Hi Andreas,
On 31-08-12 14:18, Andreas Weller wrote:
On 31.08.2012 10:01, Kristoff Bonne wrote:
With reading more about FEC systems and coding for the header of
c2-gmsk modem; I have also been thinking about other (better) FEC
systems for the voice-part of the stream.
Hi. You may use code from
http://www.cs.utoronto.ca/~radford/ldpc.software.html
Looks intersting. I need to read a bit more about it; but looks quite
promising.
If I get it correct, LDPC can be used to produce any (n,k) combination,
correct? So it can be used for both a FEC 1/2 (56/112) for a 3600 bps
modem and 2/3 (56/84) FEC for the 2400 bps modem without needing
puncturing. Correct?
However, it's there an issue that a "parity-check matrix" need to be
created first?
BTW. I also like this sentence on the wikipedia webpage about it:
"the absence of encumbering software patents has made LDPC attractive to
some.^<http://en.wikipedia.org/wiki/Low-density_parity-check_code#cite_note-3>"
^This might be exactly what we need for codec2 !!! :-)
Regards, Andreas
Chéééééééééééééério!
Kr. Bonne.
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