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

[Philip Levis]

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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