sinr

Display signal-to-interference-plus-noise ratio (SINR) map

Description

example

sinr(txs) displays the signal-to-interference-plus-noise ratio (SINR) for transmitter sites, txs. Each colored contour of the map defines the areas where the corresponding SINR is available to a mobile receiver. For each location, the signal source is the transmitter site in txs with the greatest signal strength. The remaining transmitter sites in txs act as interference. If txs is scalar, or there are no sources of interference, the resultant map displays signal-to-noise ratio (SNR).

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

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.

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

Examples

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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('Name', 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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Transmitter site, specified as a txsite object. Use array inputs to specify multiple sites.

Receiver site, specified as a rxsite object. Use array inputs to specify multiple sites.

Propagation model, specified as a character vector or string. You can use the propagationModel function to define this input.

You can also use the name-value pair 'PropagationModel' to specify this parameter.

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is 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 Name1,Value1,...,NameN,ValueN.

Example: 'MaxRange',8000

General

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Signal source of interest, specified as '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 computing sinr, SignalSource can be a txsite array with equal number of elements rxs where each transmitter site element defines the signal source for the corresponding receiver site.

Propagation model to use for path loss calculations, specified as 'freespace', 'close-in', 'rain', 'gas', 'fog', 'longley-rice', or as an object created using the propagationModel function.

Total noise power at receiver, specified as a scalar in dBm. The default value assumes that the receiver bandwidth is 1 MHz and receiver noise figure is 7 dB.

where,

  • N = Receiver noise in dBm

  • B = Receiver bandwidth in Hz

  • F = Noise figure in dB

Mobile receiver gain, specified as 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 using rxs.

Receiver antenna height above the ground, specified as a scalar in meters. If you call the function using an output argument, the default value is computed using rxs.

Map for surface data, specified as a siteviewer object or a terrain name. Valid terrain names are 'none', 'gmted2010', or the name of the custom terrain data added using addCustomTerrain. The default value is the current Site Viewer or 'gmted2010', if none is open.

Data Types: char | string

For Plotting SINR

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Values of SINR for display, specified as numeric vector. Each value is displayed as a different colored, filled on the contour map. The contour colors are derived using Colormap and ColorLimits.

Maximum range of the SINR map from each transmitter site, specified as a positive numeric scalar in meters representing a great circle distance. This property defines the region of interest on the map to plot. If the 'Map' is a siteviewer object with 'Buildings' specified, the default value is the distance to the farthest building. Otherwise, the default value is 30000 m or 30 km.

Note

When using terrain, the MaxRange limit is 300,000 m.

Data Types: double

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

Colormap for coloring filled contours, specified as an M-by-3 array of RGB triplets, where M is the number of individual colors.

Color limits for color maps, specified as 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.

Show signal strength color legend on map, specified as 'true' or 'false'.

Transparency of SINR map, specified as 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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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

Introduced in R2018a