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How to use the built-in Matlab tools for LDPC encoding and decoding?

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urwelcome

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in matlab there is a fuction used as LDPC encoder .

enc = fec.ldpcenc; % Construct a default LDPC encoder object



and a decoder


decodedmsg = decode(dec, llr);


which takes LLR values from


llr = demodulate(demodObj, receivedsig);


but this "demodulate" function calculates the LLRs for Gaussian channel, I want to use the same encoder and decoder for Rayleigh fading channel, I need your help that what shoud be changed so that I can use the built in matlab tools for LDPC encoding and decoding.


I need your advice, hope somebody will reply..
 

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