Digital quadrature demodulation of LFM signals obtained by lowpass filtering

被引：0
|
作者：
Behar, V [1 ]
Kabakchiev, C
机构：
[1] Technion Israel Inst Technol, Dept Biomed Engn, IL-32000 Haifa, Israel
[2] Bulgarian Acad Sci, Inst Informat Technol, BU-1113 Sofia, Bulgaria
来源：
NUMERICAL METHODS AND APPLICATIONS | 2003年 / 2542卷
关键词：
D O I：
暂无
中图分类号：
TP301 [理论、方法];
学科分类号：
081202 ;
摘要：
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 (0.0012degrees) if the optimal equiripple lowpass filter with only 6 elements is chosen for Q-component generation.
引用
收藏
页码：267 / 273
页数：7
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