Ryan Pape wrote:
All:
I'm currently trying to extract a relatively small number of
narrowband channels out of about 10mhz. With USRP1, I can get two
channels easily by using both sets of DDCs. In some instances, I can
successfully use a filterbank, however at 12.5khz channels, I quickly
run out of horsepower if I don't keep the decimation high enough,
which does not always let me cover the swath of RF I need.
Are there any other possibilities with the new USRP2 hardware to
implement more DDCs in the firmware to do more of this work on the
USRP side? Any other thoughts in general?
You could implement more DDCs in the USRP2, but it makes more sense to
use filterbanks in software. It may take something more complicated
than a straight forward filterbank across the whole bandwidth. You
might want to do it in a few steps. For example, do a filterbank to get
you 16 channels of ~500 kHz apiece, and then do smaller filterbanks on
only those 500kHz bands have signals of interest in them.
Matt
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