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Propagation und Kanalmodelle

Standort- und Terrain-Visualisierung, Angabe des Propagationsmodells (einschließlich Longley-Rice), Signalstärke, Signalabdeckungskarten und statische und Fadingkanal-Modelle

Die HF-Pfad-Propagationsmodellierung beschreibt das Verhalten elektromagnetischer Strahlung ausgehend von einem Sendepunkt, wenn das Signal die Umgebung durchquert. Modellieren Sie HF-Propagationspfade und visualisieren Sie diese in 3D.

Die Kanalmodellierung beschreibt das Over-the-Air-Umfeld von Kommunikationssystem-Verbindungen. Eine Analyse der Propagations- und Kanalmodellierung ist erforderlich, um zu verstehen, wie bei elektromagnetischen Wellen in verschiedenen Szenarien Verluste zwischen Sender und Empfänger auftreten. Modellieren und visualisieren Sie rauschbehaftete SISO- und MIMO-Kanäle mit Rayleigh-, Rician- oder WINNER-II-Fadingprofilen. Ebenfalls sind atmosphärische Störungen und mehrere Dopplerspektrum-Formen verfügbar.

Funktionen

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HF-Propagation

Kartendaten

`addCustomBasemap`	Add custom basemap
`addCustomTerrain`	Add custom terrain data
`removeCustomBasemap`	Remove custom basemap
`removeCustomTerrain`	Remove custom terrain data

Standort

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

Propagation und Visualisierung

`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
`link`	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`	Create RF propagation model
`pathloss`	Path loss of radio wave propagation

Pfadverlust

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

Koordinatensystem-Transformationen

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

Kanalmodellierung

Kanalmodelle

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

Kanal-Hilfsprogramme

`channelDelay`	Channel timing delay (Seit R2020a)
`convertSNR`	Convert SNR values (Seit R2022a)
`ofdmChannelResponse`	Calculate OFDM channel response (Seit 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

Objekte

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HF-Propagation

Standorte

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

Propagationsmodelle

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

Propagationsdaten

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

Kanalmodellierung

Kanalmodelle

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

Kanal-Hilfsprogramme

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

Blöcke

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Pfadverlust

Free Space Path Loss

Apply free space path loss to complex signal

Kanalmodellierung

Kanalmodelle

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

Kanal-Hilfsprogramme

OFDM Channel Response

Calculate OFDM channel response (Seit R2023a)

Themen

HF-Propagation

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. (Seit R2023b)

Kanalmodellierung

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.

Enthaltene Beispiele

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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