[Tinyos-host-mote-wg] Re: [Tinyos-2.0wg] RandomC vs RandomLfsrC

[Joe Polastre]

I think using MLCG to reseed LFSR is a good idea.  I vote for that one.

-Joe

On 6/7/05, Philip Levis <pal at eecs.berkeley.edu> wrote:
> On Jun 6, 2005, at 10:35 AM, Joe Polastre wrote:
> 
> > Because of the high timing restrictions (ACKs must occur at a given
> > offset from the message, messages must be transmitted on symbol
> > boundaries), I want to stick with LFSR  for CC2420.
> >
> 
> What are the exact timing requirements? Do you know if MLCG is too
> long? We can count the cycles or test empirically to see if it is.
>  From a protocol standpoint, the fact that it actually generates a
> good random sequence can make a big difference. At the very least,
> LFSR should reseed with MLCG (perhaps in a task, to remove the timing
> issue). We need to run statistical randomness tests to see if this
> behaves well.
> 
> Phil
> 
> -------
> 
> "We shall not cease from exploration
> And the end of all our exploring
> Will be to arrive where we started
> And know the place for the first time."
> 
> - T. S. Eliot,  'Little Gidding'
> 
>

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