uwb Vs. Spread Spectrum communication

Both UWB & Spread Spectrum are using in wider bandwidth communication.
What is the difference between two ?

If we increase the Bandwidth, then power level will be too small. Then there is a probability to interpret the received signals as noise or affecting the transmitted signals by channel noise. How we can get rid of this problem ?

Increasing bandwidth for spread spectrum doesn't decrease power. It decreases power distribution in the frequencies but total power is still the same.

dknguyen said:

Increasing bandwidth for spread spectrum doesn't decrease power. It decreases power distribution in the frequencies but total power is still the same.

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-41 dBmW/Mhz right

Hey,
I'm not familiar with UWB, but with spread spectrum.

Spread-spectrum technology codes the input signal with orthogonal codes, and therefore allows many users to use the same RF spectrum (bandwidth) at the same time.

UMTS (WCDMA) uses spread-spectrum technique.