Noise Compensation
Dear Aaronia support team,
I considered the "noise compensation" check box in the "IQ power Spectrum" block.
Can you please give some information about this option? dose it work like an moving average?
The "Noise Compensation" subtracts the known noisefloor (measured during calibration) from the measured signal in the power domain, to correct weak signals, that would be elevated by the device noise. This example image ilustrates the problem. The signal measured is a sequence of frequences from 1415 to 1437 MHz, each 5dB weaker than the previous (blue reference line). The weak signals close to the noise floor (cyan line) are to high.
Enabling correction subtracts the noise floor, thus showing the actual signal strength of the weak signals.
Dear DevUS,
Thanks for the reply,
But how can you get the weak signal covered by noise in power domain? I mean imagine you even know the noise floor, how can you distinguish the real signal and noise when they have same power? Are you using kind of getting average of something?
As I know for compensating noise level I must know the exact IQ noise samples
OR
I must use the randomness property of noise and use some average (moving average in power domain or time compression in time domain)
sorry for my weak basics, but could you please let me know how dose the property works?
Please understand that the HOW can not be shared, this is our company´s IP.
OK!
so let me ask my question this way:
why this feature exclude my desire and real signal?
look at the following picture, in this image I used two just same configured "IQ power" blocks except the noise compensation button ticks
As you can see, my signals are not showed on the output
Uploaded files:
You might need to adjust the "Power Range" and try AVG trace instead...
This is what to expect in real life use. You get a much higher delta but only some dB better SNR:
