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From: | Johnathan Corgan |
Subject: | Re: [Discuss-gnuradio] Generating orthogonal PN sequences in GRC |
Date: | Thu, 13 Oct 2011 01:29:32 +0200 |
On Oct 12, 2011, at 15:28, godana ebrahim <address@hidden> wrote:
This block optionally takes both a seed and mask parameter. The seed provides the initial contents of the LFSR, and the mask represents the generator polynomial feedback taps. The feedback taps are the thing that creates different sequences, while the seed (as you have discovered) determines the phase of the generated sequence. The block has a set of default feedback taps for each polynomial degree, which are known to create maximal-length PN sequences:
Finally, to answer your question, in order for two different GLFSR blocks to generate orthogonal sequences, you'll have to specify your own polynomial mask. A good place to learn about maximal-length sequences with references to different polynomials:
Johnathan
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