Bahman
Posts:
9
Registered:
4/12/11
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Re: commBCHEncoder/commBCHDecoder
Posted:
Jun 24, 2012 5:27 AM
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"Fulus " <case28@gmail.com> wrote in message <js5k8f$gem$1@newscl01ah.mathworks.com>...
> hi,
>
> plus i keep getting this error telling me my codeword length cant exceed 255...
>
> ??? Error using ==> fec.bchbase.setN at 20
> N must equal 2^m-1 for some integer m between 3 and 8.
>
> How can I achieve larger block lengths up to dvbs2 standards
>
> "Fulus " <case28@gmail.com> wrote in message <js5dkl$kim$1@newscl01ah.mathworks.com>...
> > "Spiros" wrote in message <ieo99b$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 please i'm facing same problems here. could u help me out. fuluskaze@yahoo.com
Dear Fulus
You need to make such intialization
You need to define parameters for each modcod according to etsi standard
%-----DVB-S2---INITIALIZATION.......an example
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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