Modeling And Simulation Of Signal Layer Of EMC For Communication Systems

With the development of communication systems,EMC prediction between systemsget more and more attention.there are lots of EMC prediction methods. Up to now,amongall these prediction methods,the most popular one is the Four-Level-Filtration-Method.Inthis method, SNR is the prediction criterion to predict the EMC interference.we can getaccurate result when applying this method to analog communication system.but this methoddoes not apply to digital method.To solve this problem,the article provided a EMC prediction method based on bit errorrate.firstly，with a experiment on some people,a ber criterion is calculated for a speechintelligibility bigger than85%.then,use MATLAB SIMULINK to establish digitalcommunication models with different methods of channel encoding andmodulation/demodulation. The article analysis the simulation result.finally,according to thetheory of EMC prediction method,a complete software frame of digital communicationsystem EMC prediction is established.some of the functions of the prediction software indigital systems are achieved.This article does some research on EMC prediction methods on digital communicationsystems,solve the problem that there is’t a proper EMC prediction method for digitalsystems,and offer a theory and an engineering guidance for EMC prediction.