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+//Example 4.7.1
+//Calculate the overall CN ratio
+
+//Variables
+clc
+clear
+CNdnratio = 100
+CNupratio = 100
+
+CIratio = 24
+CIratioindB = 0.004
+CN0 = (1/((1/CNupratio) + (1/CNdnratio)))
+CN1 = (1/((1/CNupratio) + (1/CNdnratio) + CIratioindB))
+
+//result
+printf("CN0 ratio is %f\n",CN0)
+printf("The overall CN0 ratio at earth receiveing station is %f ",CN1)