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+//Exa 21.2
+// To find-
+//a) the hopping bandwidth,
+//b) What is the chip-rate,
+//c) How many chips are there in each data symbol,
+//d) What is the processing gain.
+
+clc;
+clear all;
+
+Stepsize=200; //in Hz
+Chipsmin=20;//length of linear feedback shift register 
+Datarate=1.2*10^3;  //bps
+
+//solution
+No_of_tones=2^Chipsmin;
+Bss=No_of_tones*Stepsize;
+Chiprate=Datarate*Chipsmin;
+Gp=Bss/Datarate;//processing gain
+Symbolrate=Datarate/3;  //8-ary FSK is used
+Chips_symbol=Chiprate/Symbolrate;
+printf('The Hopping Bandwidth is %.3f MHz\n',Bss/10^6);
+printf(' The chiprate is %d kchip/sec\n',Chiprate/10^3);
+printf(' Chips per symbol are %d \n',Chips_symbol);
+printf(' The processing gain is %.1f\n',Gp);