decode_ldpc_matlab.m

The files include LDPC that using different approach to finish its decoding.And the approach is par

function [vhat,iteration]=decode_ldpc_matlab(rx_waveform,No,h,rows,cols,ind,r,c,max_iter)

% bit to check
% check to bit
% update APP LLR
% hard decision
% if valid codework, then exit

vhat(1,1:cols)=0;   %length of decoded word = number of colums of H

s=struct('a',sparse(rows,cols,0),'b',sparse(rows,cols,0),'g',sparse(rows,cols,0));
% a:check to bit messages of previous iteration, b: current check to bit messages,
% g:updated codebit APP LLR

gamma_n=(4/No)*rx_waveform; %LLR=2*y/variance ; y=rx_waveform

s.g(ind)=gamma_n(c);        %LLR