Peak detection algorithm for ECG wave

We have proposed an algorithm for detection of the QRS complexes of ECG signals. There are three peaks i.e. P wave, QRS complex and T wave. Here we are detecting QRS complex. QRS complex wave detection is very important for the HRV analysis of ECG signal in biomedical engineering. We have used derivative of the signal to remove P Wave and T wave from signal. Band pass filter is used to remove noise such as baseline wander, power-line noise, and out of band noise. Squaring of the signal makes all data points positive. Squaring of the signal is taken to emphasize the higher frequencies i.e. predominantly the ECG frequencies.