LDPC decoder hard decision not producing expected result

Wen Pang

2016 11 24

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FYP2trial.mdl

Good day everyone, I'm currently running a project to investigate the performance of LDPC error correction technique in WSN. However, after I drew the blocks in simulink, the LDPC decoder is not producing expected result when i monitor the BER. I had troubleshoot this problem for a few weeks yet i still couldn't solve it. Can anyone please kindly help me? I'm really in a hot soup right now.

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Walter Roberson 2016-11-24

There must be something wrong with your model. The higher the error rate in your BSC, the higher the error rate on the uncorrected channel [error display further to the right] (which is as expected), but the lower the error rate after correction [error display further to the left]. Error rate with probability 0 in BSC is about 91% when it should come out as 0.

Is it possible this has to do with the number of samples of delay in the comparison?

Wen Pang 2016-11-25

Thanks for the reply. That is the main problem that is bothering me right now. When I connect a simout to show the output of the corrected part, it was something totally different from the input. i think that is the main reason why it showed such high of error rate. I am running out of idea on how to correct it. Do you have any idea on how to solve it? Your effort is much appreciated.

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