kringo
Newbie level 6
Hello everyone,
i have a problem with 16QAM transmission policy
I think my problem is that I don´t understand correctly the transmission of 16QAM. I am currently working on a 16QAM transmission in Matlab and have made nearly everything on the Transmitter side.
So I generated a bit stream, seperated in I and Q stream and assigned amplitudes. Afterwards I convoluted this stream with a root raised cosine filter and multiplied this signal with a cosine / sine and added it like this:
x_b = xI*cos(2*pi*f*T)+j*xQ*sin(2*pi*f*T)
whereas:
xb = Basebandsignal
xI = Inphase component
xQ = Quadrature component
So my question now is: How can I modulate this basebandsignal on a carrier frequency so I can transmit it over a speaker or on even higher frequencies in optical fibers? I cannot transmit a complex valued signal ...
Thanks for your help
i have a problem with 16QAM transmission policy
I think my problem is that I don´t understand correctly the transmission of 16QAM. I am currently working on a 16QAM transmission in Matlab and have made nearly everything on the Transmitter side.
So I generated a bit stream, seperated in I and Q stream and assigned amplitudes. Afterwards I convoluted this stream with a root raised cosine filter and multiplied this signal with a cosine / sine and added it like this:
x_b = xI*cos(2*pi*f*T)+j*xQ*sin(2*pi*f*T)
whereas:
xb = Basebandsignal
xI = Inphase component
xQ = Quadrature component
So my question now is: How can I modulate this basebandsignal on a carrier frequency so I can transmit it over a speaker or on even higher frequencies in optical fibers? I cannot transmit a complex valued signal ...
Thanks for your help