sigstrength
Received signal strength
Description
returns the signal strength using additional options specified by name-value
arguments and either of the previous syntaxes.ss
= sigstrength(___,Name,Value
)
Examples
Received Power and Link Margin at Receiver
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
Signal Strength Using Ray Tracing Propagation Model
Launch Site Viewer with buildings in Chicago. For more information about the osm file, see [1].
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 SBR method, and performs line-of-sight and two-reflection analysis.
pm = propagationModel("raytracing");
ssTwoReflections = sigstrength(rx,tx,pm)
ssTwoReflections = -52.4056
Plot the propagation paths for SBR with up to two reflections.
raytrace(tx,rx,pm)
Compute signal strength with analysis up to two reflections, where total received power is the cumulative power of all propagation paths
pm.MaxNumReflections = 5; ssFiveReflections = sigstrength(rx,tx,pm)
ssFiveReflections = -51.8927
Observe the effect of material by replacing default concrete material with perfect reflector.
pm.BuildingsMaterial = 'perfect-reflector';
ssPerfect = sigstrength(rx,tx,pm)
ssPerfect = -38.8614
Plot the propagation paths for SBR with up to five reflections.
raytrace(tx,rx,pm)
Appendix
[1] The osm file is downloaded from https://www.openstreetmap.org, which provides access to crowd-sourced map data all over the world. The data is licensed under the Open Data Commons Open Database License (ODbL), https://opendatacommons.org/licenses/odbl/.
Input Arguments
rx
— Receiver site
rxsite
object | array of rxsite
objects
Receiver site, specified as a rxsite
object. You can use array inputs to
specify multiple sites.
tx
— Transmitter site
txsite
object | array of txsite
objects
Transmitter site, specified as a txsite
object. You can use array inputs to
specify multiple sites.
propmodel
— Propagation model
character vector | string | propagation model created with propagationModel
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 |
---|---|
'geographic' |
|
'cartesian' |
|
You can also specify the propagation model by using the 'PropagationModel'
name-value pair argument.
Name-Value Arguments
Specify optional pairs of arguments as
Name1=Value1,...,NameN=ValueN
, where Name
is
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.
Example: 'Type','power'
Type
— Type of signal strength to compute
'power'
(default) | 'efield'
Type of signal strength to compute, specified as the comma-separated
pair consisting of 'Type
and
'power'
or 'efield'
.
When type is 'power'
, signal strength is expressed
in power units (dBm) of the signal at the mobile receiver input. When
type is 'efield'
, signal strength is expressed in
electric field strength units (dBμV/m) of signal wave incident on the
antenna.
The sigstrength
function is not supported for ray
tracing models when 'Type'
is
'efield'
.
Data Types: char
| string
PropagationModel
— Propagation model to use for path loss calculations
'longley-rice'
(default) | 'freespace'
| 'close-in'
| 'rain'
| 'gas'
| 'fog'
| 'raytracing'
| propagation model created with propagationModel
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 model'rain'
— Rain propagation model'gas'
— Gas propagation model'fog'
— Fog propagation model'close-in'
— Close-in propagation model'longley-rice'
— Longley-Rice propagation model'tirem'
— Tirem propagation model'raytracing'
— Ray tracing propagation model that uses the shooting and bouncing rays (SBR) methodA propagation model created with the
propagationModel
function
The default propagation model is 'longley-rice'
when terrain is enabled and 'freespace'
when terrain is disabled.
Terrain propagation models, including 'longley-rice'
and
'tirem'
, are only supported for sites with a
CoordinateSystem
value of
'geographic'
.
Data Types: char
Map
— Map for visualization or surface data
siteviewer
object | triangulation
object | string scalar | character vector
Map for visualization or surface data, specified as a siteviewer
object, a triangulation
object, a string scalar, or a character vector.
Valid and default values depend on the coordinate system.
Coordinate System | Valid map values | Default map value |
---|---|---|
'geographic' |
|
|
'cartesian' |
|
|
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®. |
Data Types: char
| string
Output Arguments
ss
— Signal strength
M-by-N array
Signal strength, returned as M-by-N array in dBm. M is the number of transmitter sites and N is the number of receiver sites.
Version History
Introduced in R2019bR2021b: 'raytracing'
propagation models use SBR method
Behavior changed in R2021b
Starting in R2021b, when you use the sigstrength
function and
specify the propmodel
argument or
PropagationModel
name-value argument as
'raytracing'
, the function uses the shooting and bouncing
rays (SBR) method and calculates up to two reflections. In previous releases, the
sigstrength
function uses the image method and calculates
up to one reflection.
To calculate received signal strength using the image method instead, create a
propagation model by using the propagationModel
function. Then, use the
sigstrength
function with the propagation model as input.
This example shows how to update your
code.
pm = propagationModel('raytracing','Method','image'); ss = sigstrength(rx,tx,pm)
For information about the SBR and image methods, see Choose a Propagation Model.
Starting in R2021b, all RF Propagation functions use the SBR method by default and calculate up to two reflections. For more information, see Default modeling method is shooting and bouncing rays method.
See Also
link
| sinr
| propagationModel
MATLAB 명령
다음 MATLAB 명령에 해당하는 링크를 클릭했습니다.
명령을 실행하려면 MATLAB 명령 창에 입력하십시오. 웹 브라우저는 MATLAB 명령을 지원하지 않습니다.
Select a Web Site
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a web site from the following list:
How to Get Best Site Performance
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.
Americas
- América Latina (Español)
- Canada (English)
- United States (English)
Europe
- Belgium (English)
- Denmark (English)
- Deutschland (Deutsch)
- España (Español)
- Finland (English)
- France (Français)
- Ireland (English)
- Italia (Italiano)
- Luxembourg (English)
- Netherlands (English)
- Norway (English)
- Österreich (Deutsch)
- Portugal (English)
- Sweden (English)
- Switzerland
- United Kingdom (English)