wiki:Manual/Scenario/VictimLink

You are here: Manual / Scenario / VictimLink dialogue

TracNav


Victim link Tab

This tab allows you to update all scenario parameters of victim link transceivers: victim link receiver (VLR) and victim link transmitter (VLT).

Each simulation workspace must contain one and only one victim link. When creating a new simulation workspace, the victim link is automatically created and initialised with some default parameters.

You can directly edit the victim link of the current workspace by selecting the Victim Link tab.

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


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 enter the frequency and you can also predefined the dRSS distribution that you want. When the User-defined dRSS (dBm) is selected, you have to set the value of wanted signal (dRSS) through the associated data entry field. In this case the EGE will override the dRSS simulation and will substitute the dRSS values by the results of trialling the user-defined dRSS distribution data. This way of defining dRSS is often used e.g. when victim link is deliberately set to operate at or close to victim receiver's sensitivity threshold, etc.

You have access to 3 sub tabs to set the victim link.

  • Receiver (VLR)
  • Transmitter (VLT)
  • Transmitter to Receiver Path (VLT -> VLR)

Victim Link Receiver (VLR)

5 panels form the necessary information to fill in for setting the victim link receiver.


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.

Receiver 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 (may be freely edited by the user)
  • Antenna peak gain (dBi) and pattern selectors. See separate guidance on the the radiation pattern.

Reception characteristics

  • Noise floor distribution (dBm)
  • Blocking mode and associated blocking mask - please see the separate page with guidance on how to define Blocking and How to calculate blocking
  • Intermodulation rejection (dBm)
  • Receive power dynamic range (dB)
  • Sensitivity (dBm)
  • Reception bandwidth (kHz)
  • overloading please see the separate page with guidance on how to calculate overloading
    • overloading threshold (dBm)
    • Receiver filter (dB)

Interference criteria

Note that consistency between these three values is under the responsibility of the user and that only one at a time is used in the interference calculation.

  • C/I (dB)
  • C/(N+I) (dB)
  • (N+I)/N (dB)
  • I/N (dB)

It is important to remember that these parameters are also used in the evaluation of the 2 following blocking modes, therefore it is important that they are consistent with one another

  • Protection ratio: Avr_ProtectionRatio=Bmask + C/(N+I) + (N+I)/N – I/N
  • Sensitivity: Avr_sensitivity = Bmask– sensitivity_receiver + C/(N+I) - I/N

Note: Consistency check between interference criteria is performed prior to simulation. Due to the non additive formula linking these parameters a tolerance of 0.5 dB is to be used.

Victim Link Transmitter (VLT)

This is valid if the User-defined dRSS (dBm) is not selected. 4 panels form the necessary information to fill in for setting the victim link transmitter.


Transmitter identification

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

Transmitter antenna pointing

It contains all information relative to the antenna other than the radiation pattern. It is the same panel as for the receiver antenna pointing. It points, in azimuth and in elevation, towards the VLR.

Antenna patterns identification

It contains all information relative to the antenna radiation pattern. It is similar to the receiver antenna patterns identification.

Emission characteristics

  • transmit power (dBm), may be set constant or random value.
  • interferer is CR. You need to activate it if the interferer is a Cognitive Radio (CR). It will allow you to set the following parameters used in the CR computation:
    • spectrum emission mask for the VLT
    • emission floor

Transmitter to Receiver Path (VLT -> VLR)

3 elements form the path between the VLR and the VLT.


Relative location

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

  • When the Correlated distance option is checked, it means that the positions of VLR and VLT are fixed with respect to each other, and you can enter dX/dY distances from VLT to VLR (VLT is considered a reference centre);
  • When the correlated distance is unchecked, it means that VR is randomly moving around VLT and the two parameters define the range of this random movement:
    • Path azimuth (deg) - describes the azimuthal direction of possible VR locations as seen from VLT.
    • Path distance factor (times) - describes the extent of possible VR locations in terms of distance. 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 VLR-VLT 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 user 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 user 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 VLT-VLR path (useful signal dRSS). Please see the separate information pages regarding the choice and settings of the propagation models.

Attachments