Abstract
This paper is designed to detect AM signals, evaluate its parameters and consequently provides demodulation procedure using the methods of Short Time Fourier Transform (STFT) and Discrete Fourier Transform (DFT) combined with two Dimensional Spectral Surface (2DSS). The proposed technique is noise robust since the energies of modulated signal and noise located in different position on 2DSS which could be discarded during the analysis. Comparing with the Hilbert Transform the proposed method can extract envelopes of different carriers transmitted in the same channel.
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