Simulating Packet Transmit Receive Between WSN Nodes in Matlab

clear;
noOfNodes = 50;
rand('state', 0);
figure(1);
clf;
hold on;
L = 1000;
R = 200; % maximum range;
netXloc = rand(1,noOfNodes)*L;
netYloc = rand(1,noOfNodes)*L;
for i = 1:noOfNodes
plot(netXloc(i), netYloc(i), '.');
text(netXloc(i), netYloc(i), num2str(i));
for j = 1:noOfNodes
distance = sqrt((netXloc(i) - netXloc(j))^2 + (netYloc(i) - netYloc(j))^2);
if distance <= R
matrix(i, j) = 1; % there is a link;
line([netXloc(i) netXloc(j)], [netYloc(i) netYloc(j)], 'LineStyle', ':');
else
matrix(i, j) = inf;
end
end
end

   %data with headers
   packet_to_transmit = packets(source_node).outputQ(1);
   packets(source_node).outputQ(1) = [];
   %bits to transmit
   clean_packet_as_signal = convert_packet_to_signal(packet_to_transmit);
   %transmission might have dirtied the bits
   noisy_packet_as_signal = add_channel_noise(clean_packet_as_signal);
   %on receiver
   received_noisy_packet_as_signal = noisy_packet_as_signal;
   cleaner_packet_as_signal = clean_noisy_packet(received_noisy_packet_as_signal);
   received_packet_unchecked = convert_signal_to_data(cleaner_packet_as_signal);
   if ~is_valid_packet_for_us(destination_node, received_packet_unchecked)
     return;     %that is, drop the packet
   end
   received_packet_checked = received_packet_unchecked;
   packets(destination_node).inputQ(end+1) = received_packet_checked;