Error:Index in position 1 exceeds array bounds.

Code:

sum_parity=[];
llr=2;
check_node=cell(size(H,1),1);

Unrecognized function or variable 'H'.

for(i=1:size(H,1))
    for(j=1:size(H,2))
        if(H(i,j)==1)
            check_node{i}=[check_node{i} j];
        else
            ;
        end;
    end;
end;
Q=[];

for(i=1:size(H,1))
    Q=[Q llr];
end;
for(interation=1:1000)
    [ processed_llr ] = check_node_processing(Q, check_node);
    Processed_llr_in_varibale_form=cell(size(H,2),1);
    for(i=1:length(processed_llr))
        temp=processed_llr{i};
        for(j=1:size(temp,2))
            Processed_llr_in_varibale_form{round(temp(2,j))}=[Processed_llr_in_varibale_form{round(temp(2,j))} [temp(1,j);i]];
        end;
    end;
    
    
    for(i=1:length(Processed_llr_in_varibale_form))
        temp=Processed_llr_in_varibale_form{i};
        
        for(j=1:size(temp,2))
            Q(i,temp(2,j))=sum(setdiff(temp(1,:), temp(1,j)));
        end;
    end;
    for(i=1:size(Q,1))
        for(j=1:size(Q,2))
            Q(i,j)=Q(i,j)+llr(i);
        end;
    end;
    P=[ ];
    for(i=1:length(Processed_llr_in_varibale_form))
        temp=Processed_llr_in_varibale_form{i};
        P(i)=sum(temp(1,:));    
    end;
    P=P+llr;
    for(jj=1:length(P))
        if(P(jj)>=0)
            estimated_output(jj)=0;
        else
            estimated_output(jj)=1;
        end;
    end;
    parity_mat=H*estimated_output';
    sum_parity=[sum_parity sum(parity_mat) ];
    if(sum(parity_mat)==0)
        break;
        break;
    end;
    
end;

Error:

Error in ldpc_decoder (line 57)

P(i)=sum(temp(1,:));

[Torsten]

We cannot execute your code because H is undefined. But my guess is that "temp" is an empty matrix.

[Matlab Pro]

Hi @Skanda

even if H is defined - there is a call to "check_node_processing" function - which is not given.

Please supply all code needed in order to help you