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+//Page Number: 10.43
+//Example 10.27
+clc;
+//Given
+Rb=4.8D+3; //b/s
+bw=3.2D+3; //Hz
+
+//BPSK can give maximum spectral efficiency of 1bps/Hz, therefore not suitable
+//QPSK can give twice spectral efficiency,2bps/Hz, therefore
+qpsk=2*bw;
+//PSK can give thrice spectral efficiency,3bps/Hz, therefore
+psk=3*bw;
+
+//QPSK is most suitable
+Rs=Rb/2;
+//Roll off Factor
+a=(bw/Rs)-1;
+ap=a*100;
+disp('%',ap,'Roll off factor:');