Re: [Discuss-gnuradio] Simulation to compute BER of a Modulator/Demodulator Encoding/Decoding system

[Christian BusquielSanz]

Good day again

First of all, thank you very much, Mr Simson
Seeing a graph working doing what I wanted to do helped me a lot on
how to solve the problem that I had with mine
I actually expected a reply in one week and I got it in a couple of
days, so it was of great help and I wanted to thank you for that

Second of all
Since I am writing long E-Mails... Should I delete the previous
E-Mails appended to this message after the signature to clean the
mailing list?
Also to free some weight from the messages

I have been working on the flowgraph these days too

I was using "Pack K bits" and I should have used "Unpack K Bits", as
you showed me,
because GMSK Demodulator demodulates each symbol providing one bit of
the result on consecutive bytes,
so I need to use only the last bits of each output to generate back the data
So that was my mistake

Since the delay that works for me is 2, I set it as a variable so I
already have the proper value when running the flowgraph
But...

A thing that I have noticed is that, when I run the flowgraph, I need
to click on the arrows of the delay,
change it and return it to the value 2,
to get the BER plotted on the QT GUI Time Sink

I have this Modulation/Demodulation flowgraph working

Now I want to add an encoder, Reed-Solomon or Convolutional Coding
One at a Time
And later on, both of them

But, as I stated earlier, I would like to ask for a way to convert
"Integer 8"/"Char" outputs from blocks into "Async Message"
to be able to use CCSDS Reed-Solomon Encoder/Decoder from "\Satellites\FEC"

I have also found another Reed-Solomonn Encoder/Decoder here:
https://github.com/gnuradio/gnuradio/tree/master/gr-fec/lib/reed-solomon
But I do not know how to install it, since I cannot find a way to
download the whole library and install it using the standard block
procedure:
https://wiki.gnuradio.org/index.php/Guided_Tutorial_GNU_Radio_in_Python#3.2.6._Installing_Python_Blocks
mkdir build
cmake ../
make
sudo make install
sudo ldconfig

If I do this downloading all the files in a separate folder, I am
getting this output when runing the command "cmake ../":
"
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"

I had compiled/installed other blocks using this method, so I do not
understand why do I need another version of CMake for this process

Thank you very much for your Time reading this message, and than you
for giving it a thought






Christian Sêngir     Busquiel Sanz





On Wed, 17 Oct 2018 at 08:52, Cinaed Simson <address@hidden> wrote:
>
> Hi Christian - start simple.
>
> First prove to yourself you can modulate/demodulate a random source.
>
> Enclosed is an example.
>
> You can replace the GLFSR source and Float To Char blocks with a Random
> Source block - but it doesn't really matter.
>
> Adjust the Delay block until the 2 curves in the Qt GUI Time Sink block
> line up,
>
> This will depend upon the speed of your machine.
>
> Then enable the 2 CRC32 blocks.
>
> You may have to adjust the delay again.
>
> Then enable the blocks to calculate BER.
>
> -- Cinaed
>
>
> On 10/14/2018 07:05 PM, Christian BusquielSanz wrote:
> > Good day
> > How are you?
> > I am a new user to GNU Radio Companion
> > I am using version 3.7.11
> > I have read, followed and finished the exercises/examples in the
> > tutorials of Working with "GNU Radio Companion"
> > (https://wiki.gnuradio.org/index.php/Guided_Tutorial_GRC) and
> > "Programming GNU Radio in Python"
> > (https://wiki.gnuradio.org/index.php/Guided_Tutorial_GNU_Radio_in_Python)
> > -------------------------
> > I have been working on designing a whole system to compute the BER of
> > different encoders using GMSK:
> > 1.- Reed Solomon
> > 2.- Convolutional Coding
> > 3.- CRC
> >
> > I have also installed GR Satellites by Daniel Estévez
> > (https://github.com/daniestevez/gr-satellites) to help me with this
> > task
> >
> > I started building the whole system using GNU Radio Companion to build
> > the blocks, but I had many problems with the input and output of
> > blocks, since there were no transformations to adapt all the blocks
> > among them, and I tried several of the blocks provided with each
> > Encoder/Decoder to make it fit
> > -------------------------
> > Once I had an idea of how it should work, I tried to start with a
> > simple system only with one of the 'encoders' which was CRC (Stream
> > CRC32)
> >
> > The Block Diagram would look like this (See attached "CRC_Test.grc" file):
> > (Random Source) => (Throttle) => (Stream to Tagged Stream) => (Stream
> > CRC32[Generate CRC]) =>A) B) C)
> > A) => (Char to Float) => (QT GUI Timer Sink)
> > B) => (GMSK Mod [S/S=10]) => (GMSK Demod [S/S=10]) => (Pack K Bits
> > [K=8]) => C) D)
> > C) 2x=> (BER) => (QT GUI Timer Sink)
> > D) => (Char to Float) => (QT GUI Timer Sink)
> >
> > And also adding noise:
> > The Block Diagram would look like this (See attached
> > "CRC_Test_with_noise.grc" file):
> > (Random Source) => (Throttle) => (Stream to Tagged Stream) => (Stream
> > CRC32[Generate CRC]) =>A) B) C)
> > (Noise Source [Gaussian]) => D)
> > A) => (Char to Float) => (QT GUI Timer Sink)
> > B) => (GMSK Mod [S/S=10]) => D)
> > C) 2x=> (BER) => (QT GUI Timer Sink)
> > D) 2x=> (Add) => (GMSK Demod [S/S=10]) => (Pack K Bits [K=8]) => C) E)
> > E) => (Char to Float) => (QT GUI Timer Sink)
> >
> > If I add another "Stream CRC32" block with [Check CRC]; I have three 
> > situations:
> > a) I add a "Stream to Tagged Stream" block before the (Stream CRC
> > [Check CRC]) with the same 'Length Tag Name' as the one after the
> > Throttle
> > b) I add a "Stream to Tagged Stream" block before the (Stream CRC
> > [Check CRC]) with a different 'Length Tag Name' as the one after the
> > Throttle and change the "Length Tag Key" of the "Stream CRC32" block
> > c) I do not add a "Stream to Tagged Stream" block before the (Stream
> > CRC [Check CRC])
> > I get these outputs:
> > a) It provides no output, and an error is shown up:
> > gr::log :FATAL: crc32_bb0 - Missing a required length tag on port 0 at item 
> > #14
> > thread[thread-per-block[16]: <block crc32_bb (14)>]: Missing length tag.
> > b) No output
> > c) It provides an output, but there is no block that removes the CRC
> > bytes, so from my point of view, the BER rate should be higher even if
> > I am using the block "Pack K Bits" with K=8, to recover the bytes
> > after the modulation (Since "GMSK Demod" returns one bit of each byte
> > in separate bytes and I need to reconstruct the signal)
> >
> > I cannot find where I am making the mistake and I would like to ask if
> > someone could point out where I am wrong so I can fix it. Thank you.
> > -------------------------
> > I tried to do also a simple test of Reed-Solomon encoding
> > But I could not match any Reed-Solomon pair of coder & decoder that
> > were paired together. Only the DVB-T one has, in the same section of
> > the Companion, both the Encoder and the Decoder
> > (If you use the magnifying glass search in the Companion, you find
> > these Reed Solomon results)
> > If you search for "Reed":
> > 1.- ATSC only has a decoder, but I do not want to use a specific
> > implementation; I want to use a general implementation for satellite
> > applications
> > 2.- ITU-T has only an encoder
> > 3.- Satellites (By Dani Estévez) has both an encoder and a decoder;
> > but its input/output is async messages, and I want to test BER, so I
> > need a random source of bits. I do not know how to convert those bits
> > into messages to use these blocks.
> > If you search for "RS":
> > 1.- ATSC shows both an Encoder as "ATSC RS Encoder" and an Decoder as
> > "ATSC Reed-Solomon Decoder" (Why do they have different titles?)
> > 2.- Satellites (By Dani Estévez) has 15 entries, but all of them use
> > messages as input/output and I have the same problem with the Random
> > Source
> >
> > So, I have not been able to build a proper block diagram and test it
> > to get any results
> >
> > I believe that the best approach would be using the FEC Enconder and
> > Decoder from Satellites (By Dani Estévez); but I do not know how to
> > use the Async Message type with the Byte output from Random Source,
> > although I have sought for examples on type conversion, but I could
> > not find any
> >
> > Could you point me in the right direction on how to assemble this graph, 
> > please?
> > -------------------------
> > Since the only implementations of Convolutional coding blocks are from
> > DVB-T and I would like to use a generic application, I have not tried
> > those yet
> > -------------------------
> > Thank you very much on all the Time you have spent in reading this
> > message and I wish you to have a nice day
> > --
> > Christian Sêngir     Busquiel Sanz
> >
> >
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > address@hidden
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> >
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio



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