%?Program?6-9
%?carriersense.m
%
%?The?function?of?the?carrier?sense
%
%?Input?arguments
%???no???????:?terminal?which?carrier?sensing
%???now_time?:?now?time
%
%?Output?argument
%???result???:?0:?idle??1:busy
%
%?Programmed?by?M.Okita
%?Checked?by?H.Harada
%

function?[result]?=?carriersense（nonow_time）

global?Mnum?Mstime?Ttime?Dtime??????????????????????????????????????????%?definition?of?the?global?variable

delay?=?Dtime?*?Ttime;??????????????????????????????????????????????????%?calculation?of?the?delay?time

idx?=?find（（Mstime+delay）<=now_time?&?now_time<=（Mstime+delay+Ttime））;??%?carrier?sense
if?length（idx）?>?0??????????????????????????????????????????????????????%?carrier?is?detected
????result?=?1;?????????????????????????????????????????????????????????%?channel?is?busy
else????????????????????????????????????????????????????????????????????%?charier?can乫t?be?detected
????result?=?0;?????????????????????????????????????????????????????????%?channel?is?idle
end

%%%%%%%%%%%%%%%%%%%%%%?end?of?file?%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1090??2011-05-14?12:44??carriersense.asv

?????文件???????1091??2001-11-29?16:19??carriersense.m

?????文件????????702??2001-11-29?16:19??distance.m

?????文件???????4320??2001-11-29?16:19??graph.m

?????文件????????872??2001-11-29?16:19??inhibitsense.m

?????文件???????6139??2008-11-05?19:46??main.m

?????文件???????2724??2001-11-29?16:19??npcsma.m

?????文件???????2199??2001-11-29?16:19??paloha.m

?????文件???????1446??2001-11-29?16:19??position.m

?????文件???????4193??2001-11-29?17:32??README-Chap6.txt

?????文件???????2398??2001-11-29?16:19??saloha.m

?????文件???????3416??2001-11-29?16:20??snpisma.m

?????文件???????1327??2011-05-09?17:21??test.dat

?????文件???????1112??2001-11-29?16:20??theorys.m

-----------?---------??----------?-----??----

????????????????33029????????????????????14