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+// Exa 9.4
+// To calculate
+//(a) the frequency shift between binary 1 and binary 0,
+//(b) the transmitted frequencies if the carrier frequency is 900 MHz, and 
+//(c) the bandwidth efﬁciency in bps/Hz.
+
+clc;
+clear all;
+
+CHBW=200; //Channel BW in KHz
+R=270.83; //Data rate in kbps
+Fc=900;  //carrier frequency in MHz
+
+//solution
+FreqShift=0.5*R;
+//Transmitted Frequencies
+Fh=Fc*1000+0.25*R;//Max
+Fl=Fc*1000-0.25*R;//Min
+BWEff=R/CHBW;
+printf('The frequency shift between binary 1 and binary 0 is %.3f kHz\n ',FreqShift);
+printf('Maximum and Minimum value of transmitted frequencies are %.4f mHz and %.4f mHz respectively\n ',Fh/1000,Fl/1000);
+printf('Bandwidth efficiency is %.2f bps/Hz',BWEff);