RF Component Modeling
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
Impairments
fspl | Free space path loss |
frequencyOffset | Apply frequency offset to input signal (Since R2022a) |
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 (Since R2022b) |
Visualize Phase Noise Filter
plotPhaseNoiseFilter | Plot response of phase noise filter block |
Objects
Impairments and Components
comm.MemorylessNonlinearity | Apply memoryless nonlinearity to complex baseband signal |
comm.MultibandCombiner | Frequency-shift and combine signals (Since R2021b) |
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 (Since R2021b) |
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
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 (Since R2021b) |
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 (Since R2022b) |
Sample Rate Offset | Apply sample rate offset to input signal (Since R2022b) |
Impairment Corrections
AGC | Adaptively adjust gain for constant signal-level output |
Coarse Frequency Compensator | Compensate for carrier frequency offset in 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
- Top-Down Design of RF Receiver
Design an RF receiver for a ZigBee®-like application using a top-down methodology.
- Visualize RF Impairments
Apply various RF impairments to a QAM signal.
Featured Examples
ACS Test Waveform Generation for 5G NR Receiver Testing
Generate waveform for ACS receiver test, as defined in TS 38.141-1, Section 7.4.1.
(5G Toolbox)
- Since R2024b
Simulate and Verify Power Amplifier Backoff
Use backoff to scale a signal prior to inputting it to a table-based power amplifier.
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.
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.
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:
Adjacent and Co-Channel Interference
Use PSK-modulated signals to show the effects of adjacent and co-channel interference on a transmitted signal.
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.
Power Amplifier Characterization
Characterize a power amplifier using measured input and output signals of an NXP Airfast PA.
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.
Impact of RF Effects on Communication System Performance
Model thermal noise, phase noise, and nonlinearity impairments of an RF transceiver in Simulink®.
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).
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