Signal strength due to transmitter
Create a transmitter site.
tx = txsite('Name','Fenway Park', ... 'Latitude', 42.3467, ... 'Longitude', -71.0972);
Create a receiver site with sensitivity defined (in dBm).
rx = rxsite('Name','Bunker Hill Monument', ... 'Latitude', 42.3763, ... 'Longitude', -71.0611, ... 'ReceiverSensitivity', -90);
Calculate the received power and link margin. Link margin is the difference between the receiver's sensitivity and the received power.
ss = sigstrength(rx,tx)
ss = -71.1414
margin = abs(rx.ReceiverSensitivity - ss)
margin = 18.8586
Launch Site Viewer with buildings in Chicago. For more information about the osm file, see .
viewer = siteviewer("Buildings","chicago.osm");
Create a transmitter site on a building.
tx = txsite('Latitude',41.8800, ... 'Longitude',-87.6295, ... 'TransmitterFrequency',2.5e9);
Create a receiver site near another building.
rx = rxsite('Latitude',41.881352, ... 'Longitude',-87.629771, ... 'AntennaHeight',30);
Compute the signal strength by using a ray tracing propagation model. By default, the ray tracing model uses the image method and performs line-of-sight and single-reflection analysis.
pm = propagationModel("raytracing"); ssOneReflection = sigstrength(rx,tx,pm)
ssOneReflection = -54.0915
Compute signal strength with analysis up to two reflections, where total received power is the cumulative power of all propagation paths
pm.MaxNumReflections = 2; ssTwoReflections = sigstrength(rx,tx,pm)
ssTwoReflections = -52.3890
Observe the effect of material by replacing default concrete material with perfect reflector.
pm.BuildingsMaterial = 'perfect-reflector'; ssPerfect = sigstrength(rx,tx,pm)
ssPerfect = -41.9927
Plot the propagation paths.
raytrace(tx, rx, pm)
rx— Receiver site
rxsiteobject | array of
Receiver site, specified as a
rxsite object. You can use array inputs to
specify multiple sites.
tx— Transmitter site
txsiteobject | array of
Transmitter site, specified as a
txsite object. You can use array inputs to
specify multiple sites.
propmodel— Propagation model
Propagation model, specified as a character vector, a string, or a
propagation model created with the
propagationModel function. The default value depends on the
coordinate system used by the input sites:
|Coordinate System||Default propagation model value|
You can also specify the propagation model by using the
'PropagationModel' name-value pair argument.
comma-separated pairs of
the argument name and
Value is the corresponding value.
Name must appear inside quotes. You can specify several name and value
pair arguments in any order as
'Type'— Type of signal strength to compute
Type of signal strength to compute, specified as the comma-separated
pair consisting of
When type is
'power', signal strength is expressed
in power units (dBm) of the signal at the mobile receiver input. When
'efield', signal strength is expressed in
electric field strength units (dBμV/m) of signal wave incident on the
'PropagationModel'— Propagation model to use for path loss calculations
'raytracing'| propagation model created with
Propagation model to use for the path loss calculations, specified as
the comma-separated pair consisting of
'PropagationModel' and one of the following:
'freespace' — Free space propagation
'rain' — Rain propagation model
'gas' — Gas propagation model
'fog' — Fog propagation model
'close-in' — Close-in propagation
'longley-rice' — Longley-Rice
'tirem' — Tirem propagation
'raytracing' — Ray tracing propagation
model that uses the image method
A propagation model created with the
The default propagation model is
'longley-rice' when terrain is enabled and
'freespace' when terrain is disabled.
Terrain propagation models including
'tirem' are only supported for sites with
CoordinateSystem property set to
'Map'— Map for visualization or surface data
siteviewerobject | terrain name
Map for visualization or surface data, specified as the comma-separated pair
'Map and one of the following depending on the
|Coordinate System||Valid map values||Default map value|
[a] Alignment of boundaries and region labels are a presentation of the feature provided by the data vendors and do not imply endorsement by MathWorks®.
ss— Signal strength
Signal strength, returned as M-by-N array in dBm. M is the number of TX sites and N is the number of RX sites.