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+// Exa 10.1
+// To calculate the received signal power at the receiver antenna and the SNR of the received signal.
+
+clc;
+clear all;
+
+D=10000;  //in metres
+TxEIRP=30;  //Effective Isotropic Radiated Power(EIRP)dBW
+lamda=0.2;  //in metres
+Pt=10;  //Transmitted power in dBW
+Gt=20; //transmitter gain in dBi
+Gr=3;  //receiver gain in dBi
+Lo=6;//total system lossses in dB
+Nf=5;  //noise figure in dB
+BW=1.25; //mHz
+k=1.38*10^-23;  //Boltzmann constant
+T=290;  //temperature in degree kelvin
+
+//solution
+Lp=20*log10(lamda/(4*%pi*D));   //free space loss
+Pr=Lp+Pt+Gt+Gr-Lo;// received power in dBW
+
+No=10*log10(k*T);  //Noise density in dBW
+NO=No+30;  //factor of '30' to convert from dBW to dBm
+Pn=Nf+10*log10(BW*10^6)+NO;// noise signal power in dBm
+SNR=(Pr+30)-Pn;
+printf('The received signal power is %d dBm\n ',round(Pr+30)); //factor of '30' to convert from dBW to dBm
+printf('SNR is %d dB\n',SNR);