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+// Exa 6.10
+// To calculate the data link protocol efﬁciency with 
+//(1) Stop and Wait protocol — full duplex,
+//(2) SRP with window size W=8, and 
+//(3) Go-Back-N protocol with window size W=8.
+
+clc;
+clear all;
+
+Tprop=4;  //maximum propogation delay in sec
+R=10; // data rate in Mbps
+PackLen=400; //data packet length in bits
+ACK=20;  //length of ACK packet in bits
+Tproc=1; //processing time(sec)
+p=0.01;//probability that a data packet or its ACK can be corrupted during transmission
+
+//solution
+Tp=PackLen/R; //packet transmission time in microsec
+Ta=ACK/R; // transmission time for an ACK in microsec
+T=Tp+2*Tprop+2*Tproc+Ta;// total time for transmission time 
+// Stop and wait ARQ
+Eff0=(1-p)*Tp/((1-p)*T+p*Tp);
+//SRP with window size W=8
+W=8;
+Eff1=(2+p*(W-1))/(2+p*(3*W-1));
+//Go-Back-N protocol with window size W=8
+Eff2=1/(1+W*(p/(1-p)));
+printf('The data link protocol efficiency with Stop and Wait protocol, SRP and GBN are \n %.3f, %.3f abd %.3f respectively\n',Eff0,Eff1,Eff2);