computeldpclists.m

matlab最新LDPC源码,不太好懂.请各位高手指点迷津~

function computeldpclists(h, H)
%COMPUTELDPCLISTS  Compute check node lists for LDPC base object.

% H: Parity check matrix.

%   Copyright 1996-2005 The MathWorks, Inc.
%   $Revision: 1.1.6.1 $  $Date: 2005/12/12 23:12:51 $

check = nonzeros(H);
if ~isempty(check(check ~= 1))
    error('Not a zero-one matrix.');
end
[i, j] = find(H);
j = [full(sum(H)) -1];
if ~isempty(find(j==0))
    error('Cannot have an empty column.');
end
x = find(j(2:end)-j(1:end-1));
y = j(x);

h.rlist = int32(i-1);
h.dlist = reshape([filter([1 -1],1,x);y],1,[]);