Mar 18, 2014
Nü hit single
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Nü hit single
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Use in figure of WiMAX system /low-converter
Digital upconverter (DUC) And digital low-converter (DDC) Used in the communication system extensively, in order to change the sampling rate of the signal. Become to intermediate frequency needing digital upconvertering as signal from base band, hit from frequency-dependent to base band, need, adopt digital down-conversion as signal. DUC and DDC include carrying on frequency conversion with the mixer, and the sampling rate is varied. The framework of DUC or DDC is mainly decided by required transfer ratio. As to WiMAX system, typical transfer ratio is 8- - 10 steps. As to such low transfer ratio, DUC or DDC can only adopt FIR electric-wave filter framework. If transfer ratio is very high, adopt CIC electric-wave filter. Pieces of this look over full text