La traduction de cette page n'est pas à jour. Cliquez ici pour voir la dernière version en anglais.

Tests et mesures

Génération de formes d’onde, formats d’E/S de fichier, visualisation et analyse de performance

Générez des formes d’onde et utilisez des outils quantitatifs pour mesurer la performance du système. Utilisez des utilitaires graphiques comme le diagramme de constellation et le diagramme de l’œil pour visualiser les effets de différentes imperfections et corrections.

Les formats de fichiers supportés pour le traitement des signaux capturés comprennent les fichiers de signaux en bande de base binaires et les fichiers NI™ TDMS (Technical Data Management Solution). Il est possible de lire les données dans des tables ou des timetables en lisant individuellement chaque fichier TDMS ou en lisant simultanément des collections de fichiers TDMS.

Applications

Wireless Waveform Generator	Create, impair, visualize, and export modulated waveforms
Bit Error Rate Analysis	Analyze BER performance of communications systems

Fonctions

développer tout

Calcul et estimation du taux d’erreur binaire

`biterr`	Compute number of bit errors and bit error rate (BER)
`symerr`	Compute number of symbol errors and symbol error rate
`berawgn`	BER and SER for uncoded data over AWGN channels
`bercoding`	BER for coded AWGN channels
`berconfint`	Error probability estimate and confidence interval of Monte Carlo simulation
`berfading`	BER and SER for uncoded data over Rayleigh and Rician fading channels
`berfit`	Fit curve to nonsmooth empirical BER data
`bersync`	BER for imperfect synchronization
`semianalytic`	BER using semianalytic technique

Visualisation

`scatterplot`	Display input signal in IQ-plane
`eyediagram`	Generate eye diagram
`plotPhaseNoiseFilter`	Plot response of phase noise filter block

Utilitaires

`marcumq`	Generalized Marcum Q-function
`noisebw`	Equivalent noise bandwidth of digital lowpass filter
`qfunc`	Q function
`qfuncinv`	Inverse Q function
`showcommblockdatatypetable`	Communications Toolbox block characteristics

E/S de fichier

`tdmsread`	Read data from TDMS file (depuis R2022a)
`tdmswrite`	Write data to TDMS file (depuis R2022b)
`tdmsinfo`	Information about TDMS file (depuis R2022a)
`tdmsreadprop`	Read properties as single row table from TDMS file (depuis R2022a)
`tdmswriteprop`	Write properties to TDMS file (depuis R2022b)

Objets

développer tout

Mesures

`comm.ACPR`	Measure adjacent channel power ratio (ACPR)
`comm.ErrorRate`	Compute bit or symbol error rate of input data
`comm.EVM`	Measure error vector magnitude (EVM) of received signal
`comm.MER`	Measure modulation error ratio of received signal
`powermeter`	Measure power and CCDF of the power of voltage signal (depuis R2021a)

Visualisation

`comm.ConstellationDiagram`	Display and analyze input signals in IQ-plane
`spectrumAnalyzer`	Display frequency spectrum of time-domain signals (depuis R2022a)
`timescope`	Display time-domain signals (depuis R2020a)
`dsp.ArrayPlot`	Display vectors or arrays

E/S de fichier

`comm.BasebandFileReader`	Read baseband signal from file
`comm.BasebandFileWriter`	Write baseband signal to file
`vita49Reader`	VITA 49 file reader (depuis R2022b)
`tdmsDatastore`	Datastore for collection of TDMS files (depuis R2022a)

Blocs

développer tout

Mesures

Error Rate Calculation	Compute bit error rate or symbol error rate of input data
EVM Measurement	Measure error vector magnitude (EVM)
MER Measurement	Measure modulation error ratio in digital modulation applications
Power Meter	Measure power and the CCDF of the power of voltage signal in Simulink (depuis R2021a)

Visualisation

Constellation Diagram	Display and analyze input signals in IQ-plane
Eye Diagram	Display eye diagram of time-domain signal (depuis R2023b)
Time Scope	Display and analyze signals generated during simulation and log signal data to MATLAB
Spectrum Analyzer	Display frequency spectrum

Génération de formes d'onde

Waveform From Wireless Waveform Generator App

Wireless waveform source exported to Simulink (depuis R2021b)

E/S de fichier

Baseband File Writer	Write baseband signals to file
Baseband File Reader	Read baseband signals from file

Rubriques

Bit Error Rate Analysis Techniques
Obtain bit error rate results and statistics.
Analyze Performance with Bit Error Rate Analysis App
Learn how to use the Bit Error Rate Analysis app.
Calculer le BER pour un système QAM avec un canal AWGN en utilisant MATLAB

Les fonctionnalités de Communications Toolbox™ développées autour de l’outil de calcul et de visualisation MATLAB^® vous donnent accès à un plus haut niveau de simulations de systèmes de communications.
- ÉTAPE 1: Examiner la 16-QAM en utilisant MATLAB
- ÉTAPE 2: Utiliser la mise en forme d’impulsion sur un signal 16-QAM
- ÉTAPE 3: Utiliser la correction d’erreur sans voie de retour sur un signal 16-QAM
Create Waveforms Using Wireless Waveform Generator App
Create, impair, visualize, and export modulated waveforms.
ACPR Measurements Using WCDMA Signal
This example shows you how to obtain adjacent channel power ratio (ACPR) measurements using a WCDMA communications signal, according to the 3GPP™ TS 125.104 standard [1].
Measure Modulation Accuracy
Learn about EVM and MER for measuring modulation accuracy.
Scatter Plots and Constellation Diagrams
Display digitally modulated signals in the IQ-plane.
Visualize RF Impairments
Apply various RF impairments to a QAM signal.
Plot Signal Constellations
Show reference constellation plots for 16-PSK modulation of Gray-coded and binary-coded symbol mapping by setting PlotConstellation=true when using the modulation function.
VITA 49 Packet Format
Explore the signal data packet and context data packet format of VITA 49 file.
Selected Bibliography for Measurements
List of references for further reading.
Eye Diagram Analysis
In digital communications, an eye diagram provides a visual indication of how noise might impact system performance.

Informations connexes

The NI TDMS File Format
Datastore

Exemples présentés

Link Budget Analysis

Demonstrate analyze link budgets in the design of wireless communications links between two sites considering issues of range, throughput, and received signal quality of critical importance to the system engineer.

Ouvrir le live script

Measure EVM for 802.15.4 (ZigBee) System

Measure EVM of simulated IEEE 802.15.4 transmitter.

Ouvrir le live script

Frequency Offset Calibration for Receivers

At the receiver, measure and calibrate to remove the frequency offset between a transmitter and a receiver.

Ouvrir le script

Frequency Offset Calibration for Receivers in Simulink

Measure and calibrate for transmitter/receiver frequency offset at the receiver in a Simulink simulation.

Ouvrir le modèle

Spectrum Analysis of Signals

Downstream spectrum analysis of signals using MATLAB, Communications Toolbox and DSP System Toolbox™.

Ouvrir le live script

Spectrum Analysis of Signals in Simulink

Use the captured signals, or receive signals in real time using RTL-SDR, ADALM-PLUTO or USRP™ radio, as a data source for downstream spectrum analysis with MATLAB and Simulink^®.

Ouvrir le modèle

VITA 49 File Reader

Read signal time data packets and the associated metadata (context packet data) from a VITA 49.2 format file.

Ouvrir le live script