Bahman
Posts:
9
Registered:
4/12/11
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Re: commBCHEncoder/commBCHDecoder
Posted:
Jul 3, 2012 2:24 AM
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"Fulus " <case28@gmail.com> wrote in message <jstf33$fjh$1@newscl01ah.mathworks.com>...
> "Spiros" wrote in message <ieo99b$lep$1@fred.mathworks.com>...
> > Hi Ethem
> > A found a solution, but the one you propose is more elegant.
> > Thanks a lot.
> > Regards Spiros
>
> Hello,
>
> I really need immediate assistance on BCH encoding and decoding for dvbs2. I have encountered similar problems as you did. could you kindly assist me here. thanks
>
> Fulus
%Dear fulus this is an example for QPSK 8/9 try it
genBCH_t8 =[1 0 0 0 1 1 1 0 0 0 0 0 0 0 1 1 1 0 0 1 0 0 1 ...
0 1 0 1 0 1 1 1 1 1 0 1 1 1 0 0 0 1 0 0 1 0 0 ...
1 1 1 1 0 0 1 0 1 1 1 1 0 1 1 1 1 0 1 0 0 0 1 ...
1 0 0 1 1 1 1 1 1 1 0 0 0 1 1 0 1 1 0 1 0 1 1 ...
1 0 1 0 1 0 0 0 0 0 1 0 0 1 1 1 1 1 0 0 1 0 1 ...
1 0 0 1 1 0 0 0 1 0 1 0 1 1];
H = dvbs2ldpc(8/9);
K_BCH=57472;
N_BCH=57600;
genBCH=genBCH_t8;
EncoderBCH = comm.BCHEncoder;
EncoderBCH.CodewordLength=N_BCH;
EncoderBCH.MessageLength=K_BCH;
EncoderBCH.PrimitivePolynomialSource='Property';
EncoderBCH.PrimitivePolynomial=de2bi(65581,'left-msb');
EncoderBCH.GeneratorPolynomialSource='Property';
EncoderBCH.GeneratorPolynomial=genBCH;
EncoderBCH.CheckGeneratorPolynomial= false;
henc = fec.ldpcenc(H);
hdec = fec.ldpcdec(H);
hdec.DecisionType = 'Hard decision';
hdec.OutputFormat = 'Information part';
hdec.NumIterations = 50;
hdec.DoParityChecks = 'Yes';
DecoderBCH = comm.BCHDecoder;
DecoderBCH.CodewordLength=N_BCH;
DecoderBCH.MessageLength=K_BCH;
DecoderBCH.PrimitivePolynomialSource='Property';
DecoderBCH.PrimitivePolynomial=de2bi(65581,'left-msb');
DecoderBCH.GeneratorPolynomialSource='Property';
DecoderBCH.GeneratorPolynomial=genBCH;
DecoderBCH.CheckGeneratorPolynomial= false;
bahman
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