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//Example 12.17
//Program to calculate:
//(a)The optimium receiver bandwidth
//(b)The peak to peak signal power to rms noise ratio
clear;
clc ;
close ;
//Given data
Tr=12*10^(-9); //s - SYSTEM RISE TIME
fo=20*10^6; //Hz - NOMINAL PULSE RATE
fd=5*10^6; //Hz - PEAK TO PEAK FREQUECY DEVIATION
M=60; //APD MULTIPLICATION FACTOR
R=0.7; //APD RESPONSIVITY
B=6*10^6; //Hz - BASEBAND NOISE BANDWIDTH
Ppo=10^(-7); //Watt - PEAK OPTICAL POWER
in_sq_bar=10^(-17); //A^2 - RECEIVER MEAN SQUARE NOISE CURRENT
//(a)The optimium receiver bandwidth
Bopt=1/Tr;
To=1/fo;
//(b)The peak to peak signal power to rms noise ratio
SNR=3*(To*fd*M*R*Ppo)^2/((2*%pi*Tr*B)^2*in_sq_bar);
//Displaying the Results in Command Window
printf("\n\n\t (a)The optimium receiver bandwidth is %0.1f MHz.",Bopt/10^6);
printf("\n\n\t (b)The peak to peak signal power to rms noise ratio is %0.1f dB.",10*log10(SNR));
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