Understanding SNR
A strong signal alone is not enough for a broadband wireless receiver to work reliably. To work well, the level of the received signal must be consistently higher than the level of the received noise; in other words, the SNR must be high. A high SNR requires that both of the following conditions be met simultaneously:
The receiver must receive a signal that is at or above the receiver threshold level— The threshold is the level where the receiver wakes up, detects that a signal is present, and begins to successfully decode the signal. Part A of Figure 8-1 uses a decibel (dB) scale to show the relationship of the receiver threshold to the level of the incoming signal.
Figure 8-1. Relationship Between Receiver Threshold, Signal ...
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