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// Example 4.2
// To find a)transmitter power in dBm b)Transmitter power in dBW and the received power of antenna in dBm at free space distance of 100m from antenna and 10km
// Page No.109
clc;
clear all;
// Given data
Pt=50; // Transmitter power in W
fc=900*10^6; // Carrier frequency in Hz
C=3*10^8; // Speed of light in m/s
//a)Transmitter power in dBm
PtdBm=round(10*log10(Pt/(1*10^(-3)))); //Transmitter power in dBm
// Displaying the result in command window
printf('\n Transmitter power = %0.1f dBm',PtdBm);
//b)Transmitter power in dBW
PtdBW=round(10*log10(Pt/1)); //Transmitter power in dBW
// Displaying the result in command window
printf('\n Transmitter power = %0.1f dBW',PtdBW);
// To find receiver power at 100m
Gt=1; //Transmitter gain
Gr=1; //Receiver gain
d=100; //Free space distance from antenna in m
L=1; //System loss factor since no loss in system
lambda=C/fc; //Carrier wavelength in m
Pr=(Pt*Gt*Gr*lambda^2)/((4*%pi)^2*d^2*L); //Receiver power in W
PrdBm=10*log10(Pr/10^(-3)); //Receiver power in dBm
//Displaying the result in command window
printf('\n Receiver power = %0.1f dBm',PrdBm);
//For Pr(10km)
d0=100; //Reference distance
d=10000; //Free space distance from antenna
Pr10km=PrdBm+20*log10(d0/d); //Received power at 10km from antenna in dBm
//Displaying the result in command window
printf('\n Receiver power at 10km from antenna = %0.1f dBm',Pr10km);
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