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+// Exa 6.6
+// To calculate frame efﬁciency and the number of channels per frame.
+
+clc;
+clear all;
+
+Nr=2;// number of reference bursts per frame
+Nt=24;  // number of trafﬁc bursts (slots) per frame(120msec)
+FL=120;  //Frame length in msec
+Br=148;  // number of overhead bits per reference burst
+Bp=34; // number of overhead bits per preamble per slot 
+Bg=8.25;//number of equivalent bits in each guard time interval 
+Tf=120; // frame duration in msec
+Rrf=270.83333333;  // bit rate of the RF channel in kbps
+R=22.8;  //bit rate of each channel in kbps
+
+//solution
+B0=Nr*(8*Br)+Nt*(8*Bp)+(Nt+Nr)*(8*Bg);//The number of overhead bits per frame
+Bt=FL*10^-3*Rrf*10^3;//The total number of bits per frame 
+Eff=(1-B0/Bt)*100;
+CH_Frame=(Eff/100)*Rrf/R;//No of channels/frame
+printf('The frame efficiency is %.2f percent\n ',Eff);
+printf('Number of channels/frame are %d\n',round(CH_Frame));