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Summary: Orthogonal Basis Expansion based Atrial Activity Reconstruction for
Atrial Fibrillation Electrocardiogram Analysis
Sandun Kodituwakku, Thushara D. Abhayapala, Rodney A. Kennedy
Abstract-- We propose a novel algorithm for extracting
atrial activity from single lead electrocardiogram (ECG) signal
sustained with atrial fibrillation (AF), based on a short-time
expansion of an orthogonal basis function set. The method
preserves the time variation of spectral content of the un-
derlying AF signal, thus time-frequency analysis of the AF
signal can be successfully performed. The new method is
compared to the standard average beat subtraction (ABS)
method using synthetic AF sustained ECG data. The orthogonal
basis expansion method has a higher correlation with the
original AF signal compared to the ABS method for a range of
signal to noise ratio (SNR) levels, and correlation is improved
by 16% at an SNR of 0dB. Time-frequency analysis of the
reconstructed AF signal based on Bessel distribution also shows
the superiority of the orthogonal basis expansion method over
ABS.
I. INTRODUCTION
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