In this talk, the unique characteristics of ultra wideband (UWB) communications systems are introduced. Receiver design considerations are presented. Focus is on the relation between the symbol duration and the delay spread of the channel. This determines whether the receiver should use a Rake receiver (Spread-spectrum system) or an equalizer (multiple carrier or OFDM system).
Robert H. Morelos-Zaragoza. "Ultra-Wide (UWB) Communications: New Paradigms and Opportunities." Faculty Publications (2004).