ESTIMATION OF CARRIER FREQUENCY,MODULATION TYPE AND BIT RATE OF AN UNKNOWN MODULATED SIGNAL

摘要

In this paper a method of parameter estimation is presented.The parameters of interest are the carrier frequency,modulation type and bit rate of a modulated signal.The method presented uses digital signal processing techniques to obtain the phase derivative from the analytic signal.The phase derivative is then used to findthe desired features.The presence of amplitude modulation is determined by the envelope of the analytic signal.This method is particularly well suited for real time applications.This is in contrast to previously given statistical methods based on descriminant analysis.The analytic signal method can be applied to a short time data record.It also requires less computational overhead than the statistical approach.