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

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] The use of scrambler/ descrambler blocks
Date: Tue, 29 Aug 2017 14:41:32 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1

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,


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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