Any guidance on converting Time Domain to Frequency Domain in Matlab
@Nimit. I recommend that you study and learn to design and implement what are called 2nd-order IIR lowpass filters. Once you thoroughly understand such filters you should design a 2nd-order IIR lowpass filter, that has unity gain at zero Hz, and experiment by applying your noisy signal to that filter and see how much noise reduction is achieved. Then you should apply your noisy signal to a cascade of two identical 2nd-order IIR lowpass unity-gain filters and see how much noise reduction is achieved. Finally you should apply your noisy signal to a cascade of three identical 2nd-order IIR lowpass unity-gain filters and see how much noise reduction is achieved. Nimit, you have much experimenting to do.