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Narrowband: a channel in which the bandwidth of the message does not significantly exceed the channel's coherence bandwidth.'''Narrowband''': a channel in which the bandwidth of the message does not significantly exceed the channel's coherence bandwidth.Wideband: a channel in which the bandwidth of the message significantly exceeds the coherence bandwidth of the channel. Some communication links have such a high data rate that they are forced to use a wide bandwidth. '''Wideband''': a channel in which the bandwidth of the message significantly exceeds the coherence bandwidth of the channel. Some communication links have such a high data rate that they are forced to use a wide bandwidth. Ultraband: or Ultra-wideband is a technology for transmitting information spread over a large bandwidth (>500 MHz). Along with techniques such as pulse-position or time modulation the spectrum can be shared by multiple users with low transmit power.'''Ultraband''': or Ultra-wideband is a technology for transmitting information spread over a large bandwidth (>500 MHz). Along with techniques such as pulse-position or time modulation the spectrum can be shared by multiple users with low transmit power.