# noise floor estimation

I want to estimate noise floor in the spectrum. I tested many methods using journals, but I couldn't find a stable method. Suggest that we have a spectrum consist of many signal and we want to estimate noise floor form signal.

• Is that over a set of real measurements? – A_A May 18 at 12:03
• Every time I comment on one of your questions, it's deleted a couple hours later, and I still always comment the same: What's the context of this? Noise floor measurements depend on what kind of noise you're expecting, and what kind of signal you want to keep out of that measurement, and for what purpose that measurment is made. – Marcus Müller May 18 at 18:18
• So, if you could, for every question you ask, always describe your motivation for asking it, that would be a really easy but effective improvement to our ability to answer them :) – Marcus Müller May 18 at 18:18
• @Marcus Müller I think you haven't information about my questions, My questions are obvious and except of you no body has problem with them. Please don't worrisome. – Velma Benedict May 19 at 10:37
• @A_A In a simulation environment. – Velma Benedict May 19 at 12:52

Median is a better choice to avoid biased results of noise floor but it will require sorting operation and based on the length of signal, that might be a problem and complexity increases as $$O(N.logN)$$.