Title :
Second-order sampling of wideband signals
Author :
Valkama, Mikko ; Renfors, Markku
Author_Institution :
Telecommun. Lab., Tampere Univ. of Technol., Finland
Abstract :
Second-order sampling based digital demodulation technique is discussed and analyzed. Using a fractional delay filter, the modest image rejection of the basic second-order sampling scheme is improved to provide sufficient demodulation performance also for wideband receivers. Furthermore, a closed-form expression explicitly characterizing the obtainable image attenuation is derived. As illustrated by a design example, image attenuations in the order of 100 dB are theoretically achievable
Keywords :
compensation; delay filters; demodulation; digital filters; filtering theory; frequency response; signal sampling; closed-form expression; compensation; continuous time model; digital demodulation technique; fractional delay filter; frequency response; image attenuation; image rejection; second-order sampling; wideband receivers; wideband signals; Attenuation; Baseband; Delay; Demodulation; Filters; Image sampling; Receivers; Sampling methods; Signal sampling; Wideband;
Conference_Titel :
Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-6685-9
DOI :
10.1109/ISCAS.2001.921192
