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Test und Messung

Wellenform-Generierung, Datei-E/A-Formate, Visualisierung und Leistungsanalyse

Generieren Sie Wellenformen und verwenden Sie quantitative Tools zur Messung der Systemleistung. Verwenden Sie grafische Hilfsprogramme wie Konstellations- und Augendiagramme zur Visualisierung der Effekte verschiedener Störungen und Korrekturen.

Die unterstützten Dateiformate zur Verarbeitung erfasster Signale umfassen binäre Basisband-Signalformate und NI™ TDMS-Formate (Technical Data Management Solution). Sie können Daten in Tabellen oder Timetables übertragen, indem Sie TDMS-Dateien einzeln oder Sammlungen an TDMS-Dateien simultan auslesen.

Apps

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

Funktionen

alle erweitern

Bitfehlerraten-Berechnung und -Schätzung

`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

Visualisierung

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

Hilfsprogramme

`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

Datei-E/A

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

Objekte

alle erweitern

Messungen

`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 (Seit R2021a)

Visualisierung

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

Datei-E/A

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

Blöcke

alle erweitern

Messungen

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 (Seit R2021a)

Visualisierung

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

Wellenform-Generierung

Waveform From Wireless Waveform Generator App

Wireless waveform source exported to Simulink (Seit R2021b)

Datei-E/A

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

Themen

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.
BER für QAM-System mit AWGN mithilfe von MATLAB berechnen

Die Funktionen der Communications Toolbox™ basieren auf den Berechnungs- und Visualisierungstools von MATLAB^®.
- SCHRITT 1: 16-QAM mithilfe von MATLAB untersuchen
- SCHRITT 2: Impulsformung bei einem 16-QAM-Signal verwenden
- SCHRITT 3: Vorwärtsfehlerkorrektur bei einem 16-QAM-Signal verwenden
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.

Enthaltene Beispiele

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.

Live Script öffnen

Measure EVM for 802.15.4 (ZigBee) System

Measure EVM of simulated IEEE 802.15.4 transmitter.

Live Script öffnen

Frequency Offset Calibration for Receivers

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

Script öffnen

Frequency Offset Calibration for Receivers in Simulink

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

Modell öffnen

Spectrum Analysis of Signals

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

Live Script öffnen

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^®.