用离散傅里叶变换解调数字调制信号  

Demodulation of Digital Modulation Signal by Discrete Fourier Transform

作　　者：崔琪琳[1] 田杜养[1] 周燕[1] 

机构地区：[1]西安石油大学电子工程学院,陕西西安710065

出　　处：《通信技术》2010年第2期4-6,共3页Communications Technology

摘　　要：文中介绍了一种基于离散傅里叶变换的新型数字解调器的设计,并对其进行了仿真。这种数字解调器以离散傅里叶变换为基础,通过对离散傅里叶变换结果中各次谐波幅值的判断可以很准确地从数字调制信号中将数字信号解调出。即使是在调制信号存在很大噪声的情况下,其解调结果的误码率也很小。由于它是对一定频率谐波振幅的分析,因此它适合于对数字二进制振幅键控和数字二进制移频键控信号的解调,是一种不同于传统数字解调器的结构既简单,性能又高的数字解调器。The article describes a new design of digital signal demodulator, including its simulation. This digital signal demodulator is based on DET （Discrete Fourier Transform）,and judged from harmonic amplitude of the DET result demodulate digital signal correctly from the modulated signal. The rate of demodulation error is very low even if there is strong interference within the modulated signal. It is an analysis on the specific frequency harmonic amplitude, thus suitable for demodulating Binary Amplitude Shift Keying（2ASK） signal and Binary Frequency Shift Keying（2FSK） signal. So it is a simple-structure and high-performance digital demodulator, and quite different from the traditional digital demodulator.

关 键 词：傅里叶变换 数字解调 FFT解调器 

分 类 号：TN91[电子电信—通信与信息系统]