Propagation et modèles de canaux

Visualisation de données terrain et de site, spécification de modèles de propagation (y compris Longley-Rice), force du signal, cartes de couverture du signal et modèles de canaux statiques et d’affaiblissement

La modélisation de la propagation des chemins RF décrit le comportement du rayonnement électromagnétique à partir d’un point d’émission pendant que le signal traverse l’environnement. Vous pouvez modéliser les chemins de propagation RF et les visualiser en 3D.

La modélisation de canal décrit l’environnement radio des liaisons des systèmes de communications. L’analyse de modèles de propagation et de canaux est essentielle pour comprendre les pertes subies par les ondes électromagnétiques entre un émetteur et un récepteur dans différents scénarios. Il est possible de modéliser et de visualiser des canaux SISO et MIMO bruités avec des profils d’affaiblissement Rayleigh, Rician ou WINNER II. Des imperfections atmosphériques sont également disponibles ainsi que diverses formes de spectre Doppler.

Fonctions

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Propagation RF

Cartographier les données

`addCustomBasemap`	Add custom basemap
`addCustomTerrain`	Add custom terrain data (depuis R2019b)
`removeCustomBasemap`	Remove custom basemap
`removeCustomTerrain`	Remove custom terrain data (depuis R2019b)

Site

`show`	Show site in Site Viewer (depuis R2019b)
`hide`	Hide site from Site Viewer (depuis R2019b)
`distance`	Distance between sites (depuis R2019b)
`angle`	Angle between sites (depuis R2019b)
`elevation`	Elevation of site (depuis R2019b)
`location`	Coordinates at distance and angle from site (depuis R2019b)

Propagation et visualisation

`coverage`	Display or compute coverage map (depuis R2019b)
`pattern`	Display antenna radiation pattern in Site Viewer (depuis R2019b)
`sinr`	Display or compute signal-to-interference-plus-noise (SINR) ratio (depuis R2019b)
`link`	Display or compute communication link status (depuis R2019b)
`sigstrength`	Received signal strength (depuis R2019b)
`raytrace`	Display or compute RF propagation rays (depuis R2019b)
`los`	Display or compute line-of-sight (LOS) visibility status (depuis R2019b)
`propagationModel`	Create RF propagation model (depuis R2019b)
`pathloss`	Path loss of radio wave propagation (depuis R2019b)

Atténuation

`cranerainpl`	RF signal attenuation due to rainfall using Crane model (depuis R2020a)
`rainpl`	RF signal attenuation due to rainfall
`gaspl`	RF signal attenuation due to atmospheric gases
`fogpl`	RF signal attenuation due to fog and clouds
`fspl`	Free space path loss
`raypl`	Path loss and phase change for RF propagation ray (depuis R2020a)
`buildingMaterialPermittivity`	Permittivity and conductivity of building materials (depuis R2020a)
`earthSurfacePermittivity`	Permittivity and conductivity of earth surface materials (depuis R2020a)

Transformations du système de coordonnées

`rangeangle`	Range and angle calculation (depuis R2019b)
`global2localcoord`	Convert global to local coordinates (depuis R2020a)
`local2globalcoord`	Convert local to global coordinates (depuis R2020a)
`cart2sphvec`	Convert vector from Cartesian components to spherical representation (depuis R2020a)
`sph2cartvec`	Convert vector from spherical basis components to Cartesian components (depuis R2020a)

Modélisation de canal

Modèles de canaux

`awgn`	Add white Gaussian noise to signal
`bsc`	Binary symmetric channel
`stdchan`	Construct channel System object from set of standardized channel models

Utilitaires pour les canaux

`channelDelay`	Channel timing delay (depuis R2020a)
`convertSNR`	Convert SNR values (depuis R2022a)
`ofdmChannelResponse`	Calculate OFDM channel response (depuis R2023a)
`doppler`	Construct Doppler spectrum structure
`winner2.AntennaArray`	Create antenna array for WINNER II channel model
`winner2.dipole`	Calculate half-wavelength dipole field pattern for WINNER II channel model
`winner2.layoutparset`	WINNER II layout parameter configuration
`winner2.wim`	Generate channel coefficients using WINNER II channel model
`winner2.wimparset`	WINNER II model parameter configuration

Objets

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Propagation RF

Sites

`txsite`	Create RF transmitter site (depuis R2019b)
`rxsite`	Create RF receiver site (depuis R2019b)
`siteviewer`	Create Site Viewer (depuis R2019b)
`arrayConfig`	Create phased array configuration (depuis R2020b)

Modèles de propagation

`FreeSpace`	Free space propagation model (depuis R2019b)
`Rain`	Rain propagation model (depuis R2019b)
`Gas`	Gas propagation model (depuis R2019b)
`Fog`	Fog propagation model (depuis R2019b)
`CloseIn`	Close-in propagation model (depuis R2019b)
`LongleyRice`	Longley-Rice propagation model (depuis R2019b)
`RayTracing`	Ray tracing propagation model (depuis R2019b)

Données de propagation

`propagationData`	Create RF propagation data from measurements (depuis R2020a)
`comm.Ray`	Create RF propagation ray (depuis R2020a)

Modélisation de canal

Modèles de canaux

`comm.AWGNChannel`	Add white Gaussian noise to input signal
`comm.RayTracingChannel`	Filter signal through multipath fading channel defined by propagation rays (depuis R2020b)
`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`	Add white Gaussian noise to input signal with GPU
`uwbChannel`	Filter input signal through UWB IEEE 802.15.4 a/z/ab channel (depuis R2024a)

Utilitaires pour les canaux

comm.ChannelFilter Filter signal using multipath gains at specified path delays (depuis R2020b)

Blocs

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Atténuation

Free Space Path Loss

Apply free space path loss to complex signal

Modélisation de canal

Modèles de canaux

AWGN Channel	Add white Gaussian noise to input signal
Binary Symmetric Channel	Introduce binary errors
MIMO Fading Channel	Filter input signal through MIMO multipath fading channel
SISO Fading Channel	Filter input signal through SISO multipath fading channel

Utilitaires pour les canaux

OFDM Channel Response

Calculate OFDM channel response (depuis R2023a)

Rubriques

Propagation RF

Choose a Propagation Model
When to use the different propagation models based on frequency, type, and limitations.
RF Propagation and Visualization
Visualize coverage maps, SINR maps, and propagation paths in outdoor and indoor environments.
Ray Tracing for Wireless Communications
Ray tracing models predict propagation paths and corresponding losses using 3-D environment geometry and electromagnetic analysis.
Customize Buildings for Ray Tracing Analysis
Customize the buildings stored in an OpenStreetMap^® file and then perform ray tracing analysis on a scene created from the buildings. (depuis R2023b)

Modélisation de canal

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.
Using AWGN Channel Block for Coded Signals
When your simulation uses coding, the Eb/N0 setting for the AWGN channel must be adjusted by the coding rate to apply the desired signal to noise (SNR) ratio.
Fading Channels
Defining a fading channel object and applying it to a signal.
Channel Visualization
These channel modeling System objects and blocks in Communications Toolbox™ include an option to visualize the characteristics of a fading channel.
WINNER II Channel
Model the WINNER II channel using the WINNER II Channel Model for Communications Toolbox add-on.

Exemples présentés

Indoor MIMO-OFDM Communication Link Using Ray Tracing

Perform ray tracing in an indoor environment and use the results to build a channel model for a link level simulation with the MIMO-OFDM technique.

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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.

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Analyze Communication Link for Aircraft over Seawater Using Ray Tracing

Use ray tracing to predict the path gain and signal strength of a radio link for an aircraft flying over seawater.

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Visualize Coverage Maps over Lunar Terrain Using Ray Tracing

Create a coverage map for a base station on the surface of the Moon using terrain data and ray tracing analysis.

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GSM, CDMA and WiMAX Channel Models

Simulate multipath fading channels defined for GSM, EDGE, CDMA, and WiMAX wireless standards.

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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 and display the spectral characteristics of the channel.

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Multipath Fading Channel in Simulink

Simulate multipath Rayleigh and Rician fading channels by using the SISO Fading Channel block.

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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.

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Simultaneous Simulation of Multiple Fading Channels with WINNER II Channel Model

Set up a system with multiple base stations, multiple mobile stations, and multiple MIMO downlinks from one BS sector to one MS.

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802.11ac Multiuser MIMO Precoding with WINNER II Channel Model

Transmit and receive processing for a IEEE^® 802.11ac™ multiuser downlink transmission over a WINNER II fading channel.

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Adjacent and Co-Channel Interference

Use PSK-modulated signals to show the effects of adjacent and co-channel interference on a transmitted signal.

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