On 14/08/2024 02:57, Olo via USRP-users wrote:
Dear Ettus Support,
Thank you for your prompt and detailed response. I appreciate the
clarification regarding the use of RFNoC and UHD multi_usrpstreamers.
To answer your question, my goal is to display the Power Spectral
Density (PSD) from the four channels. I plan to use a window function,
perform an FFT, and apply the log power block to calculate the PSD.
Could you please advise on the best way to combine all four channels
into one for this purpose? Specifically, I'm interested in
understanding how to properly aggregate the data streams so that I can
calculate the PSD effectively.
Thank you again for your support.
Best regards,
Olo
That's probably a question for the discuss-gnuradio mailing list,
assuming you're using GNu Radio.
UHD isn't a signal-processing framework -- it's a driver interface to
the hardware. RFNoC augments this with
DSP blocks that can run on the hardware. I don't *think* that
there's enough resources on the X310 FPGA to run
FFTs on all 4 channels, but I could be wrong. Maybe there's someone
on here who has done this with RFNoC.
In terms of "spectral merging". If all 4 channels share a common phase
reference, then I *think* that you can
rotate-and-add prior to computing a single FFT over the aggregated
stream. But that's, again, a DSP question, and
the discuss-gnuradio mailing list might be a better venue for that
type of question.
On Tuesday, August 13th, 2024 at 16:48, Marcus D. Leech
<patchvonbr...@gmail.com> wrote:
On 13/08/2024 10:36, Olo via USRP-users wrote:
Dear Ettus Support Team,
I hope this message finds you well.
I am currently working with an X310 SDR equipped with two TwinRX
daughterboards, and I am looking to receive data simultaneously
across all four channels. My goal is to maximize the available
bandwidth by configuring the system to receive on all channels in
parallel.
Could you please advise on the best approach to achieve this?
Specifically, I would like to know if it is necessary to use a
specialized RFNoC graph for this setup, or if the uhd::multi_usrp
class in the UHD library, along with a corresponding rx_streamer,
would be sufficient to accomplish this task.
I appreciate any guidance or recommendations you can provide.
Thank you for your support.
Best regards,
Olo.
Assuming that all the streams terminate on your computer, then the
limiting factor is always going to be your computer. RFNoC
is only helpful if you want to do some of the computing on the radio.
But if the goal is to have 4 streams going to your computer,
at full rate, then RFNoC doesn't bring anything to the table--and in
fact, internally these days, an application that uses UHD
multi-usrp streamers actually sets up a standardized RFNoC flow on
the radio anyway.
This document can be helpful:
https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks
The ultimate question becomes "what do I want to do with those
streams?". That will determine whether your computer
can handle the aggregate data rates.
_______________________________________________
USRP-users mailing list --usrp-users@lists.ettus.com
To unsubscribe send an email tousrp-users-le...@lists.ettus.com
_______________________________________________
USRP-users mailing list -- usrp-users@lists.ettus.com
To unsubscribe send an email to usrp-users-le...@lists.ettus.com
