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+// Example no 5.5
+// To calculate mean excess delay, rms delay spread and maximum excess delay 
+// Page no. 202
+
+clc;
+clear all;
+
+// Given data
+t10dB=5*10^-6;                                                         // By definition of maximum excess delay (10dB)
+t1=0;                                                                  // Excess delay of first signal in seconds
+a1=-20;                                                                // Power level of first signal in dB
+t2=1*10^-6;                                                            // Excess delay of second signal in seconds
+a2=-10;                                                                // Power level of second signal in dB
+t3=2*10^-6;                                                            // Excess delay of third signal in seconds
+a3=-10;                                                                // Power level of third signal in dB
+t4=5*10^-6;                                                            // Excess delay of fourth signal in seconds
+a4=0;                                                                  // Power level of fourth signal in dB
+a1=10^(a1/10);                                                         // Power level of first signal in Watt
+a2=10^(a2/10);                                                         // Power level of second signal in Watt
+a3=10^(a3/10);                                                         // Power level of third signal in Watt
+a4=10^(a4/10);                                                         // Power level of fourth signal in Watt
+
+// Mean excess delay
+t=((a1*t1+a2*t2+a3*t3+a4*t4)/(a1+a2+a3+a4));                          // Mean excess delay in seconds
+tsquare=((a1*t1^2+a2*t2^2+a3*t3^2+a4*t4^2)/(a1+a2+a3+a4));            // Mean square excess delay
+
+// RMS delay spread
+sigmat=sqrt(tsquare-t^2);                                            // RMS delay spread
+
+// Coherence bandwidth
+Bc=1/(5*sigmat);                                                     // 50% Coherence bandwidth
+// The answer is varrying due to round-off error
+
+// Displaying the result in command window
+printf('\n The maximum excess delay (10 dB) = %0.0f microsecond',t10dB*10^6);
+printf('\n The mean excess delay = %0.2f microsecond',t*10^6);
+printf('\n The RMS delay spread = %0.2f microsecond',sigmat*10^6);
+printf('\n The coherence bandwidth = %0.0f KHz',Bc*10^-3);
+printf('\n Since coherence bandwidth is greater than 30 KHz, AMPS will work without an equalizer. However, GSM requires 200 KHz bandwidth which exceeds coherence bandwidth,\n thus an equalizer would be needed for this channel');