Re: [Discuss-gnuradio] The use of scrambler/ descrambler blocks

[Mehmet Ozcelebi]

Thanks for your kind help.

BTW, is there a proven Flowgraph that can send  qtgui_edit_box_msg or discontinous data through a channel? 

2017-08-29 18:32 GMT+03:00 Dan CaJacob <address@hidden>:

Or add fill bytes/frames, since this sounds rather like a streaming modem.

On Tue, Aug 29, 2017 at 11:17 AM Marcus Müller <address@hidden> wrote:

Then, you very likely want to pad your data with zeros; there's Tim O'Shea's gr-eventstream, which is designed for that operation!

Best regards,

Marcus

On 08/29/2017 04:34 PM, Mehmet Ozcelebi wrote:

I just want to transmit scrambled data continously, even if there is no input data.

For continous sources like "Vector source" it works fine since data flows continously.

For source like qtgui_edit_box_msg or a few characters from TCP/IP or Message Strobe,modulation occurs only if input data is present and this is not wanted. I am missing something but do't know what.

2017-08-29 15:41 GMT+03:00 Marcus Müller <address@hidden>:

Hi Mehtap,

unlike your FPGA, the GNU Radio blocks don't work data-synchronously. So, they simply won't give you any output if you don't call them with input! Maybe you could elaborate on what you mean with "got stuck"?

So, I'm not quite sure what the problem actually is, albeit I'm pretty sure your solution isn't really the solution.

Best regards,

Marcus

On 08/28/2017 09:54 PM, mehtap özkan wrote:

Some years ago I implemented a scrambler block in FPGA for a transmitter. It produced an output every clock cycle. 

Now I try the GNU Radio scrambler/descrambler blocks. They work great if the data flows continously like from a Vector source or File.

However if I have a discontinous source like a text message or a TCP/IP Source, the scrambler got stuck and has no output. In others words I need something analogous to a CLOCK for discontinous sources.

How to achieve that? Maybe XORing the discontinous source with a source of 0's produced at "sample rate"?

 Thanks for your time.

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Very Respectfully,

Dan CaJacob