Physical Interpretation of Simulink SignalsThe Inport block allows you to specify the complex envelopes of your input
signals and import them as RF signals for multi-carrier simulation.
The power option automatically insert a source or load impedance in your
network, and normalizes the signal power with respect to the specified
impedance. You do not need to manually insert source and load terminations, and
your signals are automatically scaled between RF Blockset and the Simulink
environment that assumes an implicit 1 Ohm reference impedance.
When using voltage sources and sensors, manually add source and load
terminations, otherwise there might be an undesired impedance mismatch in your
network. When you measure the power of a voltage signal, make sure that you use
a 50Ohm reference impedance.
If you use an ideal voltage source and add a source impedance, in perfectly
matched conditions, the actual voltage applied to the first block of the RF
chain is half of the value of the input Simulink signal. The source impedance
and the input impedance of the first block of the RF chain form a voltage
divider network.
Implicit Carrier for Complex Equivalent Baseband SignalInput signal is a digital communication complex equivalent baseband signal
(I,Q). You assume an implicit carrier for the system that is equal to the
carrier frequency, Fc
. You want to
model RF effects such as amplifier nonlinearity and S-parameter filters using
RF Blockset:
Enter Fc
in the
Carrier Frequencies parameter.
The simulation step size in the configuration block is the same as
the sample time of the Simulink input signal, and it is not related
to the carrier frequency.
If the RF chain does not include any modulator or demodulator, use
an Outport block at the
end of the chain. You can use the Outport
block
to probe the complex equivalent signal centered on
Fc
.
No Carrier for Baseband SignalInput signal is a digital communication complex input baseband signal (I,Q).
You assume that no carrier is associated with the input signal. You want to
upconvert the signal to Fc
and model
RF effects such as amplifier nonlinearity and S-parameter filters:
Use to two Inport blocks for the I and Q components
of the input signal. Set the Carrier
Frequencies parameter of each Inport
block to 0
To upconvert the signal, use an IQ Modulator block. Set
the Local oscillator frequency to
Fc
.
The simulation step size in the configuration block is the same as
the sample time of the Simulink input signal, and it is not related
to the Local Oscillator frequency.
Use an Outport block at the
end of the chain. and probe the signal at
Fc
.
Upconvert Signal to IF and Then RFInput signal is a digital communication complex equivalent baseband signal
(I,Q). You want to first upconvert the signal to intermediate frequency (IF),
then to RF, and model RF imperfections:
Set the Carrier Frequencies parameter of each
Inport block to IF
.
Use the Mixer block. Set the LO
carrier frequency to RF-IF
.
Use an Outport block at the
end of the chain. and probe the signal at RF.
Real Passband SignalInput signal is a digital or analog real passband signal that is explicitly
modulated to high frequency in Simulink domain:
Set the Carrier Frequencies parameter of each
Inport block to 0
and simulate
RF effects.
The simulation step size in the configuration block is the same as
the sample time of the Simulink input signal, and it is proportional
to the RF frequency.
However there is no speed benefit in using RF Blockset for
real-passband simulation. This option is not recommended