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.

Apps

BER Analyzer

分析位错误率（BER）通信系统的性能

系统对象

Measurements

`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

Visualization

`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 and measurement
`dsp.ArrayPlot`	Display vectors or arrays

Blocks

Measurements

Error Rate Calculation	Compute bit error rate or symbol error rate of input data
EVM Measurement	Measure error vector magnitude
MER Measurement	在数字调制应用中测量信号噪声比（SNR）

Visualization

Constellation Diagram	显示输入信号的星座图
Eye Diagram	Display eye diagram of time-domain signal
Time Scope	显示在模拟过程中生成的信号

Functions

Bit Error Rate Calculation and Estimation

`biterr`	计算位错误和位错误率（BER）的数量
`symerr`	计算符号错误和符号错误率的数量
`berawgn`	Bit error rate (BER) for uncoded AWGN channels
`bercoding`	编码AWGN通道的位错误率（BER）
`berconfint`	蒙特卡洛模拟的位错误率（BER）和置信区间
`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

Visualization

`scatterplot`	Generate scatter plot
`eyediagram`	生成眼图

Utilities

`Marcumq`	Generalized Marcum Q function
`noisebw`	Equivalent noise bandwidth of filter
`qfunc`	Q function
`qfuncinv`	Inverse Q function

Topics

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)), characterizespectral regrowth在一个通信系统组件,这样的as a modulator or an analog front end.

Error Vector Magnitude (EVM)

EVM Measurements

Scatter Plots and Constellation Diagrams

Generating scatter plots

可视化RF损伤

Apply various RF impairments to a QAM signal.

Plot Signal Constellations

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