Hi,
I need to (synchronously) switch the DUC/DDC frequency at certain sample
intervals.
I previously used the message ports for that and created timed commands. This
worked nicely for the RX (USRP Source) and with analog retuning.
However, it turned out that this does not work for the
Dear all,
I am currently working on IEEE802.15.4 protocol with GNU Radio and
different SDR. I am using Dr. Basti's code for testing. Its successful. But
i am having few questions to ask. I see two connections to Wireshark from
PHY layer "rxout" pin and also from pdu out of MAC layer. When i
Hi Ron,
when I adapt the parameters of my flow graph I get exactly the same
result with your file as you do.
Kind regards,
Ralf
Am 03.03.2020 um 02:22 schrieb Ron Economos:
Yes, changing back to uint16_t is correct. But something is not
correct with your file. When you read from a file,
Hi Vinicius,
you can directly feed the output of the OFDM channel estimation block
into a simple general block that you write yourself[1] – even in Python
– and make that block
* either save the contents of the relevant tags to a file or
* output a vector of (inverse) channel coefficients
Hi Federico,
I think I have sent my previous email a bit too fast.
After having looked at the code of the OFDM Synchronization block it
seems to me that this block is specific to ISDB-T. This would mean that
I cannot use it for DVB-T because of incompatibilities between ISDB-T
and DVB-T (e.g.
Hi,
> I am by no means an expert on this but just for my understanding I would be
> curious:
>
> 1.) I still do not understand why for 1 Hz at 5MSps I can get a period that's
> "500578.5" on average. The frequency error is a whopping 0.1158%!
> ((5005789.5-500)/500*100). Huge.
That's
Hi Sylvain,
Thank you very much for your answer. Much appreciated!
> Von: "Sylvain Munaut" <246...@gmail.com>
>
> Hi,
>
> > How can (or better: *should*) a fully digital signal source have phase
> > noise?
>
> Limited precision arithmetic
>
>
> > Also, for 1Hz at 5MSps I always get either
Hello.
Thank you in advance for the help...
I already searched the mailing list and could not find it how to
properly see/save the channel taps from the OFDM Channel Estimation block.
I saw that is in a tag, but how can I save it?
What I'd love to find is a way to see the channel estimation with
Hi Derek,
Thank you very much for your detailed response. I thought that tag's
insertion could be done directly from GRC. I hoped that there would be
some library to insert these tags in a stream. The truth is that I
don't have enough knowledge to write my own block.
On the other hand, I
Thank you very much, Federico.
If I understand correctly, this block replaces the OFDM symbol acquisition block. I will have a look at the examples and try it.
Best regards,
Ralf, DL5EU
Gesendet: Dienstag, 03. März 2020 um 13:05 Uhr
Von: "Federico 'Larroca' La Rocca"
An: "Ralf
Hi Ralf,
It should be right after the channel. It performs symbol acquisition, FFT
and channel equalization (as well as sampling corrections and coarse and
fine frequency corrections). Please see the examples folder in gr-isdbt
(for instance rx_demo.grc which also includes the gr-dtv blocks
Hi,
> How can (or better: *should*) a fully digital signal source have phase noise?
Limited precision arithmetic
> Also, for 1Hz at 5MSps I always get either 5005789 or 5005790 samples
> (instead of 500) ... this is fairly deterministic.
That's because the signal source works with phase
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