Reed-Solomon ECC logic or illogic.....

From: Arash Partow (arashp_at_hotmail.com)
Date: 07/14/04

  • Next message: Arthur J. O'Dwyer: "Re: Can you find anything wrong with this solution to the Halting Problem?" 
    Date: 14 Jul 2004 04:36:11 -0700

    Hi,

    According to the RTCA's VDL mode specifications for
    reed-solomon (which btw is the same as the CCSDS),
    for messages less than NN (code length) padding of 0
    bytes has to be appiled.

    The padding is not transmitted, however at the reciever
    it is reapplied, my question is that along with the padding
    not being transmitted so to are FEC symbols not being
    transmitted.

    according to the spec depending on how many data symbols there
    are only a certain number of FEC symbols will be tranmitted,
    however at the reciever end unlike the padding that is done,
    the FECs are said to be assumed as erasure positions.

    Is it possible to give the FEC symbols as erasures?
    If so how logical would that be?

    The reed-solomon code is RS(249,255) GF(2^8) with the primitive
    polynomial:
     p(x) = 1x^8 + 1x^7 + 1x^2 + 1x^1 + 1

    and a generator polynomial:
     g(x) = 225 + 156x^1 + 176x^2 + 244x^3 + 186x^4 + 176x^5 + 0x^6
     
     
     
    Anyone with any theories? any ideas?

    Arash Partow

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  • Next message: Arthur J. O'Dwyer: "Re: Can you find anything wrong with this solution to the Halting Problem?"