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摘要本文主要设计实现了数字下变频模块中的数字混频器和低通滤波器。低通滤波器包括了积分梳状滤波器、有限长冲激响应滤波器以及半带滤波器。积分梳状滤波器中没有乘法运算，实现方便。FIR 滤波器采用了直接型的设计。半带滤波器是一种特殊的 FIR 滤波器，在 FIR的实现基础上进行系数的变化即可完成。数字混频器是直接数字合成频率与乘法器实现的。本文重点进行了乘法器的介绍。 本次设计过程中用到了 Quartus II、Matlab/Simulink 以及 DSP Builder 三种软件，并且充分利用了它们之间的转换关系。先利用 Simulink 进行初步的结构构造和仿真，再利用 DSP Builder 构造模型进行仿真得到模型文件，接着用 DSP Builder 中的 Signalcomplier 把它转换成 VHDL 语言，进行编译之后就可以下载到硬件上。19267
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关键词 数字下变频 低通滤波器 数字混频器
Title The design and simulation of digital converter Based on FPGA
Abstract
This article is designed to achieve digital mixer and lowEpass filter used in a digital
down conversion module.LowEpass filter includes integral comb filter, finite
impulse response filter and halfEband filter. Integral comb filter has no
multiplication.It is easy implementation and computing convenient. FIR filter is of
a direct form. And the half band filter is a kind of special FIR filter .So we can
simply change the coefficients of the FIR to complete the design. And the mixer is
the based on the direct digital frequency synthesis and multiplication. There is
only a introduction of multiplication.
The design process uses three software which contains QuartusII, Matlab /
Simulink and DSP Builder and takes full advantage of the conversion between
them. First,we use Simulink preliminary to get structural configuration and
simulation.Then use accordance with the idea to construct a new model to get the
model file, use Signalcomplier in DSP Builder to convert it into VHDL language,
compiled then you can download to the hardware.
Keywords Digital Down Conversion Lowpass Filter Digital Mixer DSP Builder
目 次
1 绪论 . 1
1.1 软件无线电概述 1
1.2 软件无线电中的数字下变频技术 . 2
2 理论基础 . 3
2.1 基本采样理论——奈奎斯特采样定理 . 3
2.2 整数倍抽取 . 5