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+//Page Number: 8.11;
+//Example 8.9
+clc;
+
+//(a)Noise Figure
+//Given
+//Loss Fcator
+IL=1.5; //dB
+IL1=(10^(IL/10));
+
+//Noise figure
+F1=1.41;
+G1=1/F1;
+
+G2=10; 
+GG2=(10*log10(G2)); //dB
+
+G3=100;
+GG3=(10*log10(G3)); //dB
+
+F2=2; //dB
+F3=2; //dB
+
+FF2=(10^(F2/10));
+FF3=(10^(F3/10));
+
+F=(F1+((FF2-1)/G1)+((FF3-1)/(G1*GG2)));
+FF=(10*log10(F));
+disp('dB',FF,'Noise figure of cascade');
+
+//(b) SNR at output
+//Given
+Pin=-90; //dBm
+Pout=Pin-IL+GG2+GG3; //dBm
+
+//Pn=Gcas*K*Te*B (cascade)
+K=1.38D-23;
+To=290; //Kelvin
+B=1D+8;
+Gcas=GG2+GG3-IL;
+Gcas1=(10^(Gcas/10));
+Pn=K*To*(F-1)*B*Gcas1; //W
+
+Pn1=(10*(log10(Pn/1D-3)));
+disp('dBm',Pn1,'Noise power output:');
+
+SNR=Pout-Pn1;
+disp('dB',SNR,'Signal to Noise ratio:');
+
+//(c)Best Noise Figure
+//G1 after G2 after IL
+
+Fcas=(FF2+((FF3-1)/G3)+((IL1-1)/(G3*G2)));
+Fcas1=(10*(log10(Fcas)));
+
+disp('dB',Fcas1,'Noise figure will be:');