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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);
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