I think you are confused because you're doing the math on paper with
real sin/cos functions. The complex signal sources produce complex
oscillations ($s_f(t)=e^{j2\pi f t}$), which do not have symmetrical
spectrum.
Do the math with the exponential function; it get's easier than what you
have to do to prove the real intermodulation signals, and you clearly
see that $s_a s_b = s_{a+b}$.Greetings, Marcus On 08.05.2014 10:40, ali hanif wrote: > Can you plz explain Martin or give me a link atleast...thnx in advance > > > On Thu, May 8, 2014 at 1:19 PM, Martin Braun <martin.br...@ettus.com> wrote: > >> On 08.05.2014 08:59, ali hanif wrote: >> >>> When we multiply two complex signals in GNU Radio companion and see the >>> result using WX FFT block then there is no frequency difference >>> component(f1-f2) but only the addition component(f1+f2)...why is that?? >>> >> >> That is actually the mathematically correct thing. >> >> M >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
