Re: [Discuss-gnuradio] Multiplication of complex signals in GRC

[Marcus Müller]

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 <address@hidden> 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
>>
>>
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