1. INTRODUCTION
Atrial Fibrillation (AF) is the most common sustained cardiac arrhythmia, increasing in prevalence with age, accounting for approximately one third of hospitalizations for cardiac rhythm disturbances [1]. AF is characterized by the replacement of consistent P-waves on the ECG by rapid oscillations (fibrillatory waves) that vary in amplitude, frequency, and shape, associated with an irregular ventricular response. AF affects approximately 10% of the population over age of 75 and is associated with an increased risk of stroke [2], [1]. Noninvasive analysis of AF and other supraventricular tach-yarrhythmia conditions require cancelation of the ventricular activity (QRS complex and T-wave) from the ECG [3], [4]. Due to the overlapping spectral contents of atrial and ventricular activities, linear filtering is not possible, and also the higher dominance of ventricular activity in the ECG makes the extraction of atrial activity non-trivial [5], [6].