Study on Features Extraction of Pseudo Code PM-Carrier FM Combined Signal Based on the PWD Transform
Huichang Zhao · Acta Armamentarii · 2007
The features of pseudo code PM-carrier FM combined signal include the pseudo code and the modulation frequency.The pseudo Wigner distribution(PWD) transform was used for extracting these features.The feature of the pseudo code was extracted by the amplitude output of PWD and correlative filter technology.The feature of the frequency modulation was extracted by the way of PWD transform on the signal which was processed by anti-phase operation according to the extracted feature of pseudo code i.e.position of phase changed abruptly.The simulation result shows that both the feature of FM and the feature of phase changed position caused by the pseudo code PM can be extracted effectively in SNR=3 dB.