I have a simulink model of zigbee over a Rayleigh fading channel.
The modulation in the transmitter part is O-QPSK modulated baseband.
Most of the examples didn't add the RF frequency after the baseband modulator and I can't understand why.
And what is the effect of cancelling this part in simulink?
However, when I try to simulate the RF band after baseband modulator using up converter, the output of it was real and the Rayleigh multipath fading block didn't accept it.