An updated decoder: v0.4c

 http://abelian.org/ebnaut/win32/ebnaut-rx.exe
 http://abelian.org/ebnaut/win64/ebnaut-rx.exe

fixes a few minor bugs and has a small improvement which can
significantly reduce the time taken for a full phase search
especially when using longer list lengths.  No changes to
improve decode probability.

A note about CRC size and decoder list length -

The list length to used depends on the CRC size.  For a CRC
of size C bits you should use a list length of 2 to the power
of C-1 or thereabouts.

For example 32768 for a 16 bit CRC, or 128 for an 8
bit CRC.    The value is not very critical so you can
round it to a sensible number such as 30k.   In fact you
can halve this recommended length and only lose about 1% or
so decode success rate.

It doesn't harm decode performance if you use a longer list
but it doesn't increase the probability of successful decode
and the decoder takes longer to run.

The default setting of CRC-16 and 20k list length is turning
out to be reasonable but I'm not yet able to say what is the
best CRC size to use in any situation.

--
Paul Nicholson
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