Digital Quadrature Demodulation of LFM Signals Obtained by Lowpass Filtering View Full Text


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Chapter Info

DATE

2003-01-30

AUTHORS

Vera Behar , Christo Kabakchiev

ABSTRACT

An effective digital demodulation system based on the technique of Ho, Chan and Inko is designed for quadrature demodulation of signals with a linear frequency modulation (LFM). The influence of LFM-signal parameters on the quality of demodulation is studied. Two variants of a sampling frequency are chosen, and a set of lowpass filters for Q-component generation is designed for each variant of a sampling frequency. The quality of demodulation is estimated in terms of absolute amplitude and phase errors evaluated as a function of system parameters. The results obtained in simulations show that the optimal choice of a sampling frequency (48 MHz) enables to reduce the imbalance phase errors to minimum (0.0012°) if the optimal equiripple lowpass filter with only 6 elements is chosen for Q-component generation. More... »

PAGES

267-273

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/3-540-36487-0_29

DOI

http://dx.doi.org/10.1007/3-540-36487-0_29

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1043539903


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