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Topic: commBCHEncoder/commBCHDecoder
Replies: 34   Last Post: Apr 19, 2014 3:48 PM

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Bahman

Posts: 9
Registered: 4/12/11
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


Date Subject Author
12/18/10
Read commBCHEncoder/commBCHDecoder
Spiros
12/20/10
Read Re: commBCHEncoder/commBCHDecoder
Ethem
12/20/10
Read Re: commBCHEncoder/commBCHDecoder
Spiros
3/2/11
Read Re: commBCHEncoder/commBCHDecoder
Adam
3/4/11
Read Re: commBCHEncoder/commBCHDecoder
Spiros
4/12/11
Read Re: commBCHEncoder/commBCHDecoder
Bahman
4/15/11
Read Re: commBCHEncoder/commBCHDecoder
Spiros
6/2/11
Read Re: commBCHEncoder/commBCHDecoder
allice
5/22/11
Read Re: commBCHEncoder/commBCHDecoder
Ratty
4/12/11
Read Re: commBCHEncoder/commBCHDecoder
Bahman
6/23/12
Read Re: commBCHEncoder/commBCHDecoder
Fulus
6/23/12
Read Re: commBCHEncoder/commBCHDecoder
Fulus
6/24/12
Read Re: commBCHEncoder/commBCHDecoder
Bahman
6/25/12
Read Re: commBCHEncoder/commBCHDecoder
Fulus
7/2/12
Read Re: commBCHEncoder/commBCHDecoder
Fulus
7/3/12
Read Re: commBCHEncoder/commBCHDecoder
Bahman
7/15/12
Read Re: commBCHEncoder/commBCHDecoder
Fulus
7/16/12
Read Re: commBCHEncoder/commBCHDecoder
Bahman
7/16/12
Read Re: commBCHEncoder/commBCHDecoder
Fulus
7/17/12
Read Re: commBCHEncoder/commBCHDecoder
Bahman
8/14/12
Read Re: commBCHEncoder/commBCHDecoder
Fulus
8/14/12
Read Re: commBCHEncoder/commBCHDecoder
Bahman
8/15/12
Read Re: commBCHEncoder/commBCHDecoder
Fulus
8/16/12
Read Re: commBCHEncoder/commBCHDecoder
Bahman
8/22/12
Read Re: commBCHEncoder/commBCHDecoder
Ed MrTz
8/22/12
Read Re: commBCHEncoder/commBCHDecoder
Bahman
8/22/12
Read Re: commBCHEncoder/commBCHDecoder
Ethem Sozer
8/25/12
Read Re: commBCHEncoder/commBCHDecoder
Ed MrTz
12/29/12
Read Re: commBCHEncoder/commBCHDecoder
Ed MrTz
5/14/11
Read Re: commBCHEncoder/commBCHDecoder
Akilan
6/28/11
Read Re: commBCHEncoder/commBCHDecoder
Leonardo O. Iheme
7/4/11
Read Re: commBCHEncoder/commBCHDecoder
Leonardo O. Iheme
12/7/11
Read Re: commBCHEncoder/commBCHDecoder
Brian
12/7/11
Read Re: commBCHEncoder/commBCHDecoder
Brian
4/19/14
Read Re: commBCHEncoder/commBCHDecoder
ibrahemsami100@gmail.com

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