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+// Example 8.6
+// To find the mean number of signal photons required in a shot noise-limited coherent communication system based on OOK for the following cases: (i) balanced homodyne receiver; (ii)balanced heterodyne receiver (a) a balanced homodyne or (b) a balanced heterodyne
+// Page no. 384
+
+clc;
+clear;
+close;
+
+// Given data
+Pb=1*10^-9;                                         //Error probability
+neta=1;                                          //quantum efficiency
+
+//a)for balanced homodyne receiver
+Ns=(erfinv(1-(2*neta*Pb)))^2;
+
+//(b)for balanced heterodyne receiver
+Ns1=(erfinv(1-(2*neta*Pb))*sqrt(2))^2;
+
+//Displaying the result in command window
+printf("\n For a balanced homodyne receiver with PSK signal = %0.0f  ",Ns);
+printf("\n For a balanced heterodyne receiver with PSK signal = %0.0f  ",Ns1);