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+// Exa 17.7
+// To calculate downlink cell load-factor and number of voice users per cell for a WCDMA system.
+
+clc;
+clear all;
+
+Ri=12.2*10^3;//Information rate in bps
+Rc=3.84*10^6;// Chip rate in chips per second
+Eb_Nt=4;   // in dB
+Eb_Nt=10^(Eb_Nt/10);
+B=0.5;//Average interference factor due to other cells
+Zeta=0.6; // orthogonality factor
+Imargin=2;//Interference margin(3 dB)
+Vi=0.65  //assuming Channel activity factor as 0.65
+
+//solution
+Loadfactor_peruser=(Zeta+B)*(1/((Rc/Ri)*(1/Eb_Nt)*(1/Vi)))
+printf('Downlink cell load factor is %.4f \n ',Loadfactor_peruser);
+cellLoading=(Imargin-1)/Imargin;
+Voiceusers=cellLoading/Loadfactor_peruser;
+printf('No of voice users per cell are %d \n ',Voiceusers);