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+// Exa 9.5
+// To calculate-
+// a) 3-dB bandwidth for a Gaussian low-pass ﬁlter,
+// b) 99.99% power bandwidth in the RF channel, and
+// c) bit error probability for GMSK.
+
+clc;
+clear all;
+
+R=270; //data rate in kbps
+Eb_No=6; // in dB
+GMSK=0.3; //Gaussian minimum shift keying
+
+//solution
+Tb=1/R *10^3; //in microsec
+B=GMSK/Tb;
+printf('3-dB BW for a gaussian low pass filter is %.3f kHz\n',B*1000);
+disp("The 3-dB bandwidth is 81.08 kHz. to determine the 99.99% power bandwidth, we use Table 9.3 to ﬁnd that 1.41*Rb is the required value and degradation factor(beta)= 0.89");
+PowerBW=1.41*R;
+DegradFac=0.89;
+Pe=erfc(sqrt(2*DegradFac*10^(0.1*Eb_No)));
+printf(' Power bandwidth in the RF channel is %.1f kHz\n ',PowerBW);
+printf('Bit error probability for GMSK is %f * 10^-5\n',Pe*10^5);