Bahman
Posts:
9
Registered:
4/12/11
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Re: commBCHEncoder/commBCHDecoder
Posted:
Aug 22, 2012 8:06 AM
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"Ed MrTz" wrote in message <k12c08$sbt$1@newscl01ah.mathworks.com>...
> "Bahman " <bahmanazarbad@yahoo.com> wrote in message <k0hsbu$1kd$1@newscl01ah.mathworks.com>...
> > "Fulus " <case28@gmail.com> wrote in message <k0g2j4$ar5$1@newscl01ah.mathworks.com>...
> > > > Hi dear
> > > >
> > > > is your bbframe a row vector?
> > > > because error indicates that it is a column vector,try it inverted (BBframe')
> > >
> > > Hello,
> > >
> > > yeah you right, I nverted it and it runs without errors now however, it still isnt function as it suppose to because as I go higher in Eb/No my BER isnt going lower but is actually increasing by a tiny amount. That is the Decoder is still introducing errors.
> >
> > Hi dear
> > you need to be careful about the noise you are introducing to awgn as well as noise variance you need to set in demodulator
>
> Hi Everyone!
>
> I hope that someone could help me, even.
>
> I had the sames problems with BCH and LDPC Enc/Dec to make it run......but at the end I can solved.
>
> Now, my problem is that when I use (without add a AWGN channel and modulation) encoder and decoder of BCH (in raw)......its returns 0 errors between the original msg and received/decoded msg. But its not so when I use LDPC (in raw) because I get to many errors (original msg - decoded msg).
>
> Do you know why? I attach the code that I use:
> H=dvbs2ldpc(1/4);
> enc = fec.ldpcenc(H);
>
> dec = fec.ldpcdec(H);
> dec.DecisionType = 'Hard decision';
> dec.OutputFormat = 'Information part';
> dec.NumIterations = 50;
>
> msg = randi([0 1],1,enc.NumInfoBits);
> codeword = encode(enc,msg);
>
> decodedmsg = decode(dec, codeword);
>
> % Compare with original message
> disp(['Number of bits incorrectly decoded = ' ...
> num2str(nnz(decodedmsg-msg))]);
>
> THANXXXX
DEAR WHERE IS YOUR TRANSMISSION CHANNEL??????
BAHMAN
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