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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。
This paper introduces a new digital demodulator based on discrete Fourier transform design, and its simulation. Based on Discrete Fourier Transform, this digital demodulator can accurately demodulate the digital signal from the digitally modulated signal by judging the magnitude of each harmonic in the discrete Fourier transform result. Even in the presence of significant noise in the modulated signal, the bit error rate of the demodulated result is small. Because it is an analysis of a certain frequency harmonic amplitude, it is suitable for digital binary amplitude keying and digital binary frequency shift keying signal demodulation, is a different from the traditional digital demodulator structure is simple, performance High digital demodulator.