An Improved RLS-based Interference Cancellation

Abstract

An improved algorithm for mitigating the effect of power line interference in electrocardiogram (ECG) recording systems is presented. The proposed algorithm includes an interference detector (ID), an interference fundamental frequency estimator (IFFE), and an interference estimator (IE). The ID is used to evaluate the existence of the interference before recording. If it is present, the IFFE and IE are employed in the next steps. In the absence of interference, the observed signal is directly sent to the recorder and monitor. The presence of the ID can improve the performance of the system in terms of computational efficiency and system speed. The IFFE can track the variation of the interference frequency. Extensive computer simulations were run to demonstrate the performance of the proposed system.