Re: [Discuss-gnuradio] Building simulation of basic turbo code

[AzieRis]

Anyone ?



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Re: [Discuss-gnuradio] Building simulation of basic turbo code

[Achilleas Anastasopoulos]

Hi Adrian,

in gr-trellis/examples/grc

there are two examples of a sccc and a pccc

best,
Achilleas
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Re: [Discuss-gnuradio] Building simulation of basic turbo code

[Marcus Müller]

Adrian

Don't bump your own thread within a couple of hours. Noone here is getting paid 
to react to email during the weekend within hours. Your project is complex, and 
the fact that you'll need to wait half a day or two for a qualified answer 
hopefully won't devastate your timeline.
GNU Radio is an free and open-source software project, so chances are very much 
that there's highly helpful people around, but you need to give them a chance 
to react in appropriate time.

Anyway, first questions first: you say you're new to the GNU Radio companion. 
Have you gone through the official tutorials over at 
http://tutorials.gnuradio.org ? Since your system is rather complicated and 
you'll probably need to code a block of your own sooner or later, I'd strongly 
recommend going through /all/ chapters prior to designing your overall 
application. It will help you avoid pitfalls early on!

Best regards,
Marcus

Am 12. November 2016 15:27:14 MEZ, schrieb AzieRis :
>Anyone ?
>
>
>
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>Sent from the GnuRadio mailing list archive at Nabble.com.
>
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Re: [Discuss-gnuradio] Building simulation of basic turbo code

[AzieRis]

Hello again,

sorry for that i just saw some views and hoped for a response . I totally
understand your point and hope there is gonna be someone that is more into
GnuRadio companion than me.

However since i spent some time on more research I got into stuff there:
-not sure what kind of data type i should use between coder and decoder
since i'm using byte type from random source of 0 and 1 and don't need any
modulation or noise signal between.
-does PCCC coder produce only 1 systematic output and 2 redundant ones or i
need to set that with fsm input
-should i create my own fsm file or use those from
/gr-trellis/examples/python/fsm_files
-should i use ''chunks to symbols'' block

I downloaded pccc.grc from /gr-trellis/examples/grc and trying to work with
it.

Thanks in advance,
Adrian



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Re: [Discuss-gnuradio] Building simulation of basic turbo code

[Achilleas Anastasopoulos]

Adrian,

your scattered questions indicate you have a long way to go before you can
do anything useful with gnuradio on your own.

I suggest you "study" these examples carefully: you'll discover that many
people have put a lot of time and love into this and have provided
documentation to answer most if not all your questions.
Try to read the documentation of gr-trellis explaining how you can build
any arbitrary fsm.
Then read the documentation and code for the siso modules.
Then read the documentation and code for sccc/pccc etc.
As the folder name suggests these are only EXAMPLES but this is also open
source so all the code is there for you to read/change.

If the documentation does not answer your questions then please post a
specific question on the list. Even better, provide your own grc draft
design so people can comment on something concrete.
I am willing to help you with gr-trellis if you decide to take it seriously.

best
Achilleas
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Re: [Discuss-gnuradio] Building simulation of basic turbo code

[AzieRis]

Hello again,

so i made some steps into Gnu Radio Companion by examples you suggested in
previous post. However i still could not find information or did not
understand documentation properly. I'm gonna link my project in here to let
know what am I talking about.
Turbocoding.grc
  
fsm1.fsm   
I'm not sure why am I getting errors at my PCCC encoder:
Check "(isinstance(eval(""" $o_fsm_args """[1:-1], locals(),globals()), str)
and open($o_fsm_args).close()) or True" did not evaluate.
Check "(isinstance(eval(""" $i_fsm_args """[1:-1], locals(),globals()), str)
and open($i_fsm_args).close()) or True " did not evaluate.
Also i would like to ask if pccc encoder produces 3 bits out of one - 1
systematic,1 is the output by fsm and 3rd output is the interleaved fsm
output - or each fsm produces 2 outputs so i need to use such fsm that is
not going to produce systematic output. 
The rest of the project should be right, at least if think so ;) -
turbocoding with bpsk modulation 
In later stage I'm gonna be modifying: iterations, block interleaver length,
noise value to make charts of BER performance.

Thanks in forward for every response to this post.
Regards,
Adrian




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