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+// Example 9.4
+// Calculation of the maximum reach up to which the carrier orthogonality is preserved.
+// Page no 408
+
+clc;
+clear;
+close;
+
+//Given data
+b=22*10^-27;                 // Power launched in port 1
+T=1.28*10^-9;                // Guard interval
+N=128;                       //  Subcarriers
+f=78.125*10^6;               // Frequency spacing between subcarriers
+
+// Bit rate of communication system
+I=T/(b*2*%pi*N*f);
+I=I*10^-3;
+
+
+
+//Displaying results in the command window            
+printf("\n The maximum reach up to which the carrier orthogonality is preserved = %0.0f km ",I);
+
+// The answers vary due to round off error