传播和渠道模型

Site and terrain visualization, propagation model specification (including Longley-Rice), signal strength, signal coverage maps, and static and fading channel models

RF path propagation modeling describes the behavior of electromagnetic radiation from a point of transmission as the signal travels through the surrounding environment. Model RF propagation paths and visualize them in 3-D.

渠道建模描述了通信系统链接中的无线环境。在不同情况下，电磁波如何从发射器到接收器产生电磁波损失，对传播和通道建模的分析至关重要。模型并可视化具有Rayleigh，Rician或Winner II褪色曲线的嘈杂的Siso和Mimo通道。还提供大气障碍和多个多普勒光谱形状。

Functions

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RF Propagation

Map Data

`addCustomBasemap`	Add custom basemap
`addCustomTerrain`	Add custom terrain data
`删除CustomBasemap`	Remove custom basemap
`删除CustomTerrain`	删除自定义地形数据

Site

`show`	Show site in Site Viewer
`hide`	Hide site from Site Viewer
`distance`	Distance between sites
`angle`	Angle between sites
`海拔`	Elevation of site
`location`	从站点坐标的距离和角度

传播和可视化

`coverage`	Display or compute coverage map
`pattern`	Display antenna radiation pattern in Site Viewer
`sinr`	Display or compute signal-to-interference-plus-noise (SINR) ratio
`关联`	Display or compute communication link status
`sigstrength`	Received signal strength
`Raytrace`	Display or compute RF propagation rays
`los`	Display or compute line-of-sight (LOS) visibility status
`propagationModel`	创建RF传播模型
`pathloss`	Path loss of radio wave propagation

Path Loss

`cranerainpl`	RF信号衰减是由于降雨using Crane model
`rainpl`	RF信号衰减是由于降雨
`gaspl`	RF signal attenuation due to atmospheric gases
`fogpl`	RF信号衰减是由于雾和云而引起的
`FSPL`	Free space path loss
`Raypl`	Path loss and phase change for RF propagation ray
`建筑物质量`	Permittivity and conductivity of building materials
`earthSurfacePermittivity`	地面材料的介电和电导率

Channel Models

Channel Modeling

`AWGN`	Add white Gaussian noise to signal
`bsc`	Binary symmetric channel
`convertSNR`	Convert SNR values
`stdchan`	构造渠道System objectfrom set of standardized channel models

WINNER II Channel

`winner2.AntennaArray`	Create antenna array
`winner2.dipole`	计算半波长偶极子的场图
`winner2.layoutparset`	WINNER II layout parameter configuration
`winner2.wim`	Generate channel coefficients using WINNER II channel model
`winner2.wimparset`	获胜者II模型参数配置

多普勒特征

多普勒 Construct Doppler spectrum structure

坐标系统转换

`rangeangle`	Range and angle calculation
`global2localcoord`	Convert global to local coordinates
`local2globalcoord`	Convert local to global coordinates
`CART2SPHVEC`	Convert vector from Cartesian components to spherical representation
`sph2cartvec`	Convert vector from spherical basis components to Cartesian components

Objects

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RF Propagation

Sites

`txsite`	Create RF transmitter site
`rxsite`	创建RF接收器网站
`siteviewer`	创建站点查看器
`arrayConfig`	创建分阶段阵列配置

Propagation Models

`FreeSpace`	Free space propagation model
`雨`	雨propagation model
`Gas`	Gas propagation model
`Fog`	Fog propagation model
`逼近`	Close-in propagation model
`Longleyrice`	Longley-Rice propagation model
`RayTracing`	Ray tracing propagation model

Propagation Data

`propagationData`	从测量中创建RF传播数据
`comm.ray`	Create RF propagation ray

Channel Models

`comm.AWGNChannel`	将白色高斯噪声添加到输入信号
`comm.rayTracingChannel`	Filter signal through multipath fading channel defined by propagation rays
`comm.rayleighChannel`	Filter input signal through multipath Rayleigh fading channel
`COMM.RICIANCHANNEL`	Filter input signal through multipath Rician fading channel
`Comm.Mimochannel`	Filter input signal through MIMO multipath fading channel
`comm.WINNER2Channel`	Filter input signal through WINNER II fading channel
`comm.gpu.AWGNChannel`	使用GPU添加白色高斯噪声到输入信号
`comm.ChannelFilter`	Filter signal using multipath gains at specified path delays
`comm.ThermalNoise`	Add thermal noise to signal

Blocks

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Path Loss

自由空间路径损失

Apply free space path loss to complex signal

Channel Models

AWGN Channel	将白色高斯噪声添加到输入信号
SISO Fading Channel	Filter input signal through SISO multipath fading channel
MIMO Fading Channel	Filter input signal through MIMO multipath fading channel
Binary Symmetric Channel	引入二进制错误

Topics

RF Propagation

Choose a Propagation Model
When to use the different propagation models based on frequency, type, and limitations.
RF传播和可视化
可视化室外和室内环境中的覆盖范围图，SINR图和传播路径。
Ray Tracing for Wireless Communications
Ray tracing models predict propagation paths and corresponding losses using 3-D environment geometry and electromagnetic analysis.

Channel Modeling

AWGN Channel
Model channel and RF impairment characteristics.
Configure Eb/No for AWGN Channels with Coding
This example shows how to set the bit energy to noise density ratio (Eb/No) for communication links employing channel coding.
使用AWGN通道块进行编码信号
Two links perform error control coding on a signal that has passed through an impairment channel.
Fading Channels
Defining a fading channel object and applying it to a signal.
Visualize Effects of Frequency-Selective Fading
Pass FSK and QPSK signals through a Rayleigh multipath fading channel. Change the signal bandwidths to observe the impact of the fading channel on the FSK spectrum and the QPSK constellation.
WINNER II Channel
使用The Winner II频道建模通信工具箱的获胜者II频道模型™add-on.

特色的例子

Indoor MIMO-OFDM Communication Link using Ray Tracing

在室内环境中执行射线跟踪，并使用结果使用MIMO-OFDM技术构建链接级别模拟的通道模型。

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Visualize Antenna Coverage Map and Communication Links

Calculate and visualize signal strength between a transmitter and multiple receivers. The visualizations include an area coverage map and colored communication links. The example also shows selection of a directional antenna in order to achieve a communication link to a specific location.

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Urban Link and Coverage Analysis Using Ray Tracing

Use ray tracing to analyze communication links and coverage areas in an urban environment. Within the example:

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GSM, CDMA and WiMAX Channel Models

Simulate multipath fading channels defined for GSM/EDGE [ 1 2 ], CDMA [ 3 ], and WiMAX [ 4 ] wireless standards. The example uses the Rayleigh and MIMO fading channel System objects™ from Communications Toolbox™ to simulate and visualize the channels.

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Multipath Fading Channel

Use Rayleigh and Rician multipath fading channel System objects and their built-in visualization to model a fading channel. Rayleigh and Rician fading channels are useful models of real-world phenomena in wireless communication. These phenomena include multipath scattering effects, time dispersion, and Doppler shifts that arise from relative motion between the transmitter and receiver.

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Multipath Fading Channel in Simulink

How to use the SISO Fading Channel block from the Communications Toolbox™ to simulate multipath Rayleigh and Rician fading channels, which are useful models of real-world phenomena in wireless communications. These phenomena include multipath scattering effects, time dispersion, and Doppler shifts that arise from relative motion between the transmitter and receiver. The model also shows how to visualize channel characteristics such as the impulse and frequency responses, Doppler spectrum and component gains.

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HF Ionospheric Channel Models

Simulate High-Frequency (HF) ionospheric channels, based on the models described in Recommendation ITU-R F.1487. In particular, it shows how to simulate the general Watterson channel model, and other simplified channel models used in the quantitative testing of HF modems. It makes use of the comm.RayleighChannel System object™ and stdchan function along with the Gaussian and bi-Gaussian Doppler structures from Communications Toolbox™.

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Simultaneous Simulation of Multiple Fading Channels with WINNER II Channel Model

Set up a system with multiple base stations (BS), multiple mobile stations (MS) and multiple MIMO downlinks from one BS sector to one MS. You must download and install the WINNER II Channel Model for Communications Toolbox™ Add-On to run this example. Each link is assigned with a propagation scenario and condition. Fading channel coefficients for all links are generated simultaneously. An impulse signal is passed through the fading channel for each link. The received impulse and frequency responses are plotted for selected links.

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802.11ac Multiuser MIMO Precoding with WINNER II Channel Model

The transmit and receive processing for a 802.11ac™ multiuser downlink transmission over a WINNER II fading channel. You must download and install the WINNER II Channel Model for Communications Toolbox™ Add-On to run this example. Only one WINNER II channel System object™ is needed to set up the channels from one access point to all users.

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邻近和共通道干扰

This model uses PSK-modulated signals to show the effects of adjacent and co-channel interference on a transmitted signal. You can view the effect of adjacent channel interferer and co-channel interferer together or individually.

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