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+//Exa 17.10
+//To calculate No of users that can be supported on the downlink of the WCDMA network.
+
+clc;
+clear all;
+
+Rc=3.84;//chip rate in Mcps
+N=3;//Noise rise in dB
+OF=0.8;//orthogonality factor
+B=0.55;//Interference from other cells 
+Eb_N0=4;//in dB
+Sec_Eff=0.85;//Sector efficiency
+Pwr_Eff=0.80;//Power control efficiency
+Y=1.2; //Retransmit rate
+X=10; //10MB at 384Kbps
+X1=2;  //2MB at 144Kbps
+X2=1;  //1MB at 64Kbps
+
+//solution
+//Assuming Voice activity=Vf=1
+Vf=1;
+AvgDR=Y*X*10^6*(1/3600)+Y*X1*10^6*(1/3600)+Y*X2*10^6*(1/3600);
+CLoad=(N-1)/(N+1);
+DLcap=(Rc*10^6*Pwr_Eff*Sec_Eff)/(((10^(Eb_N0/10))*(B+OF)*Vf));
+Allowcap=CLoad*DLcap;
+users=Allowcap/AvgDR;
+printf('NO of users that can be supported on the downlink of the WCDMA network are %d \n ',round(users));