RF Component Modeling

Behavioral RF radio modeling and impairment correction

Apply RF impairments and corrections. Model RF front-end designs containing amplifiers, mixers, and digital predistortion (DPD).

Apps

Wireless Waveform Generator

Create, impair, visualize, and export modulated waveforms

Functions

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Impairments

`fspl`	Free space path loss
`frequencyOffset`	Apply frequency offset to input signal
`iqimbal`	Apply I/Q imbalance to input signal
`iqcoef2imbal`	Convert compensator coefficient to amplitude and phase imbalance
`iqimbal2coef`	Convert I/Q imbalance to compensator coefficient
`srmdelay`	Compute delay introduced by Sample-Rate Match block

Visualize Phase Noise Filter

plotPhaseNoiseFilter Plot response of phase noise filter block

Objects

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Impairments and Components

`comm.MemorylessNonlinearity`	Apply memoryless nonlinearity to complex baseband signal
`comm.MultibandCombiner`	Frequency-shift and combine signals
`comm.PhaseFrequencyOffset`	Apply phase and frequency offsets to input signal
`comm.PhaseNoise`	Apply phase noise to baseband signal
`comm.SampleRateOffset`	Apply sample rate offset to signal
`comm.ThermalNoise`	Add thermal noise to signal

Impairment Corrections

`comm.AGC`	Adaptively adjust gain for constant signal level output
`comm.CoarseFrequencyCompensator`	Compensate for frequency offset of PAM, PSK, or QAM signal
`dsp.DCBlocker`	Block DC component (offset) from input signal
`comm.DPD`	Digital predistorter
`comm.DPDCoefficientEstimator`	Estimate memory-polynomial coefficients for digital predistortion
`comm.IQImbalanceCompensator`	Compensate for IQ imbalance

Blocks

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Impairments and Components

Complex Phase Difference	Phase difference between two complex signals
Complex Phase Shift	Apply complex phase shift to complex signal
Free Space Path Loss	Apply free space path loss to complex signal
I/Q Imbalance	Apply I/Q imbalances to complex signal
Memoryless Nonlinearity	Apply amplifier models to complex baseband signal
Multiband Combiner	Frequency-shift and combine signals
Phase/Frequency Offset	Apply phase and frequency offsets to complex baseband signal
Phase Noise	Apply receiver phase noise to complex baseband signal
Receiver Thermal Noise	Apply receiver thermal noise to complex signal
Sample-Rate Match	Upsample two signals to common rate
Sample Rate Offset	Apply sample rate offset to input signal

Impairment Corrections

AGC	Adaptively adjust gain for constant signal-level output
Coarse Frequency Compensator	Compensate for carrier frequency offset for PAM, PSK, or QAM
DC Blocker	Block DC component
DPD	Digital predistorter
DPD Coefficient Estimator	Estimate memory-polynomial coefficients for digital predistortion
I/Q Compensator Coefficient to Imbalance	Convert compensator coefficient into amplitude and phase imbalance
I/Q Imbalance Compensator	Compensate for imbalance between in-phase and quadrature components
I/Q Imbalance to Compensator Coefficient	Converts amplitude and phase imbalance into I/Q compensator coefficient

Utilities

Complex Phase Difference	Phase difference between two complex signals
Complex Phase Shift	Apply complex phase shift to complex signal

Topics

Visualize RF Impairments
Apply various RF impairments to a QAM signal.

Featured Examples

Simulate and Verify Power Amplifier Backoff

Use backoff to scale a signal prior to inputting it to a table-based power amplifier.

Open Live Script

Top-Down Design of an RF Receiver

Designs an RF receiver for a ZigBee®-like application using a top-down methodology. It verifies the BER of an impairment-free design, then analyzes BER performance after the addition of impairment models. The example uses the RF Budget Analyzer App to rank the elements contributing to the noise and nonlinearity budget.

Open Script

RF Noise Modeling

Use the RF Blockset™ Circuit Envelope library to simulate noise and calculate noise power. Results are compared against theoretical calculations and a Communications Toolbox™ reference model.

Open Model

Impact of Thermal Noise on Communication System Performance

Use the RF Blockset™ Circuit Envelope library to model thermal noise in a super-heterodyne RF receiver and measure its effects on a communications system noise figure (NF) and bit error rate (BER). A Communications Toolbox™ reference model with parameters computed using Friis equations and a RF Blockset Noise Testbench are used to verify the results.

Open Model

Architectural Design of a Low IF Receiver System

Use the RF Blockset™ Circuit Envelope library to simulate the performance of a Low IF architecture with the following RF impairments: Component noise

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Adjacent and Co-Channel Interference

Use PSK-modulated signals to show the effects of adjacent and co-channel interference on a transmitted signal.

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OSTBC Transmission with Antenna Coupling

Simulate the effects of antenna mutual coupling on the performance of an orthogonal space-time block code (OSTBC) transmission over a multiple-input multiple-output (MIMO) channel.

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Power Amplifier Characterization

Characterize a power amplifier using measured input and output signals of an NXP Airfast PA.

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Digital Predistortion to Compensate for Power Amplifier Nonlinearities

Use digital predistortion (DPD) in a transmitter to offset the effects of nonlinearities in a power amplifier. This example use power amplifier models that were obtained from Power Amplifier Characterization example to simulate two cases. In the first simulation, the RF transmitter sends two tones. In the second simulation, the RF transmitter sends a 5G-like OFDM waveform with 100 MHz bandwidth.

Open Script

Impact of RF Effects on Communication System Performance

Model thermal noise, phase noise, and nonlinearity impairments of an RF transceiver in Simulink^®.

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Effect of a High-Power Interferer on ADC Performance

Effect of a high-power in-band or out-of-band interferer on the performance of a communications system with an analog-to-digital converter (ADC).

Open Script