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+//=====================================================================================
+//Chapter 15 example 2
+
+clc;clear all;
+
+//variable decalaration
+N     = 20;       //noise figure indB
+B     = 1000;     //bandwidth in Hz
+
+//calculations
+x     = B/(10^6);
+//log(10**-3)= (-3)*log(1) = -3
+M     = (-114)+((10*(-3))*(1))+N;    //log(1) = 1
+
+//result
+mprintf("minimum detectable signal = %3.2f dBm",M);
+