SimRF

Simulating Wireless Systems Using SimRF

At a higher level of abstraction, you can model a chain of RF components using blocks from the Equivalent Baseband library. You can perform link-budget analysis and simulation of your system, including RF impairments such as noise and odd-order nonlinearity.

If you use blocks from the Equivalent Baseband library, the simulation is performed using a baseband equivalent model of the RF chain. This enables single-carrier simulation of super heterodyne transceivers, taking into account in-band spectral regrowth, noise, and impedance mismatches among blocks.

At a lower level of abstraction, blocks from the Circuit Envelope library let you model arbitrary topologies and examine alternative architectures for your RF system. The probing capabilities of SimRF enable you to track the effects of the RF impairments through the model.

If you use blocks from the Circuit Envelope library, the signals in these SimRF models are represented as voltages and currents. You can generate signals in Simulink and pass them to SimRF using the input port, or generate them using SimRF sources. Each signal is associated with a carrier frequency. The set of all carrier frequencies simulated in a SimRF model is defined in the Configuration block. To capture the relevant spectral content of the signals, you can select the total number of harmonics used for simulation, or the solver can determine it automatically.

SimRF integrates with Simscape for modeling the low-frequency analog electronics chain.

The set of RF impairments you can model in SimRF includes:

  • Noise
  • Even-order and odd-order intermodulation distortion due to in-band or out-of-band signals
  • Spurious signals
  • Image effects due to mixing products
  • Phase offsets
  • I/Q mismatches
  • DC conversion
  • DC offset
  • Local oscillator phase noise
Circuit envelope model of a low-IF receiver, including an active analog polyphase filter modeled in Simscape.
Circuit envelope model of a low-IF receiver, including an active analog polyphase filter modeled in Simscape. Impairments analyzed in this model include interference, even-order and odd-order intermodulation distortion, image effects, I/Q mismatches, and local oscillator phase noise.

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Design and Verify RF Transceivers for Wireless Communication

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