Is there an optimum hardware decimation to maximize receiver dynamic range?
For example, if I have an X310 at 200 Msps with 14 bit ADC receiving a low frequency tone (LFRX board), those samples are truncated to 16 bits prior to Ethernet. If I'm decimating by 800 (from 200 Msps to 250 ksps) in the hardware, then I have gained an ~5 additional bits for a total of 19 ENOB. Thus I lose 3 bits from the truncation. If I hardware decimate by 16 (from 200 Msps to 12.5 Msps) then I have gained just 2 bits for a total of 16 ENOB. I could then decimate to 250 ksps in GR where it's floating point, and possibly preserve the full 19 ENOB. Am I thinking this out correctly, or is it not worth the trouble? I assume the 32-bit floating point decimation in GR will have the range to preserve 19 ENOB? Thanks, Lou -- View this message in context: http://gnuradio.4.n7.nabble.com/Optimum-decimation-for-maximizing-dynamic-range-tp54831.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
