基于matlab的分簇异构无线传感器网络选举协议

1.算法描述

       为了进一步均衡网络能耗，延长网络生命周期，提出了一种基于最优分簇的能量异构无线传感器网络路由协议（OCRP）。OCRP协议考虑了最优簇首数K，将待测区域划分为K个固定分区，优化了成簇过程；在簇首选择阶段，充分考虑了节点的剩余能量、整个网络的能量以及节点与基站之间的距离，改进了簇头选举机制。

2.仿真效果预览

matlab2022a仿真结果如下：

3.MATLAB核心程序

countCHs=0;
%counter for CHs per round
rcountCHs=0;
cluster=1;
t=0;
countCHs;
rcountCHs=rcountCHs+countCHs;
flag_first_dead=0;
 
for r=0:1:rmax
    r;
 
  %Election Probability for Normal Nodes
  pnrm=( p/ (1+a*m) );
  %Election Probability for Advanced Nodes
  padv= ( p*(1+a)/(1+a*m) );
    
  %Operation for heterogeneous epoch
  if(mod(r, round(1/pnrm) )==0)
    for i=1:1:n
        S(i).G=0;
        S(i).cl=0;
    end
  end
 
 %Operations for sub-epochs
 if(mod(r, round(1/padv) )==0)
    for i=1:1:n
        if(S(i).ENERGY==1)
            S(i).G=0;
            S(i).cl=0;
        end
    end
  end
 
 
%hold off;
 
%Number of dead nodes
dead=0;
%Number of dead Advanced Nodes
dead_a=0;
%Number of dead Normal Nodes
dead_n=0;
 
%counter for bit transmitted to Bases Station and to Cluster Heads
packets_TO_BS=0;
packets_TO_CH=0;
%counter for bit transmitted to Bases Station and to Cluster Heads 
%per round
PACKETS_TO_CH(r+1)=0;
PACKETS_TO_BS(r+1)=0;
 
figure;
 
for i=1:1:n
    %checking if there is a dead node
    if (S(i).E<=0)
        plot(S(i).xd,S(i).yd,'red .');
        dead=dead+1;
        if(S(i).ENERGY==1)
            dead_a=dead_a+1;
        end
        if(S(i).ENERGY==0)
            dead_n=dead_n+1;
        end
        hold on;    
    end
    if S(i).E>0
        S(i).type='N';
        if (S(i).ENERGY==0)  
        plot(S(i).xd,S(i).yd,'o');
        end
        if (S(i).ENERGY==1)  
        plot(S(i).xd,S(i).yd,'+');
        end
        hold on;
    end
end
plot(S(n+1).xd,S(n+1).yd,'ks');
 
 
STATISTICS(r+1).DEAD=dead;
DEAD(r+1)=dead;
DEAD_N(r+1)=dead_n;
DEAD_A(r+1)=dead_a;
 
%When the first node dies
if (dead==1)
    if(flag_first_dead==0)
        first_dead=r
        flag_first_dead=1;
    end
end
 
countCHs=0;
cluster=1;
for i=1:1:n
    if(S(i).far~=-1)
    if(S(i).E>0 )
   temp_rand=rand;     
   if ( (S(i).G)<=0)
 
 %Election of Cluster Heads for normal nodes
 if( ( S(i).ENERGY==0 && ( temp_rand <= ( pnrm / ( 1 - pnrm * mod(r,round(1/pnrm)) )) ) )  )
 
            countCHs=countCHs+1;
            packets_TO_BS=packets_TO_BS+1;
            PACKETS_TO_BS(r+1)=packets_TO_BS;
            
            S(i).type='C';
            S(i).G=100;
            C(cluster).xd=S(i).xd;
            C(cluster).yd=S(i).yd;
            plot(S(i).xd,S(i).yd,'k*');
            
            distance=sqrt( (S(i).xd-(S(n+1).xd) )^2 + (S(i).yd-(S(n+1).yd) )^2 );
            C(cluster).distance=distance;
            C(cluster).id=i;
            X(cluster)=S(i).xd;
            Y(cluster)=S(i).yd;
            cluster=cluster+1;
            
            %Calculation of Energy dissipated
            distance;
            if (distance>do)
                S(i).E=S(i).E- ( (ETX+EDA)*(4000) + Emp*4000*( distance*distance*distance*distance )); 
            end
            if (distance<=do)
                S(i).E=S(i).E- ( (ETX+EDA)*(4000)  + Efs*4000*( distance * distance )); 
            end
        end     
    
 
 
 %Election of Cluster Heads for Advanced nodes
 if( ( S(i).ENERGY==1 && ( temp_rand <= ( padv / ( 1 - padv * mod(r,round(1/padv)) )) ) )  )