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+clc;
+//page 105
+//problem 2.10
+
+//We know that, Probabilty of error(P_error) for the signal correpted by Gaussian channel variance sigma^2 where signal having voltage levels as 0&V is (1/2)*erfc(V/(2*sqrt(2)*sigma))
+
+//P_error for V = 4 & sigma^2 =2
+V = 4
+sigma = sqrt(2)
+P_error = (1/2)*erfc(V/(2*sqrt(2)*sigma))
+
+disp('Probabilty of error for V = 4 & sigma^2 =2 is '+string(P_error))
+
+//P_error for V = 2 & sigma^2 =2
+V = 2
+sigma = sqrt(2)
+P_error = (1/2)*erfc(V/(2*sqrt(2)*sigma))
+
+disp('Probabilty of error for V = 2 & sigma^2 =2 is '+string(P_error))
+
+//P_error for V = 4 & sigma^2 =4
+V = 4
+sigma = sqrt(4)
+P_error = (1/2)*erfc(V/(2*sqrt(2)*sigma))
+
+disp('Probabilty of error for V = 4 & sigma^2 =4 is '+string(P_error))
+
+//P_error for V = 8 & sigma^2 =2
+V = 8
+sigma = sqrt(2)
+P_error = (1/2)*erfc(V/(2*sqrt(2)*sigma))
+
+disp('Probabilty of error for V = 8 & sigma^2 =2 is '+string(P_error))