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Decoding Message in Matlab with soft decision

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Jimmy cho
Jimmy cho 10 Oct 2020
댓글: Jimmy cho 11 Oct 2020
Hi guys,
i'm trying to encode and decode a simple message using Matlab , Im trying to implement in matlab viterbi decoder with k=7 , r=1/2 .
so I coded message which it's [0 0 1] in the encoder k=7 , r=1/2 . so the output of the encoder I entered it to my viterbi decoder that I decoded but the decoded
message isn't the same as input message , it means the decoded message should be the same as [0 0 1].
my code in matlab is:
msg=[1 1 0]; %input
constlen = 7;
codegen = [171, 133]; % G1=171 , G2=133. this is parameters for k=7 , r=1/2 .
trellis = poly2trellis(constlen, codegen);
coded=convenc(msg,trellis);
ViterbiDecoderMsg=vitdec(coded, trellis, length(msg),'cont','soft',1);
the output (decoded message) isn't the same input message, it means that my viterbi decoder isn't properly working and I get wrong decoded message.
Note: the output of the encoder is two bits (a0, a1).
any help please how do I update/fix my code in order to get correct decoded message as the input message?

  댓글 수: 2

Jimmy cho
Jimmy cho 10 Oct 2020
could you please at your free time help me here in this thread? Im stuck about two weeks on this problem to implement /use soft viterbi decoder of matlab.
Appreciated !
Jimmy cho
Jimmy cho 11 Oct 2020
Any help please?

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