wiki:Manual/PropagationModels/JTG56

You are here: Manual / PropagationModels / JTG 5-6 propagation plug-in

TracNav


JTG 5-6 propagation model plugin

A video decribing how to install the plug-in is available here (8 MB - note: the sound is fading towards the end.)

Introduction

A propagation model (as developed in  JTG 5-6) has been implemented as plugins for SEAMCAT. This model has been tested for two types of interpolation versus values given by the EBU (European Broadcasting Union). Calibration results are presented on this page.

The plugins (.class) and their source codes (.java) are freely downloadable from this page.

Interpolation ambiguity

In parallel to the development of the JTG 5-6 plugins for CPG PTD, similar activities in SE42 (CEPT project team under WGSE closed in 2010) were on-going and in the course of the development of the plugins an ambiguity was found with respect to the interpretation of the interpolation between 100 m and 1 km and the 40 m to 100 m (see details here).

Therefore, there was a need to develop two plugins to be made available based on the following figure:

  • JTG56_P1546SEAMCAT.class (based on the WP3K/JTG 5-6/54 document) where the interpolation is between the local Hata and P1546_1km and where the loss is max of (interpolated value, free space)). This is equivalent to the red curve of the illustrative figure.

  • ModJTG56_P1546SEAMCAT.class (same as above but with a modification to the interpolation as agreed in SE42 where the interpolation is made between max(hata,free space) and P1546_1km and loss is directly the interpolated value. Finally the loss is max (loss, free space). This is equivalent to the green curve of the illustrative figure.

In June 2012, SEAMCAT 4 provided new plugin capabilities which allowed to combine the two plugins in one.

Download and testing of the plugins

The plugins are available in a .zip file containing the source code .java and the executable .class)

Version ver.4 ver.5
Date 02/07/2012 21/06/2013
JTG56 download here (Compatible SEAMCAT 4.0.0 and onward) (zip file containing .java, .class and .jar) download here (Compatible SEAMCAT 4.0.0 and onward) (zip file containing .java, .class and .jar)
Testing The two plugins are merged into one (see history bellow).
The calculation is unchanged
The path loss is bounded by the freespace loss. The standard deviation is added to it afterwards. With this version you are now able to apply reciprocity in the antenna height.
Note that the combination of low antenna height (i.e. 1.5 m) for both Rx and Tx should be limited to small distances as this combination is not valid for the P1546. A difference of maximum 0.35 dB is to be expected compared with version 3
Compatibility compatible SEAMCAT 4.0.0 and onward (previous SEAMCAT versions do not support this version) compatible SEAMCAT 4.0.0 and onward (previous SEAMCAT versions do not support this version)

Assumptions on the Plugin to CPG PTD (-> JTG 5-6):

  • environment: “rural”, “suburban”, “urban”.
  • Outdoor to outdoor - Frequency : implemented to varie from 600 MHz to 2000 MHz as indicated in 3K/54.
  • Tx Antenna heights (H_Tx): 30 m to 200 m
  • Rx antenna heights (H_Rx): 1.5 m to 10 m
  • standard deviation (stddev): hard coded value of 5.5 dB for all distances if H_Rx > clutter height. If H_Rx < clutter height and if H_Tx < Clutter height, the stddev = 7 dB (for all the distances). The use of hard coded value means that the shadowing effect is always activated.
  • time probability: 50 % and 1% for the interfering path. (P.1546)

Note on assumptions

  • This plugin considers a limitation to free space in all cases (i.e. both Hata (ITU-R Report SM.2028-1) and P.1546-3 (ITU-R Recommendation P.1546-3))
  • In the current plugin, the correction factor in eq.29 of section 10 of Annex 5 of Rec ITU-R P.1546-3 has been removed. This equation is not discussed in 3K/54.
  • Since in Annex 7 to Document 5-6/53 the environment (i.e. Urban, Suburban and Rural) are within square brackets, it was decided to be generic in the implementation of the plugins and to include the all cases by using the same frequency correction factor as the already existing built in SEAMCAT hata model.
  • The models that are used in the plugin are only for outdoor – outdoor scenario.

How to load and use the plugins

Load the .class file or the .jar file (to allow embeddement) on your SEAMCAT plugin folders (see plugin section with embeddement)

The interface is self explanatory (note the usage of tooltips)

Archive

version history

Below is the history of the various version made available. These versions can be considered as obsolete.

Version Plugins obsoletePlugins obsoletePlugins revised after WP3K inputPlugins revised to allow webstart use - ver.2ver.3
date 14/04/2009 01/05/2009 17/09/200909/06/201022/12/2011
JTG56_P1546SEAMCAT download here (obsolete) download here (obsolete) download here (obsolete) download here (obsolete) download here (obsolete)
ModJTG56_P1546SEAMCAT download here (obsolete) download here (obsolete) download here (obsolete) download here (obsolete) download here (obsolete)
Testing The ERO has performed a set of testing and calibration of the plugins by comparing results kindly provided by the EBU. Detailed results can be found here. After revision of the plugins (1st May 2009) a second test was performed. Details results can be found here. WP3k proposed changes to JTG5-6. ECO updated the plugins. Details results can be found here. ECO updated the plugin so that it is compatible for .msi and webstart. The calculation is unchangedA correction was made for the lowest antenna height that caused to crash. it is now 1 m instead of 0 m - The calculation is unchanged
Compatibility compatible 3.1.47 (.msi only)compatible 3.1.47 (.msi only)compatible 3.1.47 (.msi only) compatible 3.2.1 and onward (previous SEAMCAT versions do not support the fix) compatible 3.2.1 and onward (previous SEAMCAT versions do not support this version)

Note on the old (obsolete) plugin interface (Ver. 3 and backward)

Note on usage

  • Parameter 1: time probability should either be 1 (for 1%) or 50 (for 50% ). (The time probability interpolation between 1% and 50% is not yet supported)
  • Parameter 2: cut off distance (set by default to 40 m) for the interpolation between Freespace at cutoff distance and Hata at 100 meters.
  • Parameter 3: change in the cluter height (dense urban). If local enviroment is Rural or Sub-Urban local clutter height equals 10 by default and Urban equals 20 by default. Any value other than 0 will overwrite them. So for the small urban as in SE42 select URBAN and localClutterHeight = 10 m.

To use the plugin:

  1. Select “plugin” from the propagation model selection (contrary from a built in model)
  2. Select the plugin to use
  3. Select the environment: Rural/suburban/urban
  4. Parameter 1: timeprobability should either be 1 (for 1%) or 50 (for 50% ). (The time probability interpolation between 1% and 50% is not yet supported)
  5. Parameter 2: distanceCutOff (by default it is 40 m)
  6. Parameter 3: localClutterHeight. If local enviroment is Rural or Sub-Urban local clutter height equals 10 by default and Urban equals 20 by default. Any value other than 0 will overwrite them. So for the small urban as in SE42 select URBAN and localClutterHeight = 10 m.

Attachments