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| 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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