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+// Exa 3.5
+// To calculate coherence time, coherence bandwidth, type of Symbol distortion and type of fading.
+
+clc;
+clear all;
+
+v=60*0.44704;  //.. mph to mps
+fc=860*10^6;//in Hz
+td=2*10^-6; //RMS delay spread in sec
+c=3*10^8;// speed of light in m/sec
+Rs=19200; //Coded symbol rate in bps
+
+//solution
+lamda=c/fc;
+fm=v/lamda; //Maximum doppler shift
+tc=1/(2*%pi*fm);//Channel coherence time
+printf('Channel coherence time is %.4f sec \n',tc);
+ts=1/Rs; //symbol interval
+printf(' Symbol interval is %d microsec \n',ts*10^6);
+disp(" As the symbol interval is much smaller compared to the channel coherence time. So, Symbol distortion is minimal and fading is slow.");
+disp("");
+Bc=1/(2*%pi*td);
+printf('  Coherence Bandwidth is %.2f kHz \n',Bc/1000)
+
+
+
+