|
|
Application
|
|
The new Digital Video Broadcasting Standard (DVB-SH) aims to provide
multimedia services to the mobile user on a cost-effective way by the
interworking of satellite systems with 3G
and Beyond 3G terrestrial networks.
AWE Communications continues with the development of a planning tool
for DVB-SH considering the satellite as well as the terrestrial
repeater
segment in the framework of the ORTIGIA
project. The basis of the tool development was achieved in the MAESTRO
project in the sixth framework programme (see
press release). Further collaborative partners include ESA
and CNES.
The DVB-SH radio network planning tool allows the investigation of the
network performance in terms of coverage, SNIR and system margin for
different satellite and terrestrial repeater configurations within
various environments (rural,
urban,
and indoor).
|
Structure
of the DVB-SH RNP tool
|
|
|
Propagation
|
|
Based on the accurate prediction of the satellite and
repeater (gap-filler) links in terms of path loss delay profiles by
using deterministic ray-optical
wave propagation models the defined DVB-SH network is evaluated.
The
calculation of the different path loss delay profiles forms the basis
for the DVB-SH system simulation.
Satellite Transmitters:
For the wave
propagation analysis of the satellite signals two
different approaches are possible:
As an example for an
urban scenario the following figures describe
|
|
LOS
visibility from satellite
(LOS
given in green)
|
Prediction
of received power
from
satellite (in user terminal)
|
Terrestrial
Repeaters:
The wave propagation
of the terrestrial repeaters is computed with the rural/suburban and urban propagation models
included in ProMan.
|
|
|
Network
Planning
|
The DVB-SH system
simulator includes a detailed modelling of the DVB-SH architecture
(satellite segment, repeater segment, user terminal segment). In the
simulator the different parameters influencing the link budget are
considered and the OFDM air interface
is modeled in a detailed manner (with different parameters like guard
interval). By taking into
account the predicted path loss delay profiles of the corresponding
satellite and repeater links, different performance measures are
calculated.
|
Features of network
planning module:
- Consideration of downlink
-
Consideration
of link budget for each contribution (adaptation of power
and delay)
-
Sort
contributions (satellite, repeaters) according to delay
-
Define
OFDM receiver according to given parameters
-
Evaluation
of C/N and SNIR ratios for different receiver types (portable/mobile)
|
Simulated
SNIR coverage
|
|
|
Databases
|
|
The propagation models in WinProp work with many different types of
databases depending on the scenario which is analyzed (e.g. topography, clutter or building data). Further
information concerning the databases can be found on the database page.
|
|
|
DVB-SH
Radio Network Planning Tool - A Hybrid Challenge
|
|
As the satellite coverage is extended with terrestrial repeaters (see
figure), the planning tool must consider not only satellites or terrestrial transmitters. It must
work with both, satellites and
terrestrial transmitters. Especially the interference between satellite
and terrestrial network makes it complicated to plan the broadcasting
network.
The radio planning tool of AWE Communications is designed for the
handling of such hybrid networks. The number of
repeaters (depending on their configuration) can be determined in order
to achieve coverage over an urban area, but also on nation-wide scale.
Improvements of the indoor coverage
due to terrestrial repeaters can be simulated.
|
|
|
|
|
|
|
Brochure with
information about the DVB-SH module.
|
|
|
Application note to DVB-SH
Radio Network Planning.
|
|
|
Presentation of the DVB-SH
Planning Tool.
|
|
|
|
|
Read
more about satellite propagation.
|
|
|
|
|
Read
scientific publications related to DVB-SH.
|
|
|
|
Our partners in DVB-SH:
(alphabetical order)
|
DVB-SH activities co-funded by
EU IST/FP6 project
|
|
