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+// Example no 5.7
+// To compute the positive-going lvel crossing rate and maximum velocity of mobile
+// Page no. 224
+
+clc;
+clear all;
+
+// Given data
+rho=1;                                       // Value of normalized level of fading amplitude to rms amplitude
+fm=20;                                       // Maximum Doppler frequency in Hz
+fc=900*10^6;                                 // Carrier frequency in Hz
+c=3*10^8;                                    // Speed of ligth in air in m/s
+
+// The positive-going level crossing rate
+NR=sqrt(2*%pi)*fm*rho*exp(-rho^2);           // Number of zero level crossings per second
+lambda=c/fc;                                 // Carrier wavelength
+
+// The maximum velocity of mobile
+v=fm*lambda;                                 // Maximum velocity of mobile in m/s
+v=v*(18/5);                                  // Maximum velocity of mobile in km/hr
+
+// Displaying the result in command window
+printf('\n The positive-going level crossing rate = %0.2f crossings per second',NR);
+printf('\n The maximum velocity of mobile = %0.0f Km/Hr',v);