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+// Example no 5.1
+// To compute received carrier frequency if mobile is moving a)towards the transmitter b)away from the transmitter c)in the direction perpendicular to arrival direction of transmitted signal
+// Page no. 180
+
+clc;
+clear all;
+
+// Given data
+fc=1850*10^6;                                            // Carrier frequency in Hz
+c=3*10^8;                                                // Speed of ligth in m/s
+v=60;                                                    // Speed of receiver (vehicle) in mph
+v=v*0.44704;                                             // Speed of receiver (vehicle) in m/s
+lambda=0.162;//c/f;                                      // Wavelength in m
+
+// a)To compute received carrier frequency if mobile is moving towards the transmitter
+theta=0;                                                 // Angle between direction of receiver and transmitter
+fd=(v/lambda)*cos(theta);                                // Doppler shift
+f=(fc+fd)*10^-6;                                         // Received carrier frequency in MHz
+
+// Displaying the result in command window
+printf('\n The received carrier frequency when mobile is moving towards the transmitter = %0.5f MHz',f);
+
+// b)To compute received carrier frequency if mobile is moving away from the transmitter
+theta=180;                                               // Angle between direction of receiver and transmitter
+fd=(v/lambda)*cos(theta);                                // Doppler shift
+f=(fc+fd)*10^-6;                                         // Received carrier frequency in MHz
+
+// Displaying the result in command window
+printf('\n The received carrier frequency when mobile is moving away from the transmitter = %0.6f MHz',f);
+
+// c)To compute received carrier frequency if mobile is moving in the direction perpendicular to arrival direction of transmitted signal
+theta=90;                                                // Angle between direction of receiver and transmitter
+fd=(v/lambda)*cos(theta);                                // Doppler shift
+f=(fc+fd)*10^-6;                                         // Received carrier frequency in MHz
+
+// Displaying the result in command window
+printf('\n The received carrier frequency when mobile is moving in the direction perpendicular to arrival direction of transmitted signal = %0.0f MHz',f);