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// Example 5.9
// To find the in-phase and quadrature components of the current of a polarization modulated (PM) QPSK signal
// Page no. 241
clc;
clear;
// Given data
theta1=%pi/4;
Sx=expm(%i*theta1); // Signal data in x-polarization
theta2=(5*%pi)/4;
Sy=expm(%i*theta2); // Signal data in y-polarization
PLO=10; // Local oscillator power in mW from Example 5.8
Pr=0.1585; // Power at receiver in mW from Example 5.8
R=0.9; // Reflectivity
// The complex photocurrent corresponding to x-polarization
Ix= (R*sqrt(Pr*PLO))*Sx/2; // The complex photocurrent corresponding to x-polarization
Iix=real(Ix); // In-phase component of phtocurrent corresponding to x-polarization
Iqx=-imag(Ix); // Quadrature component of phtocurrent corresponding to x-polarization
// The complex photocurrent corresponding to y-polarization
Iy= (R*sqrt(Pr*PLO))*Sy/2; // The complex photocurrent corresponding to y-polarization
Iiy=real(Iy); // In-phase component of phtocurrent corresponding to y-polarization
Iqy=-imag(Iy); // Quadrature component of phtocurrent corresponding to y-polarization
// Display result on command window
printf('\n In-phase component of phtocurrent corresponding to x-polarization = %0.4f mA',Iix);
printf('\n Quadrature component of phtocurrent corresponding to x-polarization = %0.4f mA',Iqx);
printf('\n In-phase component of phtocurrent corresponding to y-polarization = %0.4f mA',Iiy);
printf('\n Quadrature component of phtocurrent corresponding to y-polarization = %0.4f mA',Iqy);
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