LDPC codes BER simulation

LDPC codes BER simulation under AWGN channel, MacKay-Neal based LDPC matrix

Description

LDPC codes BER simulation under AWGN channel. MacKay-Neal based LDPC matrix. Message encoding uses sparse LU decomposition. There are 4 choices of decoder: hard-decision/bit-flip decoder, probability-domain SPA decoder, log-domain SPA decoder, and simplified log-domain SPA decoder. Documentation and update can be found at: http://sites.google.com/site/bsnugroho/ldpc

• Required Products: Communications Blockset
• MATLAB release: MATLAB 7.0.1 (R14SP1)

[Yang Xiao]

The BER results your program for short length of LDPC codes are not reliable, unbelievable, please check your program with other's published one.

[Rethnakaran Pulikkoonattu]

You may have to cross check the performance and benchmark it. If I am not mistaken, there is conflict in the results.

[nguyen khoa]

 

[michael jordan]

simply perfect

[Sabah Sewan]

God Bless You. thnx

[J J]

simple and clear, very excellent

[Shahriar Rahman]

Your Noise Calculation have some problem. The code rate is 0.5. You noise addition with signal is ok. But when you are transferring N0 to decodeLogDomain.m function that has to be N0*2.

[TEMER Elias]

Thank you for the programs .
But there some problems concerning the algorithm decodeLogDomainSimple: and specially in the calcul of the prior-likelihood (simplified).
Lci=-rx' ??
according to the algorithms
Lci= 4*rx/N0.
and about the sign -
Minus sign is used for 0/1 to -1/1.
I think that to get -1/1 mapping : Lci=2rx-1 .

[Yuhan Zhou]

Please check your codec, basically the parity check matrix is not correct, which means that H*u' is not zero vector.

[zhao long]

very good , see the proceed is dark box, the same of the source bit and the received bit is the only standard .

[liu nan]

thx

[splenjane]

thanks

[priyanka revankar]

Sir can i know the algorithm used to create the H matrix in makeLdpc.please reply its urgent for our project.thanks in advance

[venn lee]

thank you for the posting and sharing, i just read and understand the coding part,and i don't know the theory of decoding.