We consider the properties of a class of non-oversampling N-tone sigma-delta modulators which have applications in the design of UWB-OFDM communications systems. The spectrum gaps that exist in such systems are well-matched to the noise shaping properties of these modulators and their non-oversampling nature makes them practical for use with these ultra wideband signals. Performance results for first-order, second-order and L th-order modulators are presented, and a general expression for the excess resolution that can be gained in such systems is obtained.
|Original language||English (US)|
|Journal||Proceedings - IEEE International Symposium on Circuits and Systems|
|State||Published - Sep 6 2004|
|Event||2004 IEEE International Symposium on Cirquits and Systems - Proceedings - Vancouver, BC, Canada|
Duration: May 23 2004 → May 26 2004