| Paper: | SPCOM-P1.9 | ||
| Session: | Ultra Wideband Systems | ||
| Time: | Tuesday, May 18, 13:00 - 15:00 | ||
| Presentation: | Poster | ||
| Topic: | Signal Processing for Communications: Ultra Wideband Systems | ||
| Title: | HIGH-SPEED A/D CONVERSION FOR ULTRA-WIDEBAND SIGNALS BASED ON SIGNAL PROJECTION OVER BASIS FUNCTIONS | ||
| Authors: | Sebastian Hoyos; University of Delaware | ||
| Brian Sadler; Army Research Laboratory | |||
| Gonzalo Arce; University of Delaware | |||
| Abstract: | This paper introduces techniques to perform analog to digital(A/D) conversion, based on the quantization of the coefficientsobtained by the projection of a continuous-time signal over anorthogonal space. This framework for A/D conversion is motivatedby the sampling of an input signal in domains which may lead tolower levels of signal distortion and significantly less demanding A/D conversion characteristics. The A/D conversion distortion is reduced by assigning optimal bit rates according to the variance distribution of the coefficients. Moreover, since the quantization of the coefficients is realized at the end of a time window during which the signal is projected, the speed of the quantizers can be much lower than the one needed in conventional time-domain ADCs. In particular, we study ADC in the frequency domain which overcomes some of the difficulties encountered with conventional time-domain A/D conversion of signals with very large bandwidths, such as ultra-wideband (UWB) signals. | ||
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