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+//Chapter-11 example 21
+//=============================================================================
+clc;
+clear;
+//input data
+Noise_power = -50;//noise power in dBm
+Fl = 1*10^6;//lower cutoff frequency in Hz
+Fh = 21*10^6;//upper cutoff frequency in Hz
+
+//calculation
+BW = Fh-Fl;//bandwidth
+NP =10^-8//noise power in watts; -50dBm = 10log10(NP) =>10^-5 mwatts
+NPSD = NP/BW;//noise power spectral density in W/Hz
+
+//output
+mprintf('Noise Power Spectral Density is %3.0e W/Hz',NPSD);
+
+//==============end of the program=============================================