The concept of time-frequency-phase analysis [articol]

Abstract

The time-frequency representations constitute the main tool for analysis of non-stationary signals arising in real-life systems. There is a huge number of time-frequency approaches adapted for a wide class of signals. The common drawback is that these methods use only a part of instantaneous phase information. In this paper, we propose a new concept that takes advantage on time, frequency and phase characteristics of the signal. The extraction of timefrequency-phase characteristic are done in two steps : conventional time-frequency analysis and phase continuity analysis. The results will prove the efficiency of this concept in the case of two digital modulation types : FSK and PSK.