Re: [USRP-users] Re: Fwd: Adding a Window block to an RFNOC graph

[Ivan Zahartchuk]

I fixed all the bugs but the result remained the same. ((

вт, 26 окт. 2021 г. в 04:14, Jonathon Pendlum <jonathon.pendlum@ettus.com>:

Hi Ivan,

Ming is correct. You need to modify this line:

- { srcblk: window0, srcport: out_0, dstblk: fft0,  dstport: in0 }

to

- { srcblk: window0, srcport: out_0, dstblk: fft0,  dstport: in_0 }

Jonathon

On Sun, Oct 24, 2021 at 4:04 PM Ming You <M.You@lboro.ac.uk> wrote:

Hi Ivan,

I think you might also check the typos, as I think for the fft0 module from Ettus should have input port name "in_0" and output port name "out_0", unless you've modified it.

Hope this helps and good luck!

Thanks,
Ming

________________________________________
From: Ivan Zahartchuk <adray0001@gmail.com>
Sent: 24 October 2021 17:40
To: Marcus D. Leech
Cc: discuss-gnuradio; usrp-users
Subject: [USRP-users] Re: Fwd: Adding a Window block to an RFNOC graph

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I read the manual. And I tried to do everything according to the instructions and existing examples. The yaml source file also uses x300_radio block

вс, 24 окт. 2021 г. в 18:17, Marcus D. Leech <patchvonbraun@gmail.com<mailto:patchvonbraun@gmail.com>>:
On 2021-10-23 5:58 p.m., Ivan Zahartchuk wrote:

I want to create FPGA firmware for USRP E310 with window function but I get the error I described above. My yaml file is also attached above. I need to do windowing and FFT on the FPGA side. And understand why FFT returns zero values even when it is configured to produce complex data.

[image.png]

пт, 22 окт. 2021 г. в 17:55, Marcus D. Leech <patchvonbraun@gmail.com<mailto:patchvonbraun@gmail.com>>:
On 2021-10-22 6:05 a.m., Ivan Zahartchuk wrote:

Yes I am setting fft for magnitudes. On the front side, I am doing a log. I perfectly understand where infinity comes from. I don’t understand why the FFT returns 0. But how can I configure the Window?

What does uhd_usrp_probe show in the "RFNOC Blocks" section on this device?

I think the window RFNOC function in GNu Radio takes a list of the window values as a parameter--you can populate that with any of the window.* functions
  within Gnu Radio.


пт, 22 окт. 2021 г. в 01:51, Marcus D. Leech <patchvonbraun@gmail.com<mailto:patchvonbraun@gmail.com>>:
On 2021-10-21 6:40 p.m., Ivan Zahartchuk wrote:


Hello, I have a problem that when receiving samples from the USRP E310 board, after the FFT block at low gain, zero values are received. After that I log them and get infinity. I wanted to figure out what the problem is, but I have no idea, maybe the Window block will fix the situation. But when building my yaml file, I get the error:
[ERR] 2 Unresolved connection(s)
[ERR]     (window0-out_0 -> fft0-in0)
[ERR]     (fft0-out_0 -> ep1-in_0)
[INF]         (('radio0', 'ctrl_port', 'master'),)
[INF]         (('radio0', 'time_keeper', 'listener'),)
[INF]         (('radio0', 'x300_radio', 'slave'),)
[INF]         (('_device_', 'ctrlport_radio', 'slave'),)
[INF]         (('_device_', 'time_keeper', 'broadcaster'),)
[INF]         (('_device_', 'x300_radio', 'master'),)
Please tell me what could be the problem and how can I add the Window block to my image?





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Do you have your FFT configured for log output?  Because the logarithm of zero is undefined.


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I noticed looking at your .yaml file that it references x300_radio blocks, and since this is an E310, that may not be appropriate?  I know that there have
  historically been considerable differences between the X300 RFNOC radio blocks and those for E310.

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