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+// Exa 3.8
+// TO find coverage radius of an access point.
+
+clc;
+clear all;
+
+SNRmin=12;//in dB
+n=3; //No of floors
+Backgroundnoise=-115; //dBm
+pt=100  //in dBm
+
+//solution
+pt_db=10*log10(pt);
+Sr=Backgroundnoise+SNRmin; //receiver sensitivity
+Lpmax=pt_db-Sr;
+//Refering table 3.4
+Lp_d0=38;  //ref path loss at the first meter(dB)
+Lf=15+4*(n-1); //signal attenuation through n floors
+y=3; //path loss exponent
+X=10; //Shadowing effect(dB)
+d=10^((Lpmax-Lp_d0-Lf-X)/30); //max allowable path loss
+printf('Coverage radius of an access point = %d m \n',round(d));