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+// Exa 9.2
+// To calculate amplitude A of a carrier signal.
+
+clc;
+clear all;
+
+Pe=10^-6;//Probability of error
+No=10^-10; // PSD in W/Hz
+R=100*10^3; //data rate in bps
+
+//solution
+disp("From Example 9.1, Eb/N0= 10.54dB (11.32) for Pe=10^-6 ");
+//Therefore
+Eb_No=11.32; //From Exa. 9.1
+// Eb/No = A^2/(2*No*R);
+A=sqrt(2*No*(Eb_No)*R);
+printf(' Amplitude of a carrier signal is %.3f mV',A*1000);
+