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Victim link dialog window

This dialog window is provided for updating all scenario parameters of victim link transceivers: victim receiver (VR) and wanted transmitter (WT).

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.

To edit the victim link of the current workspace select the Victim Link command in the Workspace menu. This activates the Victim link window.

General

OBS: If the Victim Link is a CDMA system, set the distribution frequency and check the box 'Victim system is CDMA system', this will activate a special set of tabs allowing to define parameters of CDMA system.

The rest of this page deals with settings for non-CDMA victim links. The General parameters tabsheet gathers basic information required for definition of a victim link:

• Link identification (freely chosen reference name and description);

• Victim receiver combo box allows to select one of the pre-defined Library receivers. This parameter is set by default (when the workspace is created) to the reference of the first available receiver of the database. Note that any change of the reference of the VR through this combo box automatically triggers the update of the associated parameters of the victim link;

• Frequency (MHz) of the victim link.

As far as the WT definition is concerned, two modes are available:

• Either select the wanted transmitter option: in this case the SEAMCAT will generate the WT and will calculate the dRSS signal according to actually simulated link budget. The Wanted transmitter combo box allows to select one of the pre-defined Library transmitters as WT. This parameter is set by default (when the workspace is created) to the reference of the first available transmitter of the database. Note that any change of the reference of the WT through this combo box automatically triggers the update of the associated parameters of the WT of victim link;

• Or select the User-defined dRSS (dBm) option. In this case the user has 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.

Victim Receiver (VR)

The Victim receiver tabsheet allows to enter parameters defining the VR:

General

The General sub-sheet contains following information about VR:

• Identification
  • Name (may be freely edited by the user),
  • Description (may be freely edited by the user),

• Reception characteristics field:
  • Sensitivity (dBm),
  • Reception bandwidth (kHz),
  • Noise floor distribution (dBm),
  • Blocking attenuation mode and associated blocking response function - please see the separate page with guidance on how to define Blocking;
  • Intermodulation rejection (dBm).

• Interference criteria (dB) field - 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. It is also possible that user defines only one of these parameters, the one which is intended to be used in interference calculations:
  • C/I
  • C/(N+I)
  • (N+I)/N
  • 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.

• VR Antenna pointing
  • Antenna height distribution (m),
  • Antenna azimuth distribution (°),
  • Antenna elevation distribution (°).

Antenna

The Antenna sub-sheet contains all information relative to the antenna of the VR:

• Antenna reference (may be freely edited by the user)
• Antenna description (may be freely edited by the user)
• Antenna peak gain (dBi) and pattern selectors.

Wanted Transmitter (WT)

Wanted transmitter tabsheet allows to enter parameters defining the WT:

General

The General sub-sheet contains following information about WT:

• Identification
  • Name (may be freely edited by the user),
  • Description (may be freely edited by the user),

• WT Antenna pointing: 
  • Antenna height distribution (m),
  • Antenna azimuth distribution (°),
  • Antenna elevation distribution (°),

• WT transmit power (dBm), may be set constant or random value.

Antenna

The Antenna sub-sheet contains all information relative to the antenna of the WT:

• Antenna reference (may be freely edited by the user)
• Antenna description (may be freely edited by the user)
• Antenna peak gain (dBi) and pattern selectors.

WT-VR path definition

The WT-VR path tabsheet allows to enter parameters defining the modeling of WT-VR path:

• mutual physical positioning of WT and VR;
• propagation loss modeling on WT-VR path.

Relative Location

The Relative location sub-sheet allows user to define the mutual positioning of WT and VR:

• Relative location field gives user two primary options to define type of mutual placement of VR with respect to WT:
  • When the Correlated distance option is checked, it means that positions of VR and WT are fixed with respect to each other, and the user enters dX/dY distances from WT to VR (WT is considered a reference centre);
  • When the correlated distance is unchecked, it means that VR is randomly moving around WT 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 WT. (Please read here about path azimuth settings);
    • 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.

• Coverage radius field gives user possibility to define the maximum range of VR-WT placement when they are placed in non-correlated fashion:
  • User-defined radius option allows user to enter the maximum radius directly below;
  • Noise-limited network option will calculate the coverage radius at the beginning of the EGE cycle, based on 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 at the beginning of the EGE cycle, based on 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.

Propagation Model

The Propagation model sub-sheet allows user to choose the suitable propagation model to be applied when calculating signal loss along the WT-VR path (useful signal dRSS). Please see the separate information pages regarding the choice and settings of the propagation models.