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+// Example no 6.9
+// To determine phase and values of Ik and Qk during transmission of bit stream 001011 using pi/4 DQPSK.
+// Page no. 307
+
+clc;
+clear all;
+
+// Given data
+theta0=0;                                                                // Initial phase in rad
+phi1=%pi/4;                                                              // Carrier phase shift for the input bit pair 11 [Feh91], [Rap91b]
+phi2=(3*%pi)/4;                                                          // Carrier phase shift for the input bit pair 01 [Feh91], [Rap91b]
+phi3=(-3*%pi)/4;                                                         // Carrier phase shift for the input bit pair 00 [Feh91], [Rap91b]
+phi4=-%pi/4;                                                             // Carrier phase shift for the input bit pair 10 [Feh91], [Rap91b]
+
+// For transmission of first pair of bits 00
+theta1=theta0+phi3;                                                      // Phase of signal during transmission of first bit pair 00
+I1=cos(theta1);                                                          // In-phase pulse produced at the output of signal mapping
+Q1=sin(theta1);                                                          // Quadrature pulse produced at the output of signal mapping
+
+// For transmission of second pair of bits 10
+theta2=theta1+phi4;                                                      // Phase of signal during transmission of second bit pair 10
+I2=cos(theta2);                                                          // In-phase pulse produced at the output of signal mapping
+Q2=sin(theta2);                                                          // Quadrature pulse produced at the output of signal mapping
+
+// For transmission of third pair of bits 11
+theta3=theta2+phi1;                                                      // Phase of signal during transmission of third bit pair 11
+I3=cos(theta3);                                                          // In-phase pulse produced at the output of signal mapping
+Q3=sin(theta3);                                                          // Quadrature pulse produced at the output of signal mapping
+
+// Displaying the result in command window
+printf('\n Phase of signal during transmission of first bit pair 00 = %0.0f degree',theta1*(180/%pi));
+printf('\n In-phase pulse produced during transmission of first bit pair 00 = %0.3f',I1);
+printf('\n Quadrature pulse produced during transmission of first bit pair 00 = %0.3f',Q1);
+
+printf('\n \n Phase of signal during transmission of second bit pair 10 = %0.0f degree',theta2*(180/%pi));
+printf('\n In-phase pulse produced during transmission of second bit pair 10 = %0.0f',I2);
+printf('\n Quadrature pulse produced during transmission of second bit pair 10 = %0.0f',Q2);
+
+printf('\n \n Phase of signal during transmission of third bit pair 11 = %0.0f degree',theta3*(180/%pi));
+printf('\n In-phase pulse produced during transmission of third bit pair 11 = %0.3f',I3);
+printf('\n Quadrature pulse produced during transmission of third bit pair 11 = %0.3f',Q3);