How can i get a matlab code for csma/ca

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I am currently working on cognitive Radio and I need a simulation source code for CSMA/CA. Could anyone please assist.

Thanks

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neethu subash 2022-7-13

clear all
close all
clc
cwmax=1023;
n1.datarate=10;
cw=31;  
cw_default=31;
reached=0;
toRetransmit=0;
sumDatarate = 8*n1.datarate;
DataSent = sumDatarate;
next_Sent=0;
bw=0;
nodeenergy = 50;
NWEinitial = nodeenergy * 8;
% % % % % % % % % % % % % % % % EXISTING
 for i=1:10
    if (DataSent<cw)
%         next_Sent = sumDatarate+ toRetransmit
        fprintf("\n\nPackets sent in iteration %i is: %i\n",i,DataSent);
        fprintf("CW size in %i is: %i\n",i,cw);
        reached=DataSent; 
        fprintf("Packets succeeded in iteration %i is: %i\n",i,reached);
        lostPackets=0 ;       
        fprintf("Packets lost in iteration %i is: %i\n",i,lostPackets);
        
        
         bw_available = cw;
         bw_used = DataSent;
         bw_wasted = bw_available - bw_used;         
         bw_available_E(i)=bw_available;
         bw_used_E(i) = bw_used;
         bw_wasted_E(i) = bw_wasted;
         fprintf("Bandwidth wasted_Existing in %i is: %i\n\n",i,bw_wasted);
         
         Eused_E = sum(bw_available_E)/5;
         Re = NWEinitial - Eused_E;
         Re_E = Re;
         fprintf("Energy utilized_Existing in %i is: %i\n",i,Eused_E);
         fprintf("Remaining Energy_Existing in %i is: %i\n\n",i,Re);
         
         
        cw = cw_default
        toRetransmit = 0;
        fprintf("Packets to Retransmit in iteration %i is: %i\n\n",i,lostPackets);
        lost(i) = lostPackets;
        succeeded(i)=reached;
        DataSent = toRetransmit + sumDatarate;
       
    else
%         next_Sent = sumDatarate+ toRetransmit
        fprintf("\n\nPackets sent in iteration %i is: %i\n",i,DataSent);
        fprintf("CW size in %i is: %i\n",i,cw);
        reached=cw;
        fprintf("Packets succeeded in iteration %i is: %i\n",i,reached);
        lostPackets=DataSent - cw ;
         fprintf("Packets lost in iteration %i is: %i\n",i,lostPackets);
         
         
         bw_available = cw;
         bw_used = cw;
         bw_wasted = bw_available - bw_used;         
         bw_available_E(i)=bw_available;
         bw_used_E(i) = bw_used;
         bw_wasted_E(i) = bw_wasted;
         fprintf("Bandwidth wasted in %i is: %i\n\n",i,bw_wasted);
        
         Eused_E = sum(bw_available_E)/5;
         Re = NWEinitial - Eused_E;
         Re_E = Re;
         fprintf("Energy utilized_Existing in %i is: %i\n",i,Eused_E);
         fprintf("Remaining Energy_Existing in %i is: %i\n\n",i,Re);
        
       
         
         
        cw = bitsll(cw,1)+3
        toRetransmit = lostPackets;
        fprintf("Packets to Retransmit in iteration %i is: %i\n\n",i,lostPackets);            
        lost(i) = lostPackets;
        succeeded(i)=reached;
        DataSent = toRetransmit + sumDatarate;
    end
    
 end
Packets sent in iteration 1 is: 80
CW size in 1 is: 31
Packets succeeded in iteration 1 is: 31
Packets lost in iteration 1 is: 49
Bandwidth wasted in 1 is: 0
Energy utilized_Existing in 1 is: 6.200000e+00
Remaining Energy_Existing in 1 is: 3.938000e+02
cw = 65
Packets to Retransmit in iteration 1 is: 49
Packets sent in iteration 2 is: 129
CW size in 2 is: 65
Packets succeeded in iteration 2 is: 65
Packets lost in iteration 2 is: 64
Bandwidth wasted in 2 is: 0
Energy utilized_Existing in 2 is: 1.920000e+01
Remaining Energy_Existing in 2 is: 3.808000e+02
cw = 133
Packets to Retransmit in iteration 2 is: 64
Packets sent in iteration 3 is: 144
CW size in 3 is: 133
Packets succeeded in iteration 3 is: 133
Packets lost in iteration 3 is: 11
Bandwidth wasted in 3 is: 0
Energy utilized_Existing in 3 is: 4.580000e+01
Remaining Energy_Existing in 3 is: 3.542000e+02
cw = 269
Packets to Retransmit in iteration 3 is: 11
Packets sent in iteration 4 is: 91
CW size in 4 is: 269
Packets succeeded in iteration 4 is: 91
Packets lost in iteration 4 is: 0
Bandwidth wasted_Existing in 4 is: 178
Energy utilized_Existing in 4 is: 9.960000e+01
Remaining Energy_Existing in 4 is: 3.004000e+02
cw = 31
Packets to Retransmit in iteration 4 is: 0
Packets sent in iteration 5 is: 80
CW size in 5 is: 31
Packets succeeded in iteration 5 is: 31
Packets lost in iteration 5 is: 49
Bandwidth wasted in 5 is: 0
Energy utilized_Existing in 5 is: 1.058000e+02
Remaining Energy_Existing in 5 is: 2.942000e+02
cw = 65
Packets to Retransmit in iteration 5 is: 49
Packets sent in iteration 6 is: 129
CW size in 6 is: 65
Packets succeeded in iteration 6 is: 65
Packets lost in iteration 6 is: 64
Bandwidth wasted in 6 is: 0
Energy utilized_Existing in 6 is: 1.188000e+02
Remaining Energy_Existing in 6 is: 2.812000e+02
cw = 133
Packets to Retransmit in iteration 6 is: 64
Packets sent in iteration 7 is: 144
CW size in 7 is: 133
Packets succeeded in iteration 7 is: 133
Packets lost in iteration 7 is: 11
Bandwidth wasted in 7 is: 0
Energy utilized_Existing in 7 is: 1.454000e+02
Remaining Energy_Existing in 7 is: 2.546000e+02
cw = 269
Packets to Retransmit in iteration 7 is: 11
Packets sent in iteration 8 is: 91
CW size in 8 is: 269
Packets succeeded in iteration 8 is: 91
Packets lost in iteration 8 is: 0
Bandwidth wasted_Existing in 8 is: 178
Energy utilized_Existing in 8 is: 1.992000e+02
Remaining Energy_Existing in 8 is: 2.008000e+02
cw = 31
Packets to Retransmit in iteration 8 is: 0
Packets sent in iteration 9 is: 80
CW size in 9 is: 31
Packets succeeded in iteration 9 is: 31
Packets lost in iteration 9 is: 49
Bandwidth wasted in 9 is: 0
Energy utilized_Existing in 9 is: 2.054000e+02
Remaining Energy_Existing in 9 is: 1.946000e+02
cw = 65
Packets to Retransmit in iteration 9 is: 49
Packets sent in iteration 10 is: 129
CW size in 10 is: 65
Packets succeeded in iteration 10 is: 65
Packets lost in iteration 10 is: 64
Bandwidth wasted in 10 is: 0
Energy utilized_Existing in 10 is: 2.184000e+02
Remaining Energy_Existing in 10 is: 1.816000e+02
cw = 133
Packets to Retransmit in iteration 10 is: 64

Hi, can some one please help me to modify the code to enable many number of nodes..that is with many sources and destinations with saturated data..Thanks inn advance

Walter Roberson 2022-7-13

You need more comments, such as what cw means.

Which variable(s) represent nodes in your code?

Is bandwidth shared? Are links completely independent, completely shared, partially shared? Which part of your code is modeling how much of a shared band is being currently used?

neethu subash 2022-7-14

the above code is doing contention window size variations as how it works in csma/ca binary backoff. Only one node is sending in my code..that is one sender..

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