how to demodulate the infrared signal in LabVIEW

Hi,

I hope some one can share your knowledge on how to demodulate the infrared signal using LabVIEW.

I modulate the infrared (IR) light using the counter pulse generation with frequency of 500Hz and 50% duty cycle. A photodiode is used to acquire the PPG signal based on the IR modulation. And now, how am I able to demodulate the IR signal.

Thank you.