On the potential of phase diagram analysis to identify the wide band modulations

The key element of the communication signals is the information carried out by the amplitude, frequency and /or phase changes. Therefore, detecting the signal's parameters is one of the main factors that helps us to have access to the information transmitted through it. Using the phase diagram representation of a signal, a concept characteristic to the field of nonlinear dynamic systems, we want to estimate the signal's parameters and highlight some features of the modulation techniques which were used. The great advantage of this approach is the capability of phase diagram representation to present the signal's phase continuity, very useful for an accurate tracking of the communication parameters, an important application field being the communication intelligence (COMINT), when the recognition of communication signals is one of the main objectives.