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Measurements, Visualization, and Analysis

Graphical and quantitative analysis

Communications Toolbox™ provides quantitative tools for measuring system performance. Use graphical utilities such as constellation and eye diagrams to visualize the effects of various impairments and corrections.


BER AnalyzerAnalyze bit error rate (BER) performance of communications systems
Wireless Waveform GeneratorCreate, impair, visualize, and export modulated waveforms


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biterrCompute number of bit errors and bit error rate (BER)
symerrCompute number of symbol errors and symbol error rate
berawgnBit error rate (BER) for uncoded AWGN channels
bercodingBit error rate (BER) for coded AWGN channels
berconfintBit error rate (BER) and confidence interval of Monte Carlo simulation
berfadingBit error rate (BER) for Rayleigh and Rician fading channels
berfitFit curve to nonsmooth empirical bit error rate (BER) data
bersyncBit error rate (BER) for imperfect synchronization
semianalyticCalculate bit error rate (BER) using semianalytic technique
commtest.ErrorRateCreate error rate test console
scatterplotGenerate scatter plot
eyediagramGenerate eye diagram
marcumqGeneralized Marcum Q function
noisebwEquivalent noise bandwidth of filter
qfuncQ function
qfuncinvInverse Q function

System Objects

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comm.ACPRAdjacent Channel Power Ratio measurements
comm.CCDFMeasure complementary cumulative distribution function
comm.ErrorRateCompute bit or symbol error rate of input data
comm.EVMMeasure error vector magnitude
comm.MERMeasure modulation error ratio
comm.ConstellationDiagramDisplay constellation diagram for input signals
comm.EyeDiagramDisplay eye diagram of time-domain signals
dsp.SpectrumAnalyzerDisplay frequency spectrum of time-domain signals
dsp.TimeScopeTime domain signal display and measurement
dsp.ArrayPlotDisplay vectors or arrays


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Error Rate CalculationCompute bit error rate or symbol error rate of input data
EVM MeasurementMeasure error vector magnitude
MER MeasurementMeasure signal-to-noise ratio (SNR) in digital modulation applications
Constellation DiagramDisplay constellation diagram for input signals
Eye DiagramDisplay eye diagram of time-domain signal
Time ScopeDisplay and analyze signals generated during simulation and log signal data to MATLAB
Spectrum AnalyzerDisplay frequency spectrum


Bit Error Rate (BER)

Obtain numerical evaluation results

Adjacent Channel Power Ratio (ACPR)

Adjacent channel power ratio (ACPR) calculations (also known as adjacent channel leakage ratio (ACLR)), characterize spectral regrowth in a communications system component, such as a modulator or an analog front end.

Error Vector Magnitude (EVM)

EVM Measurements

Scatter Plots and Constellation Diagrams

Generating scatter plots

Visualize RF Impairments

Apply various RF impairments to a QAM signal.

Plot Signal Constellations

This example shows how to plot a PSK constellation having 16 points.

Selected Bibliography for Measurements

List of references for further reading

Featured Examples