METHOD AND APPARATUS FOR DIGITAL UP OR DOWN CONVERSION USING INFINITE IMPULSE RESPONSE FILTER

摘要

The present invention relates to a digital up / down conversion method using a plurality of frequency converters for frequency conversion in a mobile communication system, the method comprising the steps of: inputting a filter coefficient having the same magnitude response as that of FIR filtering and being calculated by a Levinson polynomial, IIR filtering by a magnitude responsive IIR filter, filtering the IIR by a phase corrected IIR filter having a filter coefficient that receives the IIR filtered signal by the magnitude responsive IIR filter and corrects the nonlinear phase to a linear phase, And a digital up / down conversion apparatus using the IIR filter.;