what does it mean UWB systems is carrierless?

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sayyedjamal

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Hi there
what does it mean UWB systems is carrierless?
UWB does have modulation and modulation actually means carrier...
But i dont get it, what does it mean carrierless?
Thx
 

UWB does have modulation and modulation actually means carrier...
Click to expand...

no, modulation doesn't mean carrier
modulation is the information that can be superimposed onto a carrier
and as yura717 is hinting at in his link, the carrier can be suppressed as in SSB ( single sideband) DSB suppressed carrier ( Double Sideband)
Double sideband with carrier is basically AM

UWB or spread-spectrum transmission doesn't have a single freq. that can be considered the carrier freq

Apart from the SSB link in yura's post, also google spread spectrum transmission techniques

cheers
Dave
 
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