improve fft signal quality

Dear all, Has someone tips how i can improve my fft signal quality? I have a SpO2 signal with round values. I have tried detrend, it works but improves my signal not that much.
Thanks

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dpb
dpb am 26 Okt. 2018
"I have a SpO2 signal with round values."
What does that mean?
Can you average?

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am 26 Okt. 2018

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dpb
am 26 Okt. 2018

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