initial commit / add all books

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diff --git a/848/CH7/EX7.1/Example7_1.sce b/848/CH7/EX7.1/Example7_1.sce
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+//clear//

+//Caption: To find optimum decision threshold

+//Example7.1

+//Page 258

+clear;

+clc;

+close;

+bon = 1;

+boff =0;

+sigma_on = 1;

+sigma_off = 1;

+Q = (bon-boff)/(sigma_on+sigma_off)

+Vth = bon-Q*sigma_on

+disp(Q,'Q parameter value =')

+disp(Vth,'optimum decision threshold Vth =') 

+//Result

+//Q parameter value = 0.5  

+//optimum decision threshold Vth = 0.5  

diff --git a/848/CH7/EX7.2/Example7_2.sce b/848/CH7/EX7.2/Example7_2.sce
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+//clear//

+//Caption: To find out signal-to-noise ratio and probability of error for given 'Q'

+//Example7.2

+//Page 258

+clear;

+clc;

+close;

+Q = 6;

+Pe = (1/2)*(1-erf(Q/sqrt(2)));

+S_N_dB = 10*log10(2*Q);

+disp(Pe,'Probability of error Pe(Q) =')

+disp(S_N_dB,'Signal-to-noise ratio in dB S/N =') 

+//Result

+//Probability of error Pe(Q) = 9.866D-10  

+//Signal-to-noise ratio in dB S/N = 10.791812 

diff --git a/848/CH7/EX7.3/Example7_3.jpg b/848/CH7/EX7.3/Example7_3.jpg
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index 000000000..85b547f9f
--- /dev/null
+++ b/848/CH7/EX7.3/Example7_3.jpg
diff --git a/848/CH7/EX7.3/Example7_3.sce b/848/CH7/EX7.3/Example7_3.sce
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+//clear//

+//Caption:Plotting Bit-Error-Rate versus Q factor

+//Example7.3

+//page 259

+clear;

+clc;

+close;

+Q = 0:0.01:8;

+Pe = (1/2)*(1-erf(Q./sqrt(2)));

+a =gca();

+a.data_bounds =[0,1e-16;8,0.5];

+plot(Q,Pe,'r')

+xlabel('Q')

+ylabel('Pe')

+title('BER(Pe) versus the factor Q')

+disp(Pe(1),'Probability of error at Q =0')

+disp(Pe(101),'Probability of error at Q =1')

+disp(Pe(201),'Probability of error at Q =2')

+disp(Pe(301),'Probability of error at Q =3')

+disp(Pe(401),'Probability of error at Q =4')

+disp(Pe(501),'Probability of error at Q =5')

+disp(Pe(601),'Probability of error at Q =6')

+disp(Pe(701),'Probability of error at Q =7')

+disp(Pe(801),'Probability of error at Q =8')

+//Result

+//Probability of error at Q =0  

+//    0.5  

+//Probability of error at Q =1   

+//    0.1586553  

+//Probability of error at Q =2   

+//    0.0227501  

+//Probability of error at Q =3   

+//    0.0013499  

+//Probability of error at Q =4   

+//    0.0000317  

+//Probability of error at Q =5   

+//    0.0000003  

+//Probability of error at Q =6   

+//    9.866D-10  

+//Probability of error at Q =7   

+//    1.280D-12  

+//Probability of error at Q =8   

+//    6.106D-16  

diff --git a/848/CH7/EX7.4/Example7_4.sce b/848/CH7/EX7.4/Example7_4.sce
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+++ b/848/CH7/EX7.4/Example7_4.sce
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+//clear//

+//Caption: To find the energy of the photon incident on photodiode

+//and Minimum incident optical power

+//Example7.4

+//page 262

+clear;

+clc;

+close;

+h =  6.626e-34; //planks constant J/s

+C = 3e08; //free space velocity in m/s

+B = 10e06; //data rate 10 Mb/sec

+tuo = 2/B; //1/tuo = half the data rate B

+Lambda = 850e-09; //operating wavelength in nm

+E = 20.7*h*C/Lambda;

+Pi = E/tuo;

+disp(E,'Energy of the incident photon E =')

+disp(Pi,'minimum incident optical power Pi =')

+disp(10*log10(Pi*1000),'minimum incident optical power in dBm =')

+//Result

+// Energy of the incident photon E =  4.841D-18  

+// minimum incident optical power Pi = 2.420D-11  

+// minimum incident optical power in dBm =  - 76.161059