Hi, I would like to downsample a signal from *390,625* Hz to *125 *Hz. *What is the best way to do this in GNURadio? *
Please find below some issues I am having with this. First, I used the Low Pass Filter block, in GNURadio, I set my Decimation to 3125, my Cutoff Freq to 125/2. But I am not sure about *the recommended value for the Transition Width parameter*? On another note, to obtain accurate results for downsampling in Matlab (and for DSP generally) it is often recommended to split the big decimation factor into a cascade of smaller ones. If I was to do the downsampling from 390625 to 125 Hz in Matlab I would do something like 5*5*5*5*5 (i.e., five separate downsamplers). *How to optimally do this in GNURadio?* By 'optimally' I mean with less computational resources given that I need to do this for multiple channels simultaneously. Finally, in another experiment for testing downsampling in GNURadio, I tried to use the Rational Resampler block with the *default settings*. However, my results were aliased. I think Low-Pass Filtering is not included in the Rational Resampler by default. *Is this right?* *How do I enable the low-pass filer? *and *what kind of filter is recommended?* Thanks in advance for your help. Best regards, Khalid
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