Abstract
The implementation of an Intermediate Frequency (IF) filter in Digital Audio-VIsual Council (DAVIC) compliant modems is a particularly complex task. In previous works, we compared the performance of different designs (analog and digital) for the radio-frequency stage in a modem application. These designs have been evaluated for a particular case defined in the DAVIC recommendation. The design limits that were pointed out are mainly due, in the digital approach, to the high frequencies at which the IF stage must operate, and to the variation of the sampling frequency.In this paper, we propose a digital implementation of the IF filter based on the decimation technique. The evaluation of the performance has been performed using the PTOLEMY software from the Berkeley University.
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