Discussion
Which of the following does not belong with the others?
Thermal noise
Shot noise
Flicker noise
Adjacent channel interference
Answer: D
Adjacent channel interference is another transmitter's signal falling in the passband, so it is interference rather than noise: it is deterministic, it originates outside, and the remedy is filtering or channel planning rather than device design. The other three are random processes generated within the receiver's own devices. Keeping noise and interference separate matters because they are measured differently, specified differently, and cured differently, and a complaint of poor reception should be sorted into one or the other before anything else is done.
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