Main Content

Propagation and Channel Models

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.

Channel modeling describes the over-the-air environment in communications system links. Analysis of propagation and channel modelling is essential in understanding how electromagnetic waves incur losses from a transmitter to a receiver in different scenarios. Model and visualize noisy SISO and MIMO channels that have Rayleigh, Rician, or WINNER II fading profiles. Atmospheric impairments and multiple Doppler spectrum shapes are also available.

Functions

expand all

Map Data

addCustomBasemapAdd custom basemap
addCustomTerrainAdd custom terrain data
removeCustomBasemapRemove custom basemap
removeCustomTerrainRemove custom terrain data

Site

showShow site in Site Viewer
hideHide site from Site Viewer
distanceDistance between sites
angleAngle between sites
elevationElevation of site
locationCoordinates at distance and angle from site

Propagation and Visualization

coverageDisplay or compute coverage map
patternDisplay antenna radiation pattern in Site Viewer
sinrDisplay or compute signal-to-interference-plus-noise (SINR) ratio
linkDisplay or compute communication link status
sigstrengthReceived signal strength
raytraceDisplay or compute RF propagation rays
losDisplay or compute line-of-sight (LOS) visibility status
propagationModelCreate RF propagation model
pathlossPath loss of radio wave propagation

Path Loss

cranerainplRF signal attenuation due to rainfall using Crane model
rainplRF signal attenuation due to rainfall
gasplRF signal attenuation due to atmospheric gases
fogplRF signal attenuation due to fog and clouds
fsplFree space path loss
rayplPath loss and phase change for RF propagation ray
buildingMaterialPermittivityPermittivity and conductivity of building materials
earthSurfacePermittivityPermittivity and conductivity of earth surface materials

Channel Modeling

awgnAdd white Gaussian noise to signal
bscBinary symmetric channel
stdchanConstruct channel System object from set of standardized channel models

WINNER II Channel

winner2.AntennaArrayCreate antenna array
winner2.dipoleCalculate field pattern of half-wavelength dipole
winner2.layoutparsetWINNER II layout parameter configuration
winner2.wimGenerate channel coefficients using WINNER II channel model
winner2.wimparsetWINNER II model parameter configuration

Doppler Characteristics

dopplerConstruct Doppler spectrum structure

Coordinate System Transformations

rangeangleRange and angle calculation
global2localcoordConvert global to local coordinates
local2globalcoordConvert local to global coordinates
cart2sphvecConvert vector from Cartesian components to spherical representation
sph2cartvecConvert vector from spherical basis components to Cartesian components

Objects

expand all

Sites

txsiteCreate RF transmitter site
rxsiteCreate RF receiver site
siteviewerCreate Site Viewer
arrayConfigCreate phased array configuration

Propagation Models

FreeSpaceFree space propagation model
RainRain propagation model
GasGas propagation model
FogFog propagation model
CloseInClose-in propagation model
LongleyRiceLongley-Rice propagation model
RayTracingRay tracing propagation model

Propagation Data

propagationDataCreate RF propagation data from measurements
comm.RayCreate RF propagation ray
comm.AWGNChannelAdd white Gaussian noise to input signal
comm.RayTracingChannelFilter 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.MIMOChannelFilter input signal through MIMO multipath fading channel
comm.WINNER2ChannelFilter input signal through WINNER II fading channel
comm.gpu.AWGNChannelAdd white Gaussian noise to input signal with GPU
comm.ChannelFilterFilter signal using multipath gains at specified path delays
comm.ThermalNoiseAdd thermal noise to signal

Blocks

expand all

Free Space Path LossApply free space path loss to complex signal
AWGN ChannelAdd white Gaussian noise to input signal
SISO Fading ChannelFilter input signal through SISO multipath fading channel
MIMO Fading ChannelFilter input signal through MIMO multipath fading channel
Binary Symmetric ChannelIntroduce binary errors

Topics

RF 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.

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.

Using AWGN Channel Block for Coded Signals

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

Model the WINNER II channel using the WINNER II Channel Model for Communications Toolbox™ add-on.

Featured Examples