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+clc;
+//page no 538
+//prob no. 15.2.1
+// satellite communication system is given 
+ht=36000;//height of satellite in km
+f=4000;//freq used in MHz
+Gt=15;//transmitting antenna gain
+Gr=45;//receiving antenna gain
+// A) Determination of free-space transmission loss
+L=32.5+20*log10(ht)+20*log10(f);
+disp('dB',L,'The free-space transmission loss is');
+// B) Determination of received power Pr
+Pt=200;//transmitted power in watt
+Pr_Pt=Gt+Gr-L;//power ration in dB
+Pr_Pt_watt=10^(Pr_Pt/10);//power ratio in watts
+//Therefore
+Pr=Pt*Pr_Pt_watt;
+disp('watts',Pr,'The received power');
+\ No newline at end of file