Hi Marcus!
Thank you for you reply!
So I am trying to make a OFDM system with and without codification (CC
code)... for this I am using these flowgraphs (simpleOFDM.png and
CodeOFDM.png)
The problem that I saw is: If I use just codification without modulation
(just to try), the output scope is the same as the input (in this case, I
am using a square waveform).
And when I use just OFDM modulation, the output signal looks stay with a
time delay and also looks not be constant during the whole simulation (see
pics OFDMscope and OFDM2.png).
And when I use CC code + OFDM, I also have a delayed time signal and
sometimes with a lot of wrong peaks but I don't insert on the simulation
any noise signal or use some USRP to transmit and receive through the air.
(see pics OFDM+CC_1 and OFDM+CC_2.png).
after it, I am trying to transmit a CSV or TXT file with both situation
(just OFDM and OFDM+CC code) to compare the results... but as I can check
for now, the situation with OFDM+CC code get a lot of wrong information as
without code... It should be the other way, isn't it?
I hope I made it clear
Thanks!
José
2016-05-25 10:01 GMT-03:00 Marcus Müller-3 [via GnuRadio] <
ml-node+s4n60179...@n7.nabble.com>:
> Hi Jose,
>
> could you explain the problem a bit more in-depth? I'm afraid I'm not
> really understanding.
>
> By the way, if you sign up to the mailing list directly [1], you could
> directly attach the "saved to image file" (file->screen capture in GRC)
> output so that we can understand what you're doing.
>
> This time delay, why is it a problem? Is it a multiple of the number of
> symbols per OFDM symbol?
>
> Best regards,
> Marcus
>
>
> [1] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> On 25.05.2016 14:48, Jose Perez wrote:
>
> > Well, I resolved the second point... just put a Unpack K Bits after the
> File
> > Source block and then a Pack K Bits block before the File Sink block.
> >
> >
> > Someone could help me in the first question? The file that I received
> get a
> > lot of wrong information with just virtual transmittion... there is no
> noise
> > to justify this problem.
> >
> > Thank you again.
> >
> >
> >
> > --
> > View this message in context:
> http://gnuradio.4.n7.nabble.com/Doubt-with-file-sink-with-ofdm-and-CC-tp60156p60178.html
> > Sent from the GnuRadio mailing list archive at Nabble.com.
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > [hidden email] <http:///user/SendEmail.jtp?type=node&node=60179&i=0>
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> [hidden email] <http:///user/SendEmail.jtp?type=node&node=60179&i=1>
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
> ------------------------------
> If you reply to this email, your message will be added to the discussion
> below:
>
> http://gnuradio.4.n7.nabble.com/Doubt-with-file-sink-with-ofdm-and-CC-tp60156p60179.html
> To unsubscribe from Doubt with file sink with ofdm and CC, click here
> <http://gnuradio.4.n7.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=60156&code=am9zZXBlcmV6anVuaW9yQGdtYWlsLmNvbXw2MDE1NnwyMDk5MjAxODk1>
> .
> NAML
> <http://gnuradio.4.n7.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>
>
--
.: José Perez Jr
simpleOFDM (65K) <http://gnuradio.4.n7.nabble.com/attachment/60183/0/simpleOFDM>
CodeOFDM (105K) <http://gnuradio.4.n7.nabble.com/attachment/60183/1/CodeOFDM>
OFDMscope (67K) <http://gnuradio.4.n7.nabble.com/attachment/60183/2/OFDMscope>
OFDMscope2 (68K) <http://gnuradio.4.n7.nabble.com/attachment/60183/3/OFDMscope2>
OFDM+CC_1 (69K) <http://gnuradio.4.n7.nabble.com/attachment/60183/4/OFDM%2BCC_1>
OFDM+CC_2 (67K) <http://gnuradio.4.n7.nabble.com/attachment/60183/5/OFDM%2BCC_2>
--
View this message in context:
http://gnuradio.4.n7.nabble.com/Doubt-with-file-sink-with-ofdm-and-CC-tp60156p60183.html
Sent from the GnuRadio mailing list archive at Nabble.com.
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
