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// Example no 5.6
// To determine proper spatial sampling interval for small scale propagation, number of samples required over 10m, time required to make these measurements and Doppler spread for this channel
// Page no. 204
clc;
clear all;
// Given data
fc=1900*10^6; // Carrier frequency in Hz
v=50; // Velocity of propagation in m/s
c=3*10^8; // Speed of ligth in air in m/s
Tc=(9*c)/(16*%pi*v*fc); // Coherence time
// The spatial sampling interval
deltax=(v*Tc)/2; // Spatial sampling interval in meter
// The number of samples required over 10m travel distance
d=10; // Distance to be travelled
Nx=d/deltax; // Number of samples required over 10m
// Answer is varrying due to round-off error
// The time required to make these measurements
t=d/v; // Time required to make these measurements
// Doppler spread for this channel
BD=(v*fc)/c; // Doppler spread for this channel
// Answer is varrying due to round-off error
// Displaying the result in command window
printf('\n The proper spatial sampling interval for small scale propagation = %0.2f cm',deltax*10^2);
printf('\n The number of samples required over 10m travel distance = %0.0f',Nx);
printf('\n The time required to make these measurements = %0.1f seconds',t);
printf('\n The Doppler spread for this channel = %0.2f Hz',BD);
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