- 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
Main structural elements of SEAMCAT
- SEAMCAT Data types
- Function entry
- Emissions mask
- Random distributions
- Signal vectors
- How to generate a truncated distribution?
Creating SEAMCAT scenario
- Simulation scenario and its programming
- Victim link tab
- Interfering link tab
- Sharing and importing scenarios
Performing a simulation
- Simulation control settings
- Running a simulation (event generation)
- Calculating probability of interference
- Simulation results overview
- Generic system results
- Simulation report
- Logging options and remote server
- Saving results format
- CDMA system tab
- CDMA Link level data
- CDMA simulation algorithm
- CDMA input parameters
- CDMA output results
Cognitive Radio System module
Library of scenario elements
- Library overview
- Antenna elements
- Spectrum emission mask elements
- Receiver blocking mask elements
- Receiver elements
- Transmitter elements
- CDMA Link level data
- CDMA-OFDMA network
- Propagation model plugins
- Post processing plugins
- 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
- Wanted signal (dRSS)
- Unwanted and blocking signals (iRSS)
- Overloading (iRSS)
- Intermodulation signal (iRSS)
- CDMA simulation algorithm
- OFDMA simulation algorithm
- Location of VLR with ILT (Simulation Radius)
- Location of VLR and ILR (Coverage radius)
- Azimuths and elevations (IT-VR path)
- Azimuths and elevations (within a link)
- Blocking attenuation (VLR)
- unwanted emissions (ILT)
- Power control gain (ILT)
Release to be tested by STG
Calculation of antenna azimuths and elevations within a link
Deriving both dRSS and iRSS signals (as well as internal calculation of signal strength between ILT-ILR for the purpose of power control operation) requires the calculation of the relative antenna azimuths and elevations between transceivers of the same link.
For all angle calculations:
- the azimuth reference is either the transmitter - receiver path or the EAST direction
- the elevation reference is the horizontal plane or the transmitter - receiver path
- Trial of the receiver antenna azimuth
- Trial of the receiver antenna tilt
- Calculation of receiver antenna azimuth
- Calculation of receiver antenna elevation derived from both tilt and the azimuth angles
The transmitter antenna azimuth and elevation in the direction of the peer-receiver are calculated using the same above-described algorithm, by swapping tx and rx variables.
2. How to set antenna height, pointing azimuth and elevation?
The Antenna pointing panels allows you to set:
The 'height of the antenna should correspond to its definition in the selected propagation model for that link (e.g. it might be the height above ground, effective height or height above local clutter).
The antenna pointing azimuth reference: In SEAMCAT you have two options to set the reference of the antenna pointing (). The antennas can either be pointing, i.e. the direction of the main beam is towards the Rx or the Tx, or be de-pointing, i.e. the direction of main beam is by default towards EAST. The control of the pointing and de-pointing of the antenna is only between the pair (VLT, VLR), and (ILT, ILR). The principle is illustrated in the two graphics below (for the victim link).
|In this example, the VLR antenna is pointing towards the VLT by default (red arrow). You can then set a specific aziumuth angle in order to steer the antenna away from the default reference. It is set to 0 in the illustration. This parameter may be used either to add certain variable parameter to the final link budget due to random de-pointing of antennas (e.g. in mobile environment), or to show deliberate de-pointing of antenna (e.g. choosing a particular gain point on the antenna directivity pattern).||In this configuration, the "antenna azimuth" is set to 10 deg, which results in the main beam to be sligtly shifted from the EAST direction.|
|Calculation azimuth reference is the transmitter - receiver path||Calculation azimuth reference is EAST|
In this case the antenna are pointing at each other.
In this case the antenna are not pointing at each other and they are looking EAST.
The antenna pointing elevation reference follows the same concept as for "antenna pointing azimuth". When selected, the antennas are pointing toward the opposite transceiver of the same link. If it is not selected, it means that the antenna reference is fixed to the horizontal plane.
The antenna elevation: It allows you to steer the antenna to a certain angle with respect to the antenna pointing elevation reference. Adding the antenna elevation component allows you to simulate a real life antenna down-tilt or up-tilt. It is .
Note 1: De-pointing feature, is very useful to simulate beamforming for instance.
Note 2: Unless some intentional meaning of antenna de-pointing is foreseen in simulation scenario, it is recommended to always set the antenna pointing and elevation angle parameters to const=0, meaning that the main beam of the antenna is directed towards the corresponding pair transceiver in a link.
3. Conventions for angle definitions
- Azimuth angle: positive = counter-clockwise to the 0 deg reference
- elevation angle: positive = up-tilt to the 0 deg reference and negative = down-tilt to the 0 deg reference
- antenna_pointing.gif (6.4 KB) - added by jean-philippe 11 months ago.
- azimuth_pointing.gif (19.1 KB) - added by jean-philippe 11 months ago.
- azimuth_depointing.gif (20.0 KB) - added by jean-philippe 11 months ago.
- elevation_depointing.gif (22.7 KB) - added by jean-philippe 11 months ago.
- elevation_pointing.gif (22.2 KB) - added by jean-philippe 11 months ago.
- azimuth_convention.gif (4.7 KB) - added by jean-philippe 11 months ago.
- elevation_convention.gif (6.3 KB) - added by jean-philippe 11 months ago.
- path_azimuth.png (11.6 KB) - added by jean-philippe 11 months ago.
- reference_pointing.gif (1.7 KB) - added by jean-philippe 10 months ago.
- azimuth.gif (1.8 KB) - added by jean-philippe 10 months ago.
- azimuth_eq1.gif (2.1 KB) - added by jean-philippe 10 months ago.
- azimuth_eq2.gif (3.1 KB) - added by jean-philippe 10 months ago.
- azimuth_trial.gif (1.8 KB) - added by jean-philippe 10 months ago.
- elevation2.gif (1.8 KB) - added by jean-philippe 10 months ago.
- elevation_tilt.gif (1.8 KB) - added by jean-philippe 10 months ago.
- elevation_eq1.gif (2.1 KB) - added by jean-philippe 10 months ago.
- elevation_eq2.gif (3.0 KB) - added by jean-philippe 10 months ago.
- alpha.gif (1.6 KB) - added by jean-philippe 10 months ago.