matlab mac协议之ALOHA协议，CSMA协议

matlab mac协议之ALOHA协议，CSMA协议

% 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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     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

----------- ---------  ---------- -----  ----

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