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+// Example no 7.3

+// To determine a)the maximum Doppler shift b)the coherence time of the channel c)the maximum number of symbolsthat could be transmitted

+// Page no. 373

+

+clc;

+clear all;

+

+//Given data

+f=900*10^6;                                                  // Carrier frequency in Hz

+c=3*10^8;                                                    // Speed of ligth in air (m/s)

+v=80;                                                        // Velocity of mobile in km/hr

+v=v*(5/18);                                                  // Velocity of mobile in m/s

+lambda=c/f;                                                  // Carrier wavelength in meter

+

+// a)To determine the maximum Doppler shift

+fd=v/lambda;                                                 // The maximum Doppler shift in Hz

+

+// b)To determine the coherence time of the channel

+Tc=sqrt(9/(16*%pi*fd^2));                                   // The coherence time of the channel

+// Answer is varrying due to round-off error

+

+// c)To determine the maximum number of symbols that could be transmitted with symbol rate 24.3 ksymbols/sec

+Rs=24.3*10^3;                                              // Symbol rate in symbols/sec

+Nb=Tc*Rs;                                                  // The maximum number of transmitted symbols

+

+// Displaying the result in command window

+printf('\n The maximum Doppler shift = %0.2f Hz',fd);

+printf('\n The coherence time of the channel = %0.2f ms',Tc*10^3);

+printf('\n The maximum number of symbols that could be transmitted with symbol rate 24.3 ksymbols/sec = %0.0f symbols',Nb);