test.m

来自「MATSNL is a package of MATLAB M-files fo」· M 代码 · 共 66 行

clear;
for h=1:10
platform.max_backoff_num=2*h;
platform.ch_idle_prob=0.3;
for u=1:20000
% Probability of Idle channel upon clear channel accessement

platform.ch_busy_prob=1-platform.ch_idle_prob;
% Maximum number of random backoff for channel busy

% Unit time for random backoff
platform.unit_backoff=1*(10^-3); % (1) msec



Coff=0;
% for k=1:platform.max_backoff_num
% Coff=Coff+(2*platform.ch_busy_prob)^(k)-platform.ch_busy_prob^(k);
% % Coff=Coff+(2*platform.ch_busy_prob)^(k);
% end
% platform.avg_listen_delay=platform.unit_backoff*(Coff*(1-platform.ch_busy_prob)/platform.ch_busy_prob);
% platform.avg_listen_delay=platform.avg_listen_delay+(1+platform.ch_busy_prob^platform.max_backoff_num);
A=2*(1-(2*platform.ch_busy_prob)^platform.max_backoff_num)...
    *(1-platform.ch_busy_prob)/(1-2*platform.ch_busy_prob)-(1-(platform.ch_busy_prob)^platform.max_backoff_num);
B=(platform.ch_busy_prob^platform.max_backoff_num)*(2^platform.max_backoff_num-1);
platform.avg_listen_delay=platform.unit_backoff*(A+B);

avg_listen_delay_simul=0;
len_backoff=0;
backoff_listen_energy=0;
Is_channel_IDLE=0;
m=1;
i=1;
while (Is_channel_IDLE==0)
     len_backoff=platform.unit_backoff*uniform_gen(0,2^m);
%      len_backoff=platform.unit_backoff*2^(m-1);
len_backoff_log(i)=len_backoff;
i=i+1;

    avg_listen_delay_simul=avg_listen_delay_simul+len_backoff;

    Is_channel_IDLE=bern_gen(platform.ch_idle_prob);
    
    m=m+1;
    if(m> platform.max_backoff_num) 
        break;
    end

end

platform.avg_listen_delay_simul=avg_listen_delay_simul;
    
avg_listen_delay_simul_log(u)=avg_listen_delay_simul;
% disp(['simul: ',num2str(platform.avg_listen_delay_simul)]);
% disp(['thy: ',num2str(platform.avg_listen_delay)]);

end
 disp(['simul: ',num2str(mean(avg_listen_delay_simul_log))]);
 disp(['thy: ',num2str(platform.avg_listen_delay)]);
 
 mean_num_thy(h)=platform.avg_listen_delay;
 mean_num(h)=mean(avg_listen_delay_simul_log);
A_log(h)=A;
end
plot(mean_num);hold on;
plot(mean_num_thy,'r');