A Time-Variant CIC-Filter for Fractional Sample Rate Conversion

摘要

Sample rate conversion (SRC) is an important functionality of software radio receivers for the demand of low power consumption and complex, and the designing anti-imaging and antialiasing filters is a main problem in SRC. In this document arbitrary rational is split to a part of 2~α and a part of fractional between 1 and 2, then designs a multi-stage conversion system with half-band filtering and time-variant cascaded-integrator-comb (CIC) filtering in receivers. The time-variant CIC filter is realized with the method of system state analysis on the normal CIC filters.