Re: [Discuss-gnuradio] Regarding correlate access code-tag block

[Cinaed Simson]

As you may have already discovered, I was wrong about unpacking bits for
fec.

Actually, I have no idea on how I'm getting the results I'm getting
using my modifications of your flowgraph - those depreciated blocks
definitely have strange problems. If I insert the unpack k=8 block as
required for fec the flowgraph doesn't work.

I ran into a problem testing fec - I modified your sources and I didn't
have enough frame bits. So I set the frame bits to exactly what I need.

And I can't get a simple correlation access tagged test working - even
with a tag gate. The only way it works is if remove the access code -
which defeats the purpose.

So I'm go to have to evolve and get the protocol formatter working.

Also, you don't have to use the rx and tx packet blocks - you can use
the replacements for the PSK mod/demod blocks - the constellation
mod/demod blocks - you probably shouldn't use any depreciated blocks.

-- Cinaed


On 1/10/19 10:01 PM, Maitry Raval wrote:
> Hello,
> 
> Ok, One more query, what is the purpose of the block unpack k=1 bit at output 
> of PSK demod block, because the meaning of unpack k=1 means byte to byte 
> conversion, right?
> 
> With Best Regards,
> Maitry Raval,
> 
> ----- Original Message -----
> From: "Cinaed Simson" <address@hidden>
> To: "Maitry Raval" <address@hidden>
> Cc: "discuss-gnuradio" <address@hidden>
> Sent: Friday, January 11, 2019 2:11:54 AM
> Subject: Re: [Discuss-gnuradio] Regarding correlate access code-tag block
> 
> On 1/10/19 2:47 AM, Maitry Raval wrote:
>> Hello,
>>
>> Thanks for your time!
>>
>> It works completely fine, now I understand that we have to give tagged 
>> stream at the input of encoder.
> 
> Sorry, I didn't mean to imply you needed the stream to tagged stream
> block to make it work.
> 
> I just put in at the beginning so I could use the tag debug as a brute
> force search to find out what was blocking the flow.
> 
> There are two sequential tag blocks - the correlate correlate access
> code-tag from gnuradio and a block from gr-satellites - I would guess
> that is all you need.
> 
> Select "pass thru" on the stream to tagged stream block - it should
> still work.
> 
> -- Cinaed
> 
> 
>>
>>
>> With Best Regards,
>> Maitry Raval,
>> R& D engineer|Azista Industries Pvt Ltd| 079-40605800|www.azistaaerospace.com
>>
>> ----- Original Message -----
>> From: "Cinaed Simson" <address@hidden>
>> To: "discuss-gnuradio" <address@hidden>
>> Cc: "Maitry Raval" <address@hidden>
>> Sent: Thursday, January 10, 2019 1:21:34 PM
>> Subject: Re: [Discuss-gnuradio] Regarding correlate access code-tag block
>>
>> Hi Mailry - I was able to get it run.
>>
>> I used the "correlate access" block from gnuradio - my installation of
>> gnuradio didn't like the block in your flowgraph.
>>
>> And then I had to install the python module "construct" in order to get
>> the flowgraph to run.
>>
>> In order to get the flowchart to work - at least in the sense of filling
>> up the output.txt file - I added a "Stream to Tagged Stream" block and
>> define a consist tag to get the Tag Debug block to work.
>>
>> Also, I had to remove the "unpack" block before the PSK modulation,
>> added a "Unpack K=1" block just after the PSK demodulation - and I set
>> "Generate Options" to "No Gui" in the Options block.
>>
>> -- Cinaed
>>
>>
>>
>> On 1/8/19 12:40 AM, Maitry Raval wrote:
>>> Hello, 
>>> thanks for your guidance.
>>> I have also attached the grc file, input/output files and python file for 
>>> your reference. after adding tag debug, still didn't get any output. I have 
>>> also tried this same in ubuntu 18.04 with GNU radio 3.7.11 version.
>>> actually because these psk blocks are deprecated, I have tried it with dpsk 
>>> mod, demod block. But as I wanted to do continuous transmission, I didn't 
>>> find replaced block for correlate access code-tag block, and the cusom 
>>> block from gr-satellites are for extracting syncbits. 
>>> I have also tried with simple flow graph by just sream muxing 2 files one 
>>> with sync bits and other one is payload file and give that output to 
>>> correlate access code-tag block, but that also didn't work.
>>>
>>> It would be grateful, If you guide me on this. I just want to make that 
>>> sync bits searching and extracting from payload and receive only payload at 
>>> the output. 
>>>
>>>
>>> With Best Regards,
>>> Maitry Raval,
>>>
>>>
>>> ----- Original Message -----
>>> From: "Cinaed Simson" <address@hidden>
>>> To: "discuss-gnuradio" <address@hidden>
>>> Sent: Tuesday, January 8, 2019 1:47:56 PM
>>> Subject: Re: [Discuss-gnuradio] Regarding correlate access code-tag block
>>>
>>> I broke down and looked at the image.
>>>
>>> Note, PSK Demod, Correlate Access Code - Tag, Packet Encoder, and Packet
>>> Decoder have been depreciated.
>>>
>>> And they're usually depreciated because they have problems - and they
>>> are usually replaced with different blocks which work better and are
>>> typically more general.
>>>
>>> The tutorials are good place to start looking for the replacements.
>>>
>>> -- Cinaed
>>>
>>>
>>> On 1/7/19 11:22 PM, Thomas Lavarenne wrote:
>>>> Oh, it is "File Sink" not "Tagged file sink", didn't see sorry.
>>>>
>>>> Le mar. 8 janv. 2019 à 08:20, Thomas Lavarenne
>>>> <address@hidden <mailto:address@hidden>> a écrit :
>>>>
>>>>
>>>>
>>>>     Hi,
>>>>
>>>>         But, the issue is that correlate access code-tag block is not
>>>>         working and producing tags, so that my output file will come
>>>>         blank. as  I am certain that at the output of FEC extended
>>>>         decoder, both the sync bits and payload is available which I
>>>>         have seen by attaching file sink at the output of FEC extended
>>>>         decoder.
>>>>
>>>>
>>>>     There is a block "Tag Debug" to see if the tag is generated behind
>>>>     "correlate access code - tag block".
>>>>
>>>>     On the other hand, the documentation of "Tagged File sink" indicate
>>>>     that the block need the keyword "burst" (with value: True) to
>>>>     trigger the saving of the data.
>>>>
>>>>     Best regards,
>>>>
>>>>     Thomas
>>>>
>>>>     _______________________________________________
>>>>
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>>>>
>>>>
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>>>
>>>
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>> .
>>
>

my-fec-tags-test.grc
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