Documentation

Measurements, Visualization, and Analysis

Graphical and quantitative analysis

Communications Toolbox™提供了用于测量系统性能的定量工具。使用图形公用事业（例如星座和眼图）可视化各种障碍和校正的影响。

Apps

Wireless Waveform Generator Create, impair, visualize, and export modulated waveforms
BER Analyzer 分析位错误率（BER）通信系统的性能

Functions

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biterr Number of bit errors and bit error rate (BER)
symerr 计算符号错误和符号错误率的数量
berawgn 未编码AWGN频道的位错误率（BER）
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 拟合曲线与非平滑经验位错误率（BER）数据
Bersync Bit error rate (BER) for imperfect synchronization
semianalytic Calculate bit error rate (BER) using semianalytic technique
scatterplot Generate scatter plot
eyediagram 生成眼图
plotPhaseNoiseFilter Plot response of phase noise filter block
Marcumq Generalized Marcum Q function
noisebw Equivalent noise bandwidth of filter
qfunc Q function
qfuncinv Inverse Q function
showcommblockdatatypetable Communications Toolbox block characteristics

Objects

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comm.ACPR Adjacent Channel Power Ratio measurements
comm.ccdf 测量互补累积分布函数
通讯 Compute bit or symbol error rate of input data
comm.EVM Measure error vector magnitude
comm.MER Measure modulation error ratio
comm.constellationdiagram 显示输入信号的星座图
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

块

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Error Rate Calculation Compute bit error rate or symbol error rate of input data
EVM Measurement Measure error vector magnitude
MER测量 测量数字调制应用中的信号噪声比（SNR）
星座图 显示输入信号的星座图
Eye Diagram Display eye diagram of time-domain signal
Time Scope Display and analyze signals generated during simulation and log signal data to MATLAB
Spectrum Analyzer Display frequency spectrum

Topics

Bit Error Rate (BER)

Obtain numerical evaluation results.

Adjacent Channel Power Ratio (ACPR)

相邻通道功率比（ACPR）计算（也称为相邻通道泄漏比（ACLR）），表征spectral 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

将各种RF损伤应用于QAM信号。

情节信号星座

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

Selected Bibliography for Measurements

List of references for further reading.

Featured Examples

Modulation Classification with Deep Learning

Modulation Classification with Deep Learning

Use a convolutional neural network (CNN) for modulation classification. You generate synthetic, channel-impaired waveforms. Using the generated waveforms as training data, you train a CNN for modulation classification. You then test the CNN with software-defined radio (SDR) hardware and over-the-air signals.
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Link Budget Analysis

Link Budget Analysis

在两个站点之间的无线通信链接的设计中，范围，吞吐量和接收的信号质量对系统工程师至关重要。链接预算分析说明了通信链接中的所有收益和损失。某些因素和设计选择，例如传播路径长度，信号极化和天线进料电缆，降低信号质量，而其他因素（例如功率放大器和天线尺寸）可以提高传输信号强度。
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Eye and Constellation Diagram

Eye and Constellation Diagram

在分析通信系统中使用comm.eyediagram和comm.constellationdiagram。
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Eye Diagram Measurements

Eye Diagram Measurements

使用Comm.Eyediagram System Object™在模拟信号上执行眼图测量。
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802.15.4（Zigbee®）系统的EVM测量

802.15.4（Zigbee®）系统的EVM测量

Use thecomm.EVMSystem object™ to measure the error vector magnitude (EVM) of a simulated IEEE® 802.15.4 [ 1 ] transmitter. IEEE 802.15.4 is the basis for the ZigBee specifications.
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BLE Blocking, Intermodulation and Carrier to Interference Performance Tests

BLE Blocking, Intermodulation and Carrier to Interference Performance Tests

Model Bluetooth® low energy (BLE) RF-PHY receiver tests specific to blocking, intermodulation and carrier to interference (C/I) performance as per the Bluetooth RF-PHY Test Specifications [ 1 ] using Communications Toolbox™ Library for the Bluetooth Protocol.
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Communications Toolbox Documentation
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