sinr

Display or compute signal-to-interference-plus-noise (SINR) ratio

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Syntax

sinr(txs)

sinr(txs,propmodel)

sinr(___,Name,Value)

pd = sinr(txs,___)

r = sinr(rxs,txs,___)

Description

example

sinr(txs)displays the signal-to-interference-plus-noise ratio (SINR) for transmitter sitestxsin the current Site Viewer. The map contours are generated using SINR values computed for receiver site locations on the map. For each location, the signal source is the transmitter site in TXS with the greatest signal strength. The remaining transmitter sites intxswith the same transmitter frequency act as sources of interference. Iftxsis scalar or there are no sources of interference the resultant map displays signal-to-noise ratio (SNR).

This function only supports plotting for antenna sites with aCoordinateSystemproperty value of'geographic'.

sinr(txs,propmodel)displays the SINR map with the propagation model set to the value inpropmodel.

sinr(___,Name,Value)sets properties using one or more name-value pairs, in addition to the input arguments in previous syntaxes. For example,sinr(txs,'MaxRange',8000)sets the range from the site location at 8000 meters to include in the SINR map region.

pd= sinr(txs,___)returns computed SINR data in the propagation data object,pd. No plot is displayed and any graphical only name-value pairs are ignored.

r= sinr(rxs,txs,___)returns thesinrin dB computed at the receiver sites due to the transmitter sites.

例子

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SINR Map for Multiple Transmitters

Open Live Script

Define names and location of sites in Boston.

names = ["Fenway Park","Faneuil Hall","Bunker Hill Monument"]; lats = [42.3467,42.3598,42.3763]; lons = [-71.0972,-71.0545,-71.0611];

Create a transmitter site array.

txs = txsite(“名称”, names,..."Latitude",lats,..."Longitude",lons,..."TransmitterFrequency",2.5e9);

Display the SINR map, where signal source for each location is selected as the transmitter site with the strongest signal.

sinr(txs)

Input Arguments

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`txs`—Transmitter sites
`txsite`object|array of`txsite`objects

Transmitter site, specified as atxsiteobject. Use array inputs to specify multiple sites.

This function only supports plotting antenna sites whenCoordinateSystemproperty is set to'geographic'.

`rxs`—Receiver sites
`rxsite`object|array of`rxsite`objects

Receiver site, specified as arxsiteobject. Use array inputs to specify multiple sites.

This function only supports plotting antenna sites whenCoordinateSystemproperty is set to'geographic'.

`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 thepropagationModelfunction. The default value depends on the coordinate system used by the input sites.

坐标系统	Default propagation model value
`'geographic'`	`'longley-rice'`when you use a terrain. `'freespace'`when you do not use a terrain.
`'cartesian'`	`'freespace'`when`Map`is set to none. `'raytracing'`when`Map`is set to the name of an STL file or a triangulation object. The default ray tracing model uses the shooting and bouncing rays (SBR) method.

You can also specify the propagation model by using the'PropagationModel'name-value pair argument.

Name-Value Arguments

Specify optional pairs of arguments asName1=Value1,...,NameN=ValueN, whereNameis the argument name andValueis 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 encloseNamein quotes.

Example:'MaxRange',8000

General

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`SignalSource`—Signal source of interest
`'strongest'`(default) |transmitter site object

Signal source of interest, specified as the comma-separated pair consisting ofSignalSourceand'strongest'or as a transmitter site object. When the signal source of interest is'strongest', the transmitter with the greatest signal strength is chosen as the signal source of interest for that location. When computingsinr,SignalSourcecan be atxsitearray with equal number of elementsrxswhere each transmitter site element defines the signal source for the corresponding receiver site.

`PropagationModel`—Propagation model to use for path loss calculations
`'longley-rice'`(default) |`'freespace'`|`'close-in'`|`'rain'`|`'gas'`|`“雾”`|`'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
“雾”— 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) method
A propagation model created with thepropagationModelfunction

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 aCoordinateSystemvalue of'geographic'.

Data Types:char

`ReceiverNoisePower`—Total noise power at receiver
`-107`(default) |scalar

Total noise power at receiver, specified as the comma-separated pair consisting of'ReceiverNoisePower'and a scalar in dBm. The default value assumes that the receiver bandwidth is 1 MHz and receiver noise figure is 7 dB.

$N = - 174 + 10 * \log (B) + F$

where,

N= Receiver noise in dBm
B在赫兹=接收机带宽
F= Noise figure in dB

`ReceiverGain`—Receiver gain
`2.1`(default) |scalar

Mobile receiver gain, specified as the comma-separated pair consisting of'ReceiverGain'and a scalar in dB. The receiver gain values include the antenna gain and the system loss. If you call the function using an output argument, the default value is computed usingrxs.

`ReceiverAntennaHeight`—Receiver antenna height
`1`(default) |scalar

Receiver antenna height above the ground, specified as the comma-separated pair consisting of'ReceiverAntennaHeight'and a scalar in meters. If you call the function using an output argument, the default value is computed usingrxs.

`Map`—Map for visualization or surface data
`siteviewer`object|`triangulation`object|string scalar|character vector

Map for visualization or surface data, specified as asiteviewerobject, atriangulationobject, a string scalar, or a character vector. Valid and default values depend on the coordinate system.

坐标系统	Valid map values	Default map value
`'geographic'`	A`siteviewer`object^a. A terrain name, if the function is called with an output argument. Valid terrain names are`'none'`,`'gmted2010'`, or the name of the custom terrain data added using`addCustomTerrain`.	The current`siteviewer`object or a new`siteviewer`object if none are open. `'gmted2010'`, if the function is called with an output.
`'cartesian'`	`'none'`. A`siteviewer`object. The name of an STL file. A`triangulation`object.	`'none'`.
^aAlignment 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

For Plotting SINR

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`Values`—Values of SINR for display
`[-5:20]`(default) |numeric vector

Values of SINR for display, specified as the comma-separated pair consisting of'Values'and a numeric vector. Each value is displayed as a different colored, filled on the contour map. The contour colors are derived usingColormapandColorLimits.

`MaxRange`—Maximum range of coverage map from each transmitter site
numeric scalar

Maximum range of coverage map from each transmitter site, specified as a positive numeric scalar in meters representing great circle distance.MaxRangedefines the region of interest on the map to plot. The default value is automatically computed based on the type of propagation model.

Type of Propagation Model	MaxRange
Atmospheric or empirical	`30`km
Terrain	`30`km or distance to the furthest building.
Ray tracing	`500`m

For more information about the types of propagation models, seeChoose a Propagation Model.

Data Types:double

`Resolution`—Resolution of receiver site locations used to compute SINR values
`'auto'`(default) |numeric scalar

Resolution of receiver site locations used to compute SINR values, specified as the comma-separated pair consisting of'Resolution'and'auto'or a numeric scalar in meters. The resolution defines the maximum distance between the locations. If the resolution is'auto',sinrcomputes a value scaled toMaxRange. Decreasing the resolution increases the quality of the SINR map and the time required to create it.

`Colormap`—Colormap for coloring filled contours
`'jet'`(default) |M-by-`3`array of RGB triplets

Colormap for coloring filled contours, specified as the comma-separated pair consisting of'ColorMap'and anM-by-3array of RGB triplets, whereMis the number of individual colors.

`ColorLimits`—Color limits for color maps
`[-5 20]`(default) |two-element vector

Color limits for color maps, specified as the comma-separated pair consisting of'ColorLimits'and a two-element vector of the form [min max]. The color limits indicate the SINR values that map to the first and last colors in the colormap.

`ShowLegend`—Show signal strength color legend on map
`'true'`(default) |`'false'`

Show signal strength color legend on map, specified as the comma-separated pair consisting of'ShowLegend'and'true'or'false'.

`Transparency`—Transparency of SINR map
`0.4`(default) |numeric scalar

Transparency of SINR map, specified as the comma-separated pair consisting of'Transparency'and a numeric scalar in the range 0–1. If the value is zero, the map is completely transparent. If the value is one, the map is completely opaque.

Output Arguments

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`r`— Signal to interference plus noise ratio at the receiver
numeric vector (default)

Signal to interference plus noise ratio at the receiver due to the transmitter sites, returned as a numeric vector. The vector length is equal to the number of receiver sites.

Data Types:double

`pd`— SINR data
`propagationData`object

SINR data, returned as apropagationDataobject consisting ofLatitudeandLongitude, and a signal strength variable corresponding to the plot type. Name of thepropagationDatais"SINR Data".

Version History

Introduced in R2018a

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R2021b:`'raytracing'`propagation models use SBR method

Behavior changed in R2021b

Starting in R2021b, when you use thesinrfunction and specify thepropmodelargument orPropagationModelname-value argument as'raytracing', the function uses the shooting and bouncing rays (SBR) method and calculates up to two reflections. In previous releases, thesinrfunction uses the image method and calculates up to one reflection.

To display or compute the SINR using the image method instead, create a propagation model by using thepropagationModelfunction. Then, use thesinrfunction with the propagation model as input. This example shows how to update your code.

pm = propagationModel('raytracing','Method','image'); sinr(txs,pm)

For information about the SBR and image methods, seeChoose 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, seeDefault modeling method is shooting and bouncing rays method.

sinr

Syntax

Description

例子

SINR Map for Multiple Transmitters

Input Arguments

txs—Transmitter sitestxsiteobject|array oftxsiteobjects

rxs—Receiver sitesrxsiteobject|array ofrxsiteobjects

propmodel—Propagation modelcharacter vector|string|propagation model created withpropagationModel

Name-Value Arguments

SignalSource—Signal source of interest'strongest'(default) |transmitter site object

PropagationModel—Propagation model to use for path loss calculations'longley-rice'(default) |'freespace'|'close-in'|'rain'|'gas'|“雾”|'raytracing'|propagation model created withpropagationModel

ReceiverNoisePower—Total noise power at receiver-107(default) |scalar

ReceiverGain—Receiver gain2.1(default) |scalar

ReceiverAntennaHeight—Receiver antenna height1(default) |scalar

Map—Map for visualization or surface datasiteviewerobject|triangulationobject|string scalar|character vector

Values—Values of SINR for display[-5:20](default) |numeric vector

MaxRange—Maximum range of coverage map from each transmitter sitenumeric scalar

Resolution—Resolution of receiver site locations used to compute SINR values'auto'(default) |numeric scalar

Colormap—Colormap for coloring filled contours'jet'(default) |M-by-3array of RGB triplets

ColorLimits—Color limits for color maps[-5 20](default) |two-element vector

ShowLegend—Show signal strength color legend on map'true'(default) |'false'

Transparency—Transparency of SINR map0.4(default) |numeric scalar

Output Arguments

r— Signal to interference plus noise ratio at the receivernumeric vector (default)

pd— SINR datapropagationDataobject

Version History

R2021b:'raytracing'propagation models use SBR method

See Also

`txs`—Transmitter sites
`txsite`object|array of`txsite`objects

`rxs`—Receiver sites
`rxsite`object|array of`rxsite`objects

`propmodel`—Propagation model
character vector|string|propagation model created with`propagationModel`

`SignalSource`—Signal source of interest
`'strongest'`(default) |transmitter site object

`PropagationModel`—Propagation model to use for path loss calculations
`'longley-rice'`(default) |`'freespace'`|`'close-in'`|`'rain'`|`'gas'`|`“雾”`|`'raytracing'`|propagation model created with`propagationModel`

`ReceiverNoisePower`—Total noise power at receiver
`-107`(default) |scalar

`ReceiverGain`—Receiver gain
`2.1`(default) |scalar

`ReceiverAntennaHeight`—Receiver antenna height
`1`(default) |scalar

`Map`—Map for visualization or surface data
`siteviewer`object|`triangulation`object|string scalar|character vector

`Values`—Values of SINR for display
`[-5:20]`(default) |numeric vector

`MaxRange`—Maximum range of coverage map from each transmitter site
numeric scalar

`Resolution`—Resolution of receiver site locations used to compute SINR values
`'auto'`(default) |numeric scalar

`Colormap`—Colormap for coloring filled contours
`'jet'`(default) |M-by-`3`array of RGB triplets

`ColorLimits`—Color limits for color maps
`[-5 20]`(default) |two-element vector

`ShowLegend`—Show signal strength color legend on map
`'true'`(default) |`'false'`

`Transparency`—Transparency of SINR map
`0.4`(default) |numeric scalar

`r`— Signal to interference plus noise ratio at the receiver
numeric vector (default)

`pd`— SINR data
`propagationData`object

R2021b:`'raytracing'`propagation models use SBR method