In radio, narrowband describes a channel in which the bandwidth of the message does not significantly exceed the channel's coherence bandwidth.
In the study of wired channels, narrow band implies that the channel over consideration is sufficiently narrow that its frequency response can be considered flat. The message bandwidth will therefore be less than the coherence bandwidth
of the channel. That is, no channel has perfectly , but the analysis of
many aspects of wireless systems is greatly simplified if flat fading
can be assumed.
Narrow band can also be used with the audio spectrum to describe sounds which occupy a narrow range of frequencies.
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