Extraction of Amplifier Fingerprints from Narrow Band Signal:Principle Analysis and FM Broadcast Experiment
Yiyu Zhou · Dianzi xuebao · 2008
A Multi-Channel Correlation Fingerprinting(MCCF) method utilizing the amplifier's non-linear property is proposed for specific emitter identification application.From amplifier's Taylor series model,we derived the Carrier Component(CC) and Harmonic Component(HC) expressions of the output signal.Then the MCCF method based on the least square algorithm was developed by substituting the CC into the HC as an approximation of the input signal.The observation condition and estimation CRLB of MCCF were provided.The fingerprints of MCCF depend on the Taylor series model,and are independent of the input signals,so they are inherent.The feature extraction experiment of four FM broadcast emitters in Changsha area shows that,the MCCF method works well,even when the HC is 60 to 80dB smaller than the CC.