Create RF propagation model
Signal Strength of Receiver in Heavy Rain
Specify transmitter and receiver sites.
tx = txsite('Name','MathWorks Apple Hill',... 'Latitude',42.3001, ... 'Longitude',-71.3504, ... 'TransmitterFrequency', 2.5e9); rx = rxsite('Name','Fenway Park',... 'Latitude',42.3467, ... 'Longitude',-71.0972);
Create the propagation model for a heavy rainfall rate.
pm = propagationModel('rain','RainRate',50)
pm = Rain with properties: RainRate: 50 Tilt: 0
Calculate the signal strength at the receiver using the rain propagation model.
ss = sigstrength(rx,tx,pm)
ss = -87.1559
Longley-Rice Propagation Model
Create a default transmitter site.
tx = txsite;
Create a Longley-Rice propagation model by using the
pm = propagationModel("longley-rice","TimeVariabilityTolerance",0.7)
pm = LongleyRice with properties: AntennaPolarization: 'horizontal' GroundConductivity: 0.0050 GroundPermittivity: 15 AtmosphericRefractivity: 301 ClimateZone: 'continental-temperate' TimeVariabilityTolerance: 0.7000 SituationVariabilityTolerance: 0.5000
Find the coverage of the transmitter site by using the defined propagation model.
modelname — Name of propagation model
Name of propagation model, specified as one of these options. Each option creates a different type of object.
Free space propagation model.
Rain propagation model. For more information, see .
Gas propagation model. For more information, see .
Fog propagation model. For more information, see .
Close-in propagation model typically used in urban macro-cell scenarios. For more information, see .
The close-in model implements a statistical path loss model and can be configured for different scenarios. The default values correspond to an urban macro-cell scenario in a non-line-of-sight (NLOS) environment.
Longley-Rice propagation model. This model is also known as Irregular Terrain Model (ITM). You can use this model to calculate point-to-point path loss between sites over an irregular terrain, including buildings. Path loss is calculated from free-space loss, terrain diffraction, ground reflection, refraction through atmosphere, tropospheric scatter, and atmospheric absorption. For more information and list of limitations, see .
The Longley-Rice model implements the point-to-point mode of the model, which uses terrain data to predict the loss between two points.
Terrain Integrated Rough Earth Model™ (TIREM™). You can use this model to calculate point-to-point path loss between sites over an irregular terrain, including buildings.
Path loss is calculated from free-space loss, terrain diffraction, ground reflection, refraction through atmosphere, tropospheric scatter, and atmospheric absorption.
This model needs access to an external TIREM library. The actual model is valid from 1 MHZ to 1000 GHz, but with Antenna Toolbox™ elements and arrays, the frequency range is limited to 200 GHz.
A multipath propagation model that uses ray tracing analysis to compute propagation paths and corresponding path losses. Path loss is calculated from free-space loss, reflection and diffraction loss due to interactions with materials, and antenna polarization loss.
You can perform ray
tracing analysis using the shooting and bouncing
rays (SBR) method or the image method. Specify a
method using the
Both ray tracing methods are reasonable for a frequency range of 100 MHz to 100 GHz. For information about differences between the image and SBR methods, see Choose a Propagation Model.
"tirem" requires Antenna Toolbox.
Specify optional pairs of arguments as
the argument name and
Value is the corresponding value.
Name-value arguments must appear after other arguments, but the order of the
pairs does not matter.
Before R2021a, use commas to separate each name and value, and enclose
Name in quotes.
propagationModel("rain","RainRate",50) sets the rate of
rainfall in the rain propagation model to 50 millimeters per hour.
Each type of propagation model object supports a different set of properties. For a full list of the properties and their descriptions for a propagation model type, see the associated object page.
|Type of Propagation Model||Object Page|
 Sun, Shu, Theodore S. Rappaport, Timothy A. Thomas, Amitava Ghosh, Huan C. Nguyen, Istvan Z. Kovacs, Ignacio Rodriguez, Ozge Koymen, and Andrzej Partyka. “Investigation of Prediction Accuracy, Sensitivity, and Parameter Stability of Large-Scale Propagation Path Loss Models for 5G Wireless Communications.” IEEE Transactions on Vehicular Technology 65, no. 5 (May 2016): 2843–60. https://doi.org/10.1109/TVT.2016.2543139.
 International Telecommunications Union Radiocommunication Sector. Attenuation due to clouds and fog. Recommendation P.840-6. ITU-R, approved September 30, 2013. https://www.itu.int/rec/R-REC-P.840/en.
 International Telecommunications Union Radiocommunication Sector. Specific attenuation model for rain for use in prediction methods. Recommendation P.838-3. ITU-R, approved March 8, 2005. https://www.itu.int/rec/R-REC-P.838/en.
 Hufford, George A., Anita G. Longley, and William A.Kissick. A Guide to the Use of the ITS Irregular Terrain Model in the Area Prediction Mode. NTIA Report 82-100. National Telecommunications and Information Administration, April 1, 1982.
 Seybold, John S. Introduction to RF Propagation. Hoboken, N.J: Wiley, 2005.
 International Telecommunications Union Radiocommunication Sector. Attenuation by atmospheric gases. Recommendation P.676-11. ITU-R, approved September 30, 2016. https://www.itu.int/rec/R-REC-P.676/en.
 International Telecommunications Union Radiocommunication Sector. Effects of building materials and structures on radiowave propagation above about 100MHz. Recommendation P.2040-1. ITU-R, approved July 29, 2015. https://www.itu.int/rec/R-REC-P.2040/en.
 International Telecommunications Union Radiocommunication Sector. Electrical characteristics of the surface of the Earth. Recommendation P.527-5. ITU-R, approved August 14, 2019. https://www.itu.int/rec/R-REC-P.527/en.
 Yun, Zhengqing, and Magdy F. Iskander. “Ray Tracing for Radio Propagation Modeling: Principles and Applications.” IEEE Access 3 (2015): 1089–1100. https://doi.org/10.1109/ACCESS.2015.2453991.
 Schaubach, K.R., N.J. Davis, and T.S. Rappaport. “A Ray Tracing Method for Predicting Path Loss and Delay Spread in Microcellular Environments.” In [1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology, 932–35. Denver, CO, USA: IEEE, 1992. https://doi.org/10.1109/VETEC.1992.245274.
Version HistoryIntroduced in R2019b
propagationModel("raytracing-image-method") syntax has been removed
propagationModel("raytracing-image-method") syntax has been
propagationModel("raytracing") syntax instead, which
uses the shooting and bouncing rays (SBR) method by default. To use the image
method, specify the
Method name-value argument as
"image", for example
propagationModel("raytracing-image-method") syntax will be removed in a future release
propagationModel("raytracing-image-method") syntax issues a
warning that it will be removed in a future release.
R2021b: Default modeling method is shooting and bouncing rays method
Starting in R2021b, when you create a propagation model using the syntax
propagationModel("raytracing"), MATLAB® returns a
RayTracing model with the
Method value set to
"sbr" and two
reflections (instead of
"image" and one reflection as in previous
To create ray tracing propagation models that use the image method, use the syntax