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+// Exa 17.8
+// To calculate minimum signal power required and maximum allowable path loss.
+
+clc;
+clear all;
+
+N0=-174;//Noise density in dBm/Hz
+Bc=1.25;//Channel bandwidth in mHz
+Rc=1.2288;//Chip rate in Mcps
+Nf=6;  //Receiver Noise figure in dB
+Pt=27;  //Effective radiated power from mobile in dBm
+Lct=0.5;  //Transmitter cable and connector loss in dBm
+Lbody=1.5;//Body loss in dB
+Lcr=2;  //Receiver cable and connector loss in dB
+Mint=0;  //Interference margin in dB
+Mfading=2;//fast fadinf margin in dB
+Lpent=8;//Penetration loss in dB
+Gm=0;//Transmitter antennna gain in dBi
+Gb=12;//Receiver antenna gain in dBi
+Fm=8;//Fade margin in dB
+Eb_Nt=7;// in dB
+
+//solution
+Nth=N0+Nf;
+S_Nt=Eb_Nt+10*log10((Rc*10^6)/(Bc*10^6));
+Smin=S_Nt+10*log10(Rc*10^6)+Nth;
+Lpmax=(Pt-Smin)+(Gb+Gm)-(Lbody+Lct+Lcr+Fm+Lpent)-Mint-Mfading;
+printf('Minimum signal power required is %.2f dBm \n ',Smin);
+printf('Maximum allowable path loss is %.2f dB \n ',Lpmax);