qcc4.m

ldpc码中

function c4=qcc4(H)
%c4=qcc4(H)
%如果包含有4环，则c4=1，否则c4=0

[rows cols]=size(H);

doubleH=double(H);

M=doubleH*doubleH';

t=find(M>1);

len=length(t);

cnt=len-rows;

c4=cnt>0;