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《Journal of Beijing Institufe of Petrochemical Technology》 2002-02
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Simple Certification of Nyquist Rule

Wu Mingjie Liu Ronghua Tian Xianping (Department of automation ,Beijing Institute of Petro-chemical Technology, Beijing 102617)  
The important performance of digital communication system are the transmission speed and the reliability of system, which are restricted by each other. They obey an important basic theory of communication principle-Nyquist rule. In this article, Nyquist rule is proved using a simple method which is different from the traditional one that result in obstacle in teaching. Firstly a proposition is proved, then the general conditions of overcoming interference between codes are analyzed. Based on this point, the requirement of practical filter and the specific design method (rolling-decrease method in complementary symmetry way) for filter in digital communication system are presented. In this way, the interference between codes can be avoided and the reliability of communication system be improved. At last, Nyquist rule is described in popular words.
【CateGory Index】: TN911
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