I am trying to develop a dsss (direct sequence spread spectrum) model on MATLAB, more precise i want to build code for BOC (binary offset carrier) modulation,used in GPS. The problem that i am facing has to do with the spectrum response that i am getting after doing fft in my signal.More accurate,the Fourier transform of it should be spread over a larger number of frequencies,although that i get is a simple Dirac response having nothing to do with that it should be shown. The initial signal (a binary stream (random numbers spanning from zero to one)) is multiplied by a higher frequency one (the code) and after that by a sub carrier in order to get a double sided spectrum.Instead of having a nice spread waveform i get that impulse mentioned above. I was told that i have to loop it up somehow in order to improve my plots... Any suggestions? Thank you very much for your reply. George
closed as not a real question by W5VO♦ Aug 1 '12 at 6:08
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