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Re: [Discuss-gnuradio] Using Scrambler

From: Daniel Batista
Subject: Re: [Discuss-gnuradio] Using Scrambler
Date: Fri, 16 Jan 2015 12:20:46 +0000 (UTC)

Hi again, a question on the same subject.

Gnuradio has 2 blocks for scrambling "Scrambler" and "Additive Scrambler" but only one block for descrambling.
I suppose the "Descrambler" grc block corresponds to the "Scrambler" block.
How can I descramble messages that are scrambled with the "Additive Scrambler" block?
Do I have to write my own block?

Thank you

On Tuesday, December 23, 2014 11:48 AM, Daniel Batista <address@hidden> wrote:

I want to use the scrambling polynomial: 1 + X^12 + X^17. This means the currently transmitted bit is the EXOR of the current data bit, plus the bits that were transmitted 12 and 17 bits earlier.
But I'm not sure what are the suitable values for Mask and Seed for the gnuradio Scramble Block.
Any help will be appreciated.


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