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pseudo random sequence

 
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cedance



Joined: 24 Oct 2003
Posts: 704
Helped: 28
Location: Germany
Post10 Oct 2004 5:28   pseudo random sequence
hi,

i have to generate a 64 bit length pseudorandom sequence. I mean to code in VHDL. Is there a necessity for knowing the polynomials that are required for genereating the sequence... or how to know from which of the register i have to tap the output??? i wanted to know this method for generating any length PN sequence. or any other way out is there? pls help me...

regards,
arunmit168.
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ljkong



Joined: 18 Jul 2002
Posts: 128
Helped: 1
Location: P.R.C
Post10 Oct 2004 12:32   Re: pseudo random sequence
there are some books which have existing circuits.
so you can use it directly.
one book named "scrambling and discrambling", maybe it is.
i am not sure. i ever read it.
this book is wrote by two Koreans.
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penghan



Joined: 20 Sep 2004
Posts: 53
Helped: 1
Location: Nanjing
Post10 Oct 2004 12:35   Re: pseudo random sequence
This is the matlab source code to generate pseudo sequence.

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echo47



Joined: 07 Apr 2002
Posts: 4205
Helped: 565
Post10 Oct 2004 13:00   pseudo random sequence
Xilinx app note 052, "Efficient Shift Registers, LFSR Counters, and Long Pseudo-Random Sequence Generators"
http://www.xilinx.com/bvdocs/appnotes/xapp052.pdf

Xilinx app note 210, "Linear Feedback Shift Registers in Virtex Devices"
http://www.xilinx.com/bvdocs/appnotes/xapp210.pdf
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