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2004•Unpublished venueRequires access

Algorithm of software digital down converter

Fu Ce

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Abstract

The paper put forward a design NCO (numerical controlled oscillator) with phase accumulation algorithm and fraction ratio decimation filter with mixing linear interpolation algorithm and CIC(cascaded integrator comb) filter, so that the DDC (digital down converter) process could be implemented in software on general purpose DSP(digital signal processing) chip and afford greater flexibility. Matlab simulation for a decimation filter whose decimation ratio is 29/31 was made. The results indicate that the algorithm improves the speed of DDC and implements programmable NCO and decimation filter by design software DDC with high performance DSP. 6 figs, 7 refs.

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What this paper is about

The paper put forward a design NCO (numerical controlled oscillator) with phase accumulation algorithm and fraction ratio decimation filter with mixing linear interpolation algorithm and CIC(cascaded integrator comb) filter, so that the DDC (digital down converter) process could be implemented in software on general purpose DSP(digital signal processing) chip and afford greater flexibility. Matlab simulation for a decimation filter whose decimation ratio is 29/31 was made. The results indicate that the algorithm improves the speed of DDC and implements programmable NCO and decimation filter by design software DDC with high performance DSP. 6 figs, 7 refs.

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Available abstract

The paper put forward a design NCO (numerical controlled oscillator) with phase accumulation algorithm and fraction ratio decimation filter with mixing linear interpolation algorithm and CIC(cascaded integrator comb) filter, so that the DDC (digital down converter) process could be implemented in software on general purpose DSP(digital signal processing) chip and afford greater flexibility. Matlab simulation for a decimation filter whose decimation ratio is 29/31 was made. The results indicate that the algorithm improves the speed of DDC and implements programmable NCO and decimation filter by design software DDC with high performance DSP. 6 figs, 7 refs.

Key concepts: Decimation, Digital signal processing, Integrator, Cascaded integrator–comb filter, Digital down converter, Filter (signal processing), Computer science, MATLAB

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