Howtosignalprocessing
- WHAT IF signal-to-noise ratio is negative?
- Is negative SNR good?
- What happens when SNR decreases?
- Is positive or negative SNR better?
WHAT IF signal-to-noise ratio is negative?
The negative SNR means that the signal power is less than the noise power. The value of -30 dB is below the minimum SNR of -20 dBm @ SF12, so it does not guarantee that the receiver will be able to demodulate the signal.
Is negative SNR good?
Negative SNR (Signal to Noise Ratio) when expressed in dB just means that you have more noise than signal. For simple communications systems this means you have no useful signal and so can not make reliable estimates of the transmitted information.
What happens when SNR decreases?
If the SNR value gets lower than one, the signal becomes unusable. This is called the “noise floor.” Signals close to the noise floor can be subject to data corruption, which will result in retransmissions between the transmitter and receiver.
Is positive or negative SNR better?
As SNR is simply the ratio , and we know that ratio should be anything i.e positive or negative. But for practical case SNR should always be positive value means signal power should always be greater than the noise power. If it is negative than that system has no significance....
