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RX level can be taken as receive signal strength report seen by DSP and referenced at antenna terminal. Any interference/incorrect loss or gain will
make RX level unmatched to sensitivity number.
So, it's an information for debugging.
Anything above noise floor can be detected and differenciated from noise.
However, the detected signal may be not as good as you want. For example,
if it is data the amount of error is intolerable. So, what you do?....increase the
level of the signal that can be received above noise floor for a specified error.
This level is called sensitivity in absolute values or S/N if measured in dB above the noise floor.
You can't do an infinite S/N because is imposible, communications free of errors
does not exist. For other hand, a big S/N or sensitivity is a waste of money.
Another note: spread sprectrum can be "received" below noise level but
can not be detected if the S/N is not the required after de-spreading. In other
words, spread spectrum is not different than non-spreaded communications.
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