%This?code?is?to?generate?parity?check?matrix?of?LDPC?code?using?Gallager‘s?construction.
%Date:?November?23?2013.

clc
close?all
clear?all

n?=?24;?%?Number?of?columns
w_c?=?3;?%?Column?weight
w_r?=?6;?%?Row?weight
k?=?n*w_c/w_r;?%?Number?of?rows

H_sub?=?zeros（n/w_rn）;?%?First?sub-matrix;?there?are?w_c?such?sub-matrices.

%%?Generation?of?Basic?Sub-matrix
for?i?=?1:n/w_r
for?j?=?（i-1）*w_r+1:i*w_r
H_sub（ij）?=?H_sub（ij）?+?1;
end
end
%%?Permutation?of?Basic?Sub-matrix
H_pre?=?H_sub;
for?t?=?2:w_c
x?=?randperm（n）;
H_sub_perm?=?H_sub（:x）;
H_pre?=?[H_pre?H_sub_perm];
end

H?=?zeros（kn）;
for?p?=?1:w_c
?
H（（p-1）*（n/w_r）+1:（p）*（n/w_r）1:n）?=?H（（p-1）*（n/w_r）+1:（p）*（n/w_r）1:n）?+?H_pre（:（p-1）*n+1:p*n）;
end

%?H?is?the?requires?parity?chack?matrix.

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件?????????791??2013-11-23?13:13??Gallager_construction_LDPC.m
?????文件????????1306??2014-02-12?14:39??license.txt