wiki:Manual/Scenario/InterferingLink

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Interfering links tab

This tab is aimed to update the parameters of interfering link in a scenario, create new interfering links or delete existing ones.

A given simulation workspace must contain at least one interfering link. Each Interfering link will be defined by two elements: an Interfering link transmitter (ILT) and Interfering link receiver (ILR). A newly created interfering link is automatically initialised with the default parameters of first transmitter and receiver available in the SEAMCAT library.

In the upper part of the tab, you have three panels


List of interferers

You can create as many interfering links as you want. Scroll up and down to select the interfering link to modify or to compare them. See separate section on how to generate multiple interferers.

Identification

You can name and write some description of the victim system you want to simulate.

System selection

You can choose various systems. They can be either generic (scope of this page) or cellular like CDMA or OFDMA system.

General

You can set the frequency distribution (MHz) of the interfering transmitter, may be set constant or random

Select a link reference in the displayed list and change the parameters. You have access to 5 sub tabs to set the interfering link.

  • Receiver (ILR)
  • Transmitter (ILT)
  • Transmitter to Receiver Path (ILT -> ILR)
  • Transmitter to Victim Link Receiver Path (ILT -> VLR)
  • Transmitter to Victim Link Tansmitter Path (ILT -> VLT) (available only if cognitive radio is activated)

Interfering Link Transmitter (ILT)

4 panels form the necessary information to fill in for setting the interfering link tranmsitter.


Transmitter identification

  • Library: allows to import/export the receiver characteristics from/to the library to/from the workspace
  • freely chose a name and a description.

Antenna Pointing

It contains all information relative to the antenna other than the radiation pattern (Please read here more about antenna azimuth/elevation settings);

  • Antenna height distribution (m),
  • Azimuth ref.(°) when selected the antenna by default (i.e. for an antenna azimuth distribution of 0°) is pointing at the VLT. If not selected, it looks EAST.
  • Antenna azimuth distribution (°),
  • Elevation ref.(°) when selected the antenna by default (i.e. for an antenna elevation distribution of 0°) is tilted towards the VLT. If not selected, it is set horizontal.
  • Antenna elevation distribution (°).

Antenna Patterns identification

It contains all information relative to the antenna radiation pattern

  • Library: allows to import/export the antenna pattern from/to the library to/from the workspace
  • Antenna name and description: you may freely edit it
  • Antenna description: you may be freely edit it
  • Antenna peak gain (dBi) and pattern selectors. See separate guidance on the the radiation pattern.

Emission characteristics

Interfering Link Receiver (ILR)

5 panels form the necessary information to fill in for setting the interfering link tranmsitter.


  • Receiver identification:
    • Library: allows to import/export the receiver characteristics from/to the library to/from the workspace
    • freely chose a name and a description.
  • Antenna Pointing: it contains all information relative to the antenna other than the radiation pattern (Please read here more about antenna azimuth/elevation settings);
    • Antenna height distribution (m),
    • Azimuth ref.(°) when selected the antenna by default (i.e. for an antenna azimuth distribution of 0°) is pointing at the VLT. If not selected, it looks EAST.
    • Antenna azimuth distribution (°),
    • Elevation ref.(°) when selected the antenna by default (i.e. for an antenna elevation distribution of 0°) is tilted towards the VLT. If not selected, it is set horizontal.
    • Antenna elevation distribution (°).
  • Antenna Patterns identification: it contains all information relative to the antenna radiation pattern
    • Library: allows to import/export the antenna pattern from/to the library to/from the workspace
    • Antenna name and description: you may freely edit it
    • Antenna description: you may freely edit it
    • Antenna peak gain (dBi) and pattern selectors. See separate guidance on the the radiation pattern.
  • Reception characteristics:
    • Sensitivity (dBm)

Transmitter to Receiver Path (ILT -> ILR)

3 elements characterised the path between the ILT -> ILR.


Relative location

You have 2 primary options to define type of mutual placement of ILR with respect to ILT (see convention):

  • When the Correlated distance option is checked, it means that the positions of ILR and ILT are fixed with respect to each other, and you can enter dX/dY distances from VLT to VLR (ILT is considered a reference centre);
  • When the correlated distance is unchecked, it means that ILR is randomly moving around ILT and the two parameters define the range of this random movement:
    • Path azimuth (deg) - describes the azimuthal direction of possible ILR locations as seen from ILT.
    • Path distance factor (times) - describes the extent of possible ILR locations in terms of distance from ILT. Note: This field described only the random factor, whereas the actual distance will be obtained during calculations? by multiplying the trialled factor value with the coverage radius value, defined in the next field on this dialog window. Please read about the suitable choice of distribution function for azimuth/distance factor.
    • you can set the center of your distribution by setting dX/dY

Coverage radius

You have the possibility to define the maximum range of ILR-ILT placement when they are placed in non-correlated fashion:

  • User-defined radius option allows you to enter the maximum radius directly below;
  • Noise-limited network option will calculate the coverage radius based on the formula for noise-limited network. If this option is chosen, a set of input boxes will appear below allowing you to enter specific parameters required for this calculation;
  • Traffic-limited network option will calculate the coverage radius based on the formula for traffic-limited network. If this option is chosen, a set of input boxes will appear below allowing you to enter specific parameters required for this calculation.

Propagation Model

You can choose the suitable propagation model to be applied when calculating signal loss along the ILT-ILR path. Please see the separate information pages regarding the choice and settings of the propagation models.

Transmitter to Victim Link Receiver Path (ILT -> VLR)

4 elements characterised the path between the ILT -> ILR.


(Victim system: Generic, interfering system: Generic) (see convention):

  • None : You can directly define the radius of a circular area (called simulation radius) where a number of active transmitters are located. you can define the random placement of ILTs in this area with the azimuth and distance factor distributions.
    • Position relative to VLT or VLR
    • Delta X and Y
    • set the
    • distance factor distribution of the IT with regards to the VR,
    • azimuth distribution of the IT placement with regards to the VR position,
    • simulation radius,
    • number of active transmitters
  • Uniform density : each interfering signal calculation results from the contribution of nactive interering transmitters uniformly located in a circular area, the radius of which (called simulation radius) is automatically derived from the density and activity of transmitters (see the Interferers density panels). Note: For further information about the calculations based on the density parameters, refer to section on  relative location of IT and VR.
    • azimuth distribution of the IT placement with regards to the VR position,
    • nactive : number of active interferers in the simulation,
    • densit: density of interfering transmitters,
    • Pit : probability of transmission,
    • activityit(time) : a kind of look-up table, which describes a temporal activity variation as a function of the time of the day (e.g. for various hours of the day). The time value used for looking up a particular activity value for a given simulation is fixed for a given simulation by parameter time,
    • time : hour, the entered value have to correspond to defined range of activityit(time) function,
    • Protection distance - the minimum distance between IT and VR;
  • Closest : each interfering signal calculation results from the contribution of just one interfering transmitter. This ILT is randomly placed in a circular area, the radius of which (called simulation radius) is automatically derived from the density and activity of transmitters (see the Interferers density panels). In this mode, required parameters are the same as described above for the Uniform density mode, except that you can not set multiple number of ITs;
  • Corr (victim link -> ILT) : fixed placement of the ILT either with respect to VLR or VLT.
  • Corr (victim link -> ILR) : fixed placement of the ILR either with respect to VLR or VLT.

Interferers density

The panel is activated if "Uniform" or/and "closest" is selected.

Pathloss correlation

The panel is activated if the victim is either OFDMA UL or OFDMA DL.

Propagation Model

This is the loss on the path between the ILT and the VLR: you can choose the suitable propagation model to be applied when calculating signal loss along the ILT-VLR path (when calculating unwanted or blocking signal - iRSS). Please see the separate information pages regarding the choice and settings of the propagation models.

Transmitter to Victim Link Tansmitter Path (ILT -> VLT)

This tab is only activated if the interfering transmitter is a cognitive radio system. 2 elements characterised the path between the ILT -> VLT.


  • Spectrum sensing characteristics (more information on the CR algorithm)
    • Detection Treshold
    • Propability of failure
    • Sensing reception bandwidth
    • e.i.r.p. max In-block limit
  • Propagation Model: you can choose the suitable propagation model to be applied when calculating signal loss along the ILT-ILR path. Please see the separate information pages regarding the choice and settings of the propagation models.

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