Reduced complexity comb-filters for decimation and interpolation in mobile communications terminals
- 20 January 2003
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 1, 81-84
- https://doi.org/10.1109/icecs.1999.812228
Abstract
In mobile communications systems complexity and efficiency are issues of paramount importance. Therefore when implementing integer factor sample-rate conversion, comb-filters-especially cascaded-integrator-comb (CIC) filters-are a good choice of realizing linear-phase filters with low complexity. However, neither the direct implementation of comb-filters as transversal filters nor their implementation as CIC-filters are minimal realizations. Since both, decimators and interpolators are time-variant systems, the minimal realization is certainly time-variant also. Based on an equivalent block-processing structure of the original system such time-variant realizations can be found. In the case of comb-filters this results in halving the number of registers though at the cost of multipliers.Keywords
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