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+// Exa 6.3
+// To calculate spectral efficiency of TDMA.
+
+clc;
+clear all;
+
+Tf=40;  //Frame duration in msec
+Mt=6;   // Frames per slot
+Bu=30; //bandwidth(KHz) of an individual user during his or her time slot
+Nu=395;//  number of users sharing the same time slot in the system, but having access to different frequency sub-bands
+Bw=12.5; // in MHz
+DR=16.2;//Data rate in kbps
+FDur=40; // Frame duration in msec
+slots=6; //No of slots per time frame
+IndiRate=16.2; //Individual data rate in kbps
+Srate=13;  //Speech rate in kbps
+
+//solution
+TimeSlot=(Srate/IndiRate)*(FDur/slots);
+Seff=TimeSlot*slots*Bu*Nu/(FDur*Bw*1000);
+printf('Multiple access spectral efficiency of TDMA is %.2f\n ',Seff);
+printf('The overhead portion of the frame is %d percent \n ',round((1-Seff)*100));