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Measurements, Visualization, and Analysis

Graphical and quantitative analysis

Communications System 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 Analyzer Analyze bit error rate (BER) performance of communications systems

System Objects

comm.ACPR Adjacent Channel Power Ratio measurements
comm.CCDF Measure complementary cumulative distribution function
comm.ErrorRate Compute bit or symbol error rate of input data
comm.EVM Measure error vector magnitude
comm.MER Measure modulation error ratio
comm.ConstellationDiagram Display a constellation diagram for input signals
comm.EyeDiagram Display eye diagram of time-domain signals
dsp.SpectrumAnalyzer Display frequency spectrum of time-domain signals
dsp.TimeScope Time domain signal display
dsp.ArrayPlot Display vectors or arrays


Error Rate Calculation Compute bit error rate or symbol error rate of input data
EVM Measurement Measure error vector magnitude
MER Measurement Measure signal-to-noise ratio (SNR) in digital modulation applications
Constellation Diagram Display constellation diagram for input signals
Eye Diagram Display eye diagram of time-domain signal
Time Scope Display time-domain signals


biterr Compute number of bit errors and bit error rate (BER)
symerr Compute number of symbol errors and symbol error rate
berawgn Bit error rate (BER) for uncoded AWGN channels
bercoding Bit error rate (BER) for coded AWGN channels
berconfint Bit error rate (BER) and confidence interval of Monte Carlo simulation
berfading Bit error rate (BER) for Rayleigh and Rician fading channels
berfit Fit curve to nonsmooth empirical bit error rate (BER) data
bersync Bit error rate (BER) for imperfect synchronization
semianalytic Calculate bit error rate (BER) using semianalytic technique
commtest.ErrorRate Create error rate test console
scatterplot Generate scatter plot
eyediagram Generate eye diagram
marcumq Generalized Marcum Q function
noisebw Equivalent noise bandwidth of filter
qfunc Q function
qfuncinv Inverse Q function


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.

Featured Examples

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