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Firstly it describes the development ,basic principle and application and propagation characteristic of mobile channel , then investigates the system structure of DAB transmitter and receiver separately and the key technology of realization of the digital audio broadcast system.And then discusses the system component of FFT －the demodulation module of OFDM .The 409- points FFT module employs a radix-4 decimation-in-frequency algorithm, includes arithmetic element , read and write address element ,twiddle factor element and control element , is realized by FPGA. In the end , the result is verified in the matlab .

首先概述了OFDM的发展、基本原理和应用以及移动信道的传播特性，接着分别研究了数字音频广播接收机和发射机的系统结构，以及数字音频广播系统实现的关键技术，然后详细论述了OFDM解调模块FFT的系统结构，主要研究了4096点FFT采用基－4按频率抽取实现的算法，整个FFT模块包括了运算单元、读写地址单元、旋转因子单元以及控制单元，并且在FPGA中进行了硬件实现，并在matlab环境下对结果进行了验证。

The most important processing hardware component is the central processing unit, which compreses the control unit and the arithmetic/logic unit.

计算机最主要的处理硬件就是中央处理器，它包括控制器和计算与逻辑处理单位。

At least one armature connects the optical component interface with the base.

在优选的实施例中，基底表面可以被固定到一光具座上。

For the problem of which detecting the defects in bonding Interface between an armor plate and a concrete component.

为此，本文对钢板脱粘情况进行了红外热像检测研究。

As an important component of Chinese paper cutting paper cutting art of the non-polar long history.

作为中国剪纸重要组成部分的无极剪纸艺术历史悠久。

It is an important component of art of national vocal music of our country to sing art in folk song.

民歌演唱艺术是我国民族声乐艺术的重要组成部分。

Navigation has been used in an effort to increase the accuracy and consistency of hip arthroplasty component position.

导航技术应用的目的是增加髋关节置换假体位置的精确性和一致性。

This is an important component of the Chinese people's musical artistry .

这是中国民间音乐艺术中一个重要的构成因素。

As a fundamental necessity of human beings, sex is the basic right of human beings. Therefore, the harmonious sexual relationship becomes an important component of a harmonious society.

性是人之为人的根本，是人的基本需要，和谐的两性关系是和谐社会的重要组成部分，而两性关系的和谐有赖于性文化建设。

ConclusionAs far as rouhuoside and icariin to be concerned, the content of rouhuoside is much higher than that of icariin in each month of the growing seasons of Epimedium wushanense, and rouhuoside is the main component in Epimedium wushanense.

巫山淫羊藿在其生长的任何月份都是柔藿苷含量远大于淫羊藿苷含量，柔藿苷是巫山淫羊藿中的主要成分。

We were cousins—his grandfather was King of Scots,and his great-grandfather was Henry VII of England.

我们是堂姐弟——他的祖父曾是苏格兰国王，他的曾祖父是英格兰的亨利二世。

I do want to help you, but I am in a quandary now!

我是想帮你，但是我现在左右为难啊！