On 09/22/2015 06:07 PM, Simon Olvhammar wrote:
Hello,
I have a question regarding RFnoc and the USRP x310 FPGA capabilities.
We currently have a working GnuRadio application used for astronomy
observations and are looking to get several more devices for
integration in other systems.
However the data rates are high and CPU loads as well, thus we would
like to move the application to the FPGA.
In the GnuRadio application we basically take the FFT of the signal
and store it to files.
In Python we average the stored FFT:s, in terms of file size this is
then reducing, for example a 200 MB file with FFT:s to a couple of KB.
We would like to do the latter in the FPGA using RFNoc. This would
then eliminate the need for expensive PCIe and Ethernet equipment for
the high data rates.
My question is, is this possible using current RFnoc blocks?, with for
example an average block?
Also wondering if a 8k channel FFT block might be expected in RFNoc
anytime soon?
Best regards
Simon
Apart from the larger FFT, this should be doable--there's
complex-to-mag, and single-pole-IIR filter modules in RFNoC, along with
decimation blocks, so you could do your FFT averaging in the FPGA,
and "dribble" out at much lower rates, compared to the incoming
sample rates--I assume that you want to use the widest bandwidth
possible?
I also want to use RFNoC for radio astronomy applications--but haven't
had time to pursue it yet. Both for simple interferometry, and
single-dish total-power measurements.
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