的核心技术之一的数字下的变频技术也越来越受到人们的重视。
本文对软件无线电进行了简要的介绍,由于数字变频将数字中频信号转化为数字基带信号,在对基带部分的数字信号进行处理,所以数字变频就成为软件无线带你的关键技术之一。所以本文对数字变频中主要组成部分数字振荡器设计进行了详细的介绍。
软件无线电具有宽带、开放、易升级等基本特点,这就要求变频部分的数控振荡器必须能产生频率可调而且能分辨高的数字样本。数字变频技术由可编程的频率控制确定输出频率,具有频率控制灵活、频率分辨率高等优点,非常符合软件无线电的要求。
本论文就是设计出数字变频中数控振荡器电路,能通过数控振荡和数字变频等功能。本文主要对相位累加器设计,正弦幅值存储器设计,令NCO的硬件实现。
关键字:软件无线电;数字下变频(DDS);数控振荡器(NCO);数模转换
Abstract
With more and more of the software radio technology has been widely applied to the military, meteorology, civil and other areas among the many modern munication systems, for example, munication systems, cellular munication system and so on .As a core technology of software radio digital conversion technology under more and more attention.
This software gives a brief introduction to the radio, because of the digital conversion to digital IF signal into digital baseband signals in the baseband part of the digital signal processing, the digital conversion on a software radio with one of your key technologies. So this paper the ponents of digital frequency digital oscillator design described in detail.
Software radio has broadband, open, easy to upgrade the basic character and this part of the numerically controlled oscillator frequency to be able to generate high-frequency adjustable and can distinguish between the number of samples. By a programmable digital frequency technology to determine the frequency of control output frequency, with frequency control flexibility, the advantages of higher frequency resolution, is consistent with the requirements of software radio.
This thesis is the design of digital frequency in the digitally controlled oscillator circuit, through the numerical control frequency oscillator and digital functions. In this paper, the design of the phase accumul