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a guest May 26th, 2019 72 Never
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  1. %Question 1 - BPSK
  2. x = 0:9;
  3. message='SnirTomer';
  4. S0=ones(1,10);
  5. S1=-S0;
  6.  
  7. subplot(2,2,1);
  8. stem(x, S0);
  9. binary_message=dec2bin(message);
  10. binary_message=[binary_message(1,:) binary_message(2,:) binary_message(3,:) binary_message(4,:) binary_message(5,:) binary_message(6,:) binary_message(7,:) binary_message(8,:) binary_message(9,:)];
  11. N = length(S0);
  12. before_noise = zeros(1,10);
  13. for i=1:N
  14.    
  15.    if binary_message(i)-48 == 0
  16.        before_noise(i) = S0(i);
  17.    else
  18.        before_noise(i) = S1(i);
  19.    end
  20. end
  21.  
  22. subplot(2,2,2);
  23. stem(x, before_noise);
  24.  
  25. sd=15484; %15484 just for example
  26. s=rng(sd);
  27.  
  28. for i=1:N
  29.     temp = mod(randn(1,1),1);
  30.     rf_signal(i) = before_noise(i) + temp;
  31.  
  32. end
  33.  
  34. subplot(2,2,3);
  35. stem(x, rf_signal);
  36.  
  37.  
  38. positive = zeros(1, 10);
  39. negative = zeros(1, 10);
  40.  
  41. for i=1:N
  42.    
  43.     temp = rf_signal(i);
  44.     if temp > 0
  45.         positive(i) = temp;
  46.     else
  47.         negative(i) = temp;
  48.     end
  49. end
  50.  
  51.  
  52. subplot(2,2,4);
  53. stem(x, positive, 'green')
  54. hold on
  55. stem(x, negative, 'red')
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