function?vHat?=?decodeBitFlipping（rx?H?iteration）
%?Hard-decision/bit?flipping?sum?product?algorithm?LDPC?decoder
%
%??rx????????:?Received?signal?vector?（column?vector）
%??H?????????:?LDPC?matrix
%??iteration?:?Number?of?iteration
%
%??vHat??????:?Decoded?vector?（0/1）?
%
%
%?Copyright?Bagawan?S.?Nugroho?2007?
%?http://bsnugroho.googlepages.com

[M?N]?=?size（H）;

%?Prior?hard-decision
ci?=?0.5*（sign（rx‘）?+?1）;

%?Initialization
rji?=?zeros（M?N）;

%?Asscociate?the?ci?matrix?with?non-zero?elements?of?H
qij?=?H.*repmat（ci?M?1）;
?
%?Iteration
for?n?=?1:iteration
???
???fprintf（‘Iteration?:?%d\n‘?n）;
???
???%?-----?Horizontal?step?-----
???for?i?=?1:M
??????
??????%?Find?non-zeros?in?the?column
??????c1?=?find（H（i?:））;
??????
??????%?Get?the?summation?of?qij\c1（k）????????
??????for?k?=?1:length（c1）

?????????rji（i?c1（k））?=?mod（sum（qij（i?c1））?+?qij（i?c1（k））?2）;
?????????
??????end?%?for?k
??????
???end?%?for?i
???
???%?------?Vertical?step?------
???for?j?=?1:N

??????%?Find?non-zero?in?the?row
??????r1?=?find（H（:?j））;
??????
??????%?Number?of?1s?in?a?row
??????numOfOnes?=?length（find（rji（r1?j）））;
??????
??????for?k?=?1:length（r1）????????

?????????%?Update?qij?set?‘1‘?for?majority?of?1s?else?‘0‘?excluding?r1（k）
?????????if?numOfOnes?+?ci（j）?>=?length（r1）?-?numOfOnes?+?rji（r1（k）?j）
????????????qij（r1（k）?j）?=?1;
?????????else
????????????qij（r1（k）?j）?=?0;
?????????end
??????????
??????end?%?for?k
??????
??????%?Bit?decoding
??????if?numOfOnes?+?ci（j）?>=?length（r1）?-?numOfOnes
?????????vHat（j）?=?1;
??????else
?????????vHat（j）?=?0;
??????end
?????????????
???end?%?for?j
???
end?%?for?n

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件???????????0??2010-05-09?00:10??1.txt
?????文件????????1712??2010-05-21?08:29??ber.fig
?????文件???????????0??2010-05-06?20:31??BER誤碼率.txt
?????文件????????1742??2010-05-19?22:14??BER誤碼率frame=10ITER=5METHOD=1.fig
?????文件?????????136??2010-05-19?23:25??biterr的用法.txt
?????文件???????????0??2010-05-06?20:31??BITFLIP比特填充.txt
?????文件????????1621??2010-05-20?22:22??bitflip譯碼.fig
?????文件????????1697??2007-05-04?15:06??decodeBitFlip.m
?????文件????????2643??2010-05-23?14:03??decodeLogDomain.m
?????文件????????2231??2010-05-06?22:53??decodeLogDomainSimple.asv
?????文件????????2231??2010-05-06?22:54??decodeLogDomainSimple.m
?????文件????????2468??2007-05-04?15:06??decodeProbDomain.m
?????文件????????3097??2010-05-23?13:15??EbN0與SNR.txt
?????文件????????1715??2010-05-20?10:42??frame=100.fig
?????文件????????2955??2010-05-20?17:26??ldpcBER.asv
?????文件????????2929??2010-05-21?07:44??ldpcBER.m
?????文件?????????684??2010-05-10?14:52??LU分解.txt
?????文件????????1648??2010-05-20?00:32??M=100N=200frame=10ITER=5METHOD=1.fig
?????文件????????4346??2010-05-10?16:03??makeLdpc.asv
?????文件????????4521??2010-05-13?11:00??makeLdpc.m
?????文件????????4673??2010-05-21?09:47??makeParityChk.asv
?????文件????????4849??2010-05-21?15:20??makeParityChk.m
?????文件????????2885??2010-05-06?22:32??matlab學習.txt
?????文件?????????116??2010-05-20?00:41??關于打開fig文件的方法.txt
?????文件???????????0??2010-05-09?00:09??提供了3種譯碼法.txt