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+// Example 9.7
+// Calculation of the (a) the total data rate and (b) the spectral efficiency.
+// Page no 413
+
+clc;
+clear;
+close;
+
+//Given data
+M=16;
+np=2;              // No of polarization
+nc=24;             // No of channels
+bs=28*10^9;      // Symbol rate per polarization
+
+// (a) The total data rate
+B=bs*log2(M);
+T=B*np*nc;
+
+
+// (b) The spectral efficiency
+N=bs*nc;
+s=T/N;
+
+//Displaying results in the command window            
+printf("\n The total data rate  = %0.3f Tb/s ",T*10^-12);
+
+printf("\n The spectral efficiency = %0.1f b/s/Hz ",s);
+