Hi,,how do I execute the do loop in matlab.I am explaining the problem below.

I have a command.I want to execute it until the condition becomes false.How do I do that?

noise=(rand(1,length(H))<.3)*3 ; %%%channel model %%I am taking 3 as erasure bit

for i=1:1:length(noise)

      if noise(i)==3
          Codeword(i)=3;
      else Codeword;
      end
  end

Codeword;   %%%%%codeword with noise after passing through the channel

a=sum(Codeword==3)

H_dummy=zeros(size(H,1),size(H,2));

for i=1:1:size(H,1)

      for j=1:1:size(H,2)

          if Codeword(j)==3

              if H(i,j)==1;
                  H_dummy(i,j)=3;   
              else H_dummy;
              end
          end
      end
  end

H_dummy ; %%%only erasures are kept for weight calculation

for i=1:1:size(H,1)

      for j=1:1:size(H,2)         %%%column

          if Codeword(j)~=3

              if H(i,j)==1
                  H(i,j)=Codeword(j);
              end
          end
      end
  end

for i=1:1:size(H,1)
    for j=1:1:size(H,2)

          if Codeword(j)==3
              if H(i,j)==1
                  H(i,j)=0;  %%%%eliminating nodes
              end
          end
      end
  end
  H;

Check_node=mod(sum(H,2),2);

for i=1:1:size(H_dummy,1)
 weight=sum(H_dummy(i,:)==3); %%%%this matrix is used to check weight row-wise (actually check nodes with degree one)

        for j=1:1:size(H_dummy,2)
            if weight==1
                if H_dummy(i,j)==3;
                 Codeword(j)=Check_node(i);

           end
           end
     end
  end

This is my decoder for LDPC code.How do I iterate the same program several times so that I can recover more number of erasures.

Thanks in Advance

Answer 1

[秋月]

Do you have the LDPC simulation code over BEC channle . If you have ,can you give me your code to learn? Thank you in advance.