The shortage of WVD in analyzing abnormal ECG signal

Biomedical signals are usually non-stationary, multi component ones. The use of time-frequency analysis can be inevitable for these signals. The choice and selection of the proper Time-Frequency Distribution that can reveal the exact multi component structure of biological signals is vital in many applications, including the diagnosis of medical abnormalities. In this paper, the instantaneous frequency techniques, using Wigner-Ville Distribution, is applied for analysis of biological signals. The simulation performed on normal and abnormal cardiac signals shows that the Wigner-Ville Distribution is able to detect the QRS complexes in the normal signal but fails to detect these complexes in the abnormal cardiac signal.