Propagazione e modelli del canale

Visualizzazione del sito e del terreno, specifiche del modello di propagazione (compreso Longley-Rice), potenza del segnale, mappe di copertura del segnale e modelli di canale statici e in dissolvenza

La modellazione della propagazione del percorso RF descrive il comportamento della radiazione elettromagnetica da un punto di trasmissione mentre il segnale viaggia attraverso l'ambiente circostante. Modellare i percorsi di propagazione RF e visualizzarli in maniera tridimensionale.

La modellazione del canale descrive l'ambiente via etere nei collegamenti dei sistemi di comunicazione. L'analisi della propagazione e la modellazione del canale sono essenziali per comprendere come le onde elettromagnetiche subiscano perdite da un trasmettitore a un ricevitore in diversi scenari. Modellare e visualizzare canali SISO e MIMO rumorosi con profili di dissolvenza Rayleigh, Rician o WINNER II. Sono inoltre disponibili i disturbi atmosferici e le forme multiple dello spettro Doppler.

Funzioni

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Propagazione RF

Mappatura dei dati

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

Sito

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

Propagazione e visualizzazione

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

Perdita del percorso

`cranerainpl`	RF signal attenuation due to rainfall using Crane model (Da 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 (Da R2020a)
`buildingMaterialPermittivity`	Permittivity and conductivity of building materials (Da R2020a)
`earthSurfacePermittivity`	Permittivity and conductivity of earth surface materials (Da R2020a)

Trasformazioni del sistema di coordinate

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

Modellazione del canale

Modelli del canale

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

Utilità del canale

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

Oggetti

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Propagazione RF

Siti

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

Propagazione dei modelli

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

Propagazione dei dati

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

Modellazione del canale

Modelli del canale

`comm.AWGNChannel`	Add white Gaussian noise to input signal
`comm.RayTracingChannel`	Filter signal through multipath fading channel defined by propagation rays (Da 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 (Da R2024a)

Utilità del canale

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

Blocchi

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Perdita del percorso

Free Space Path Loss

Apply free space path loss to complex signal

Modellazione del canale

Modelli del canale

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

Utilità del canale

OFDM Channel Response

Calculate OFDM channel response (Da R2023a)

Argomenti

Propagazione 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. (Da R2023b)

Modellazione del canale

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.

Esempi in primo piano

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.

Apri live script

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.

Apri live script

Urban Link and Coverage Analysis Using Ray Tracing

Use ray tracing to analyze communication links and coverage areas in an urban environment.

Apri live script

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.

Apri live script

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.

Apri live script

GSM, CDMA and WiMAX Channel Models

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

Apri script

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.

Apri live script

Multipath Fading Channel in Simulink

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

Apri script

HF Ionospheric Channel Models

Simulate High-Frequency (HF) ionospheric channels, based on the models described in Recommendation ITU-R F.1487.

Apri live script

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.

Apri live script

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.

Apri script

Adjacent and Co-Channel Interference

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

Apri modello