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Antenna and propagation models simulate the effects of radio channel on the transmitted signal. These effects include signal fading and pathloss. Both antenna and propagation channel models are TSDF components with input and output timed signals.
Antenna models are identified by their coordinate and gain. For mobile antennas, the velocity vector is also included in the parameters. The input of antennas are multi to provide flexibility of adding the contribution from various noise or fading channels. The propagation channel models are typically identified by the type of fading, the specification of power delay profile, and whether pathloss is to be activated.
The input as well as output impedance of antennas and channel models are left as infinite and zero, respectively. For the inclusion of antenna impedance, cosimulation with Circuit Envelope is recommended (for details, refer to “Introduction: Circuit Cosimulation Components). In this application, S-parameter block representing measurement (file), functions or impedance components can be placed on the circuit schematic page and co-simulated with signal processing designs. To access an example that demonstrates this: from the Main window, choose File > Example Project > Antennas-Prop > RadioChannel_prj; from the Schematic window, choose File > Open Design, ANTLOAD.dsn.
The separate specification of antennas and (propagation) channel components is to provide a more intuitive and flexible use model. During the simulation, the effects of both antenna and channel models are merged and the combined antenna and propagation channel components are replaced with equivalent models in the pre-processing phase of the simulation.