Re: [pilc] Re: How many bytes should a CRC-32 protect?

From: Matt Mathis (mathis@psc.edu)
Date: Tue May 07 2002 - 13:48:18 EDT

  • Next message: Dan Grossman: "[pilc] Re: How many bytes should a CRC-32 protect?"

    On Tue, 7 May 2002, Aaron Falk wrote:
    > You're assuming a uniform distribution of errors, aren't you? If you have
    > bursty errors (as in most wireless channels), you win with bigger packets
    > since errors are concentrated in a smaller number of packets.

    Well yes, perhaps. Actually I think it depends on a whole bunch of assumptions
    about error distribution, and different terms can oposite effects.

    The "hidden" model I used is that all raw errors cause the CRC to be uniformly
    distributed actross 4e+9 values, one of which will cause a "false pass".

    Thanks,
    --MM--
    ----------------------------------------------
    Matt Mathis <mathis@psc.edu> W:412.268.3319
    http://www.psc.edu/~mathis H:412.654.7529
    ----------------------------------------------

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