qpsk_mod.asv

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function [d] = qpsk_mod(b1,numbits)  % qpsk modulation
% 
% pairs of bits,b(i),b(i+1)are mapped to complex-valued modulation symbols d_symb=Re+j*Im 
% modulation scheme:   b(i) b(i+1)|     Re     |   Im
%                       0     0   | 1/sqrt(2)  |   1/sqrt(2)
%                       0     1   | 1/sqrt(2)  |  -1/sqrt(2)
%                       1     0   | -1/sqrt(2) |   1/sqrt(2)
%                       1     1   | -1/sqrt(2) |  -1/sqrt(2)

 for n = 1:2:numbits     
% switch b1(n)
    % case 0
   %  Re(n) = 1/sqrt(2); 
   %  case 1
   %  Re(n) = -1/sqrt(2);
% end
% switch b1(n + 1)
    % case 0
    % Im(n) = 1/sqrt(2);
    % case 1
    % Im(n) = -1/sqrt(2);
% end
Re(n)=if1or0(b1(n))
Im(n)=if1or0(b1(n+1))
d(floor(n / 2) + 1) = Re(n) + j * Im(n);

end