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diff --git a/3446/CH11/EX11.4/Ex11_4.sce b/3446/CH11/EX11.4/Ex11_4.sce
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+// Exa 11.4
+// To  calculate-
+//(a) data symbol transmitted per hop, and 
+//(b) the number of nonoverlapping hop frequencies.
+
+clc;
+clear all;
+
+R=120; //transmission rate in kbps
+Hop=2000; //per second
+Spectrum=10; //in MHz
+
+//solution
+//For 32-FSK
+Bits_sym=log2(32);
+SR=R/Bits_sym;
+printf('Bits per symbol are %d \n ',Bits_sym);
+printf('Hops per second are 2000 and Symbol rate is %d kbps\n ',SR);
+disp("Since the symbol rate is higher than the hop rate, the system is a slow FHSS system.");
+Sym_hop=SR*10^3/Hop;
+Min_BW=Sym_hop*SR;
+Nonoverlap_hop=Spectrum*10^3/Min_BW;
+disp("");
+printf(' Symbols transmitted per hop are %d \n ',Sym_hop);
+printf('Number of non-Overlapping hop frequencies are %d \n ',round(Nonoverlap_hop));