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+//Page Number: 8.6
+//Example 8.1
+
+clc;
+disp('Part a');
+//(a)Given, u1=1W and u2=1mW
+//Change to dBW and dBm
+u1=1D-3;
+u2=1;
+//(i)470mW
+a=470D-3;
+y1=(10*log10(a/u1));
+disp('dBm',y1);
+
+y2=(10*log10(a/u2));
+disp('dBW',y2);
+
+//(ii)1W
+b=1;
+z1=(10*log10(b/u1));
+disp('dBm',z1);
+
+z2=(10*log10(b/u2));
+disp('dBW',z2);
+
+//(iii)100nW
+c=100D-9;
+x1=(10*log10(c/u1));
+disp('dBm',x1);
+
+x2=(10*log10(c/u2));
+disp('dBW',x2);
+
+disp('Part B');
+//(b)Here u1=1W (for dBW)and u2=1mW (for dBm)
+//Change to powers to watts
+//(i)-20dBW
+a=-20;
+k1=u2*(10^(a/10));
+disp('W',k1);
+
+
+//(ii)47dBm
+b=47;
+k2=u1*(10^(b/10));
+disp('W',k2);
+
+
+//(ii)0dBm
+c=0;
+k3=u1*(10^(c/10));
+disp('W',k3);
+
+
+disp('Part C');
+//(c)Given, channel loss=20dB and Pt=1W
+l=-20;
+PT=1;
+PR=10^(l/10);
+disp(PR,'W','Received Power',);
+
+disp('Part D');
+//(d)Given, channel loss=30dB when signal=3dB and overall loss=20dB
+l1=-30;
+s=-3;
+l2=-20;
+q=-l1-s-s+l2;
+d1=10^(q/10);
+disp('dB',q,'=');
+disp(d1);
+
+disp('Part E');
+//(e)Given,
+Si=0; //dBm
+S1=1D-3*(10^(Si/10));
+Ni=1D-7; //W
+
+Osnr=S1/Ni;
+Odb=(10*(log10(Osnr)));
+disp('dB',Odb);