Last modified 2 years ago
You are here: Manual / Algorithms / Basics / Antenna Gain
TracNav
SEAMCAT Manual Table of contents
- About this Wiki
- About the STG (SEAMCAT Technical Group)
- About the source code
- Frequently Asked Questions
- How to register on TracTool?
- Tutorial videos
- Known Issues
- Disclaimer
Introduction
Main structural elements of SEAMCAT
Data elements
- SEAMCAT Data types
- Function entry dialog window
- Emissions mask dialog window
- Random distribution dialog window
- Antenna pattern dialog window
- Signal display window
- How to generate a truncated distribution?
Simulation workspace
Creating SEAMCAT scenario
- Simulation scenario and its programming
- Victim link dialog window
- Interfering link dialog window
- CDMA system dialog window
- Sharing and importing scenarios
CDMA module
- CDMA Module Overview
- CDMA Simulation Engine (CDMAE)
- CDMA system dialog window
- CDMA Link level data
- CDMA simulation algorithm
- CDMA input parameters
- CDMA output results
OFDMA module
Cognitive Radio System module
Performing a simulation
- Simulation control settings
- Running a simulation (event generation)
- Calculating probability of interference
Simulation results...
- Producing simulation report
- Logging options and Remote server
- Saving results in .csv format
Library of scenario elements
- SEAMCAT Library
- Antenna elements
- Receiver elements
- Transmitter elements
- CDMA Link level data
- Propagation model plugins
- Post processing plugins
- Setting up environment for programming plugins
- Exporting and importing a library
Special functions
Detailed algorithms
- Calculation of wanted signal (dRSS)
- Calculation of unwanted and blocking signals (iRSS)
- Calculation of overloading (iRSS)
- Calculation of intermodulation signal (iRSS)
- Interference calculation (non-CDMA/non-OFDMA)
- CDMA simulation algorithm
- OFDMA simulation algorithm
Elementary calculations
- Relative location of VR and IT (Simulation Radius)
- Relative location of transceivers within a link
- Calculation of azimuths and elevations (within a link)
- Calculation of azimuths and elevations (IT-VR path)
- Calculation of antenna gains
- Calculation of VR blocking attenuation
- Calculation of the coverage radius of a transmitter
- Calculation of IT power control gain
- Calculation of IT (unwanted) emissions
Propagation models
- Guide to propagation models in SEAMCAT
- How to test propagation model?
- ITU-R P.1546 model
- Extended Hata and Hata-SRD models
- Spherical diffraction model
- Free Space Loss model
- User-defined model (Propagation plug-in)
- JTG5-6 propagation plug-in
- SE42 propagation plug-in
- Longley Rice propagation plug-in
- Winner propagation plug-in
- IEEE 802.11 Model C (modified) plug-in
Reference annexes
- Setting antenna height, pointing azimuth and elevation
- Setting path azimuths in links
- Setting blocking attenuation of victim receiver
- Scenario consistency check
- Error and warning messages
Example Scenarios
Release to be tested by STG
Calculation of antenna gains
It is assumed that the frequency has no impact on antenna efficiency/gain, therefore antenna gains are calculated based on pure peak gain combined with necessary angular discrimination in case of directional antennas (i.e. antennas having radiation patterns assigned in the scenario).
The calculation of the antenna gain for a path between transceiver trx1 and transceiver trx2 is performed as follows.
Case A: If no spherical antenna pattern is defined:
- Gain in horizontal plane: if horizontal antenna pattern is defined, then
- Gain in vertical plane: if vertical antenna pattern is defined, then:
- When the two antenna patterns (horizontal and vertical) are selected, SEAMCAT calculates the resulting antenna gain as a pseudo 3-D antenna gain .
The calculation is based on the following approximation with a treshold value of 3 dB: 
Case B: If spherical antenna pattern is defined:
- The spherical-angle gain is calculated:
- Total gain is then calculated as follows:
Attachments
-
img1.gif
(2.0 KB) -
added by cp 4 years ago.
-
img2.gif
(2.0 KB) -
added by cp 4 years ago.
-
img3.gif
(2.0 KB) -
added by cp 4 years ago.
-
img4.gif
(2.0 KB) -
added by cp 4 years ago.
-
img5.gif
(2.0 KB) -
added by cp 4 years ago.
-
combine_antenna_gain.gif
(5.2 KB) -
added by jean-philippe 3 years ago.
-
total_antenna_gain_equation.gif
(5.2 KB) -
added by jean-philippe 2 years ago.
