[WM]: on Viterbi Decoder

["Z. W. Gao" <gaozhengwei@gmail.com>]

hi,all,
I am recently working on this paper:

Matt L. Miller,Gwennael J.Doerr,Ingemar J. Cox, Applying Informed coding an= d embedding to design a robust,high capacity watermark,
IEEE Trans.IP,2004

And I have tried to implement Viterbi Decoding algorithm myself,but the decoder had a high BER. I still havent figured out what was
wrong there.
Perhaps how to choose the " randomly-genereated,length N reference vector
"s(N=12) may concerns.But i am not sure.I tried to use Gram-Schmidt proce= ss to orthogonalize these reference vectors,and somehow
the results improved.

Is there some matlab code for the Viterbi Decoder?Any advice will be appreciate.

Thanks for advance!

Z.W. Gao

--
Gao Zhengwei
College of Computer Science,ZheJiang University gaozhengwei@google.com


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