LDPC Decoder source code

[m_llaa]

ldpc source code

Hi
I have a urgent need to LDPC decoder source code for SPA(Sum Product) or BP(Belif Propagation) algorithm.
I wrote 1 in matlab but its result doesnt match to some famous papers.
thanks

m_llaa@yahoo.com

 

[holyshoot]

Did you try google search?
Here is a link (looks to be something that you wanted)
https://arun-10.tripod.com/ldpc/ldpc.htm
https://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=8977&objectType=File
Cheers.

 

[m_llaa]

Thanks
I think that link to mathwork is useful
I will test it

 

[m_llaa]

Hi to every one
I tested it. I compare my resualts by results in
"Low-Density Parity-Check Codes Based on Finite Geometries: A Rediscovery and New Results" by Shu Lin and Fossorier and Yu Khu
I simulate (255,175) EG LDPC. my BER in 1 dB and 2dB is the same to that paper but the difference in 3dB is large. (see attachment)

Please help me to simulate some LDPC code.
Regards
M.Lari

 

[holyshoot]

3dB - you might be forgetting the factor of "2" in the noise variance calculation.

 

[m_llaa]

Hi
No, I dont forget power 2.
also the difference is more than 3 dB, it is about 8 dB

 

[samuraign]

Hi to every one
I tested it. I compare my resualts by results in
"Low-Density Parity-Check Codes Based on Finite Geometries: A Rediscovery and New Results" by Shu Lin and Fossorier and Yu Khu
I simulate (255,175) EG LDPC. my BER in 1 dB and 2dB is the same to that paper but the difference in 3dB is large. (see attachment)

Please help me to simulate some LDPC code.
Regards
M.Lari

Hi ,
Is it a textbook or paper.
Can you post it here.
Do u have the code for it.