AnalogAroma wrote on Feb 6th, 2009, 6:10am:I have been experiencing some problems to model a RF transceiver in Simulink.
My baseband signal has a BW of 4MHz. But when I upconvert this signal at 1GHz , the shifted baseband signal spectrum seems very strange !!
Show me your block diagram of Simulink and resulting Spectrum.
How to model upconverter in Simulink ?
Just simply multiplier ? Or using Mixer in RF block set ?
Which of model in the followings do you use ?
(1)BB-Signal, I(t)+j*Q(t) ---> Real RF Signal, (I(t)+j*Q(t))*exp(j*omega0*t)
(2)BB-Signal, I(t)+j*Q(t) ---> Equivalent Lowpass Representation of RF Signal, {I(t)+j*Q(t), omega0}
What solver do you use in Simulink ?
Continuous or Discrete ?
What time step control do you use ?
If you use (1), time step is enough small ?