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+clc;
+//page no 423
+//problem no 12.5.1
+// binary unipolar signal is given
+Pavg=6*10^-12;//in W
+d=0.02*10^-6;//pulse duration in sec
+T=550;//equivalent noise temp in K
+Eb=Pavg*d;//avg energy per pulse
+No=1.38*10^-23 *T;
+r=Eb/No;
+//Bit error probability is 
+Pbe=1/2 * erfc(sqrt(r/2));
+disp(Pbe,'The bit error probability');
+\ No newline at end of file