Home Network Basis: Transmission Environments and Wired/Wireless Protocols

6.8. MATLAB Files

6.8.1. CRC Process

gx=[1 0 0 0 0 0 1 0 0 1 1 0 0 0 0 0 1 0 0 0 1 1 1 0 1 1 0 1 1 0 1 1 1];
x=ceil(2*rand(1,8000)-1);
xs=~x(1:33);
for i=1:length(x)-33
    if xs(1)~=0
        xs=xor(xs,gx);
    end
    xs(1:32)=xs(2:33);
    xs(33)=x(i+33);
end
fcs=~xs

6.8.2. Aloha and Slotted Aloha Simulation

 %SIMULATION PARAMETERS %simulation for pure Aloha protocol %total simulation time in seconds runtime=0.2; %total number of stations nstation=10; %transmission throughput of the media in bits per second netthrou=10e6; %frame size in bits fsize=8000; %avarage frame arrival rate per second for each station %frate=10; for frate=1:5:150 %average frame arrival rate per simulation iteration trh=frate/10000; %random wait window in number of simulation iterations wwind=100; ...