Policy on Intellectual
Property Right (IPR)
Introduction
1 Objectives
1.1
Why digital? − Technical considerations
1.2
Why digital? − Commercial and operational considerations
1.3
How digital? − Technical and operational considerations
1.4 How
digital? − Commercial considerations
2 DRM system
aspects
2.1
Key features of the system design
2.2 Audio
coding guidelines
2.3 Transmission
modes and data rates
2.3.1 DRM
robustness modes
2.3.2 Spectrum occupancy types
2.3.3 DRM
theoretical data rates
3 Modification of
transmitters and antennas
3.1 Principles
of modifying existing transmitters − conversion to digital
3.2 Converting
different types of transmitter to DRM
3.3 Coverage
efficiency
3.4 The
experience of Vatican Radio
3.4.1 Modern solid-state
MW transmitter
3.4.2 PDM SW transmitter
3.4.3 First-generation
(GTO) PSM MW transmitter
3.4.4 Modern PSM (IGBT)
SW transmitter
3.5
Spectrum mask
3.6 Antenna
constraints
Load impedance bandwidth:
4 Coverage and
frequency planning
4.1
Introduction
4.1.1 Minimum usable
field strength
4.1.2 Protection criteria
4.2
LF/MF bands
4.2.1 Frequency bands allocated
to LF and MF sound broadcasting
4.2.2 Coverage
4.2.3 Propagation
Influence of width of the streets
Attenuation occurrences due to specific urban elements
4.2.4 Frequency choice
and coordination
4.2.5 Reception
Use of the electrical field for reception
Use of the magnetic field for reception
Use of the electrical field for reception
Use of the magnetic field for reception
4.2.6 Planning software
4.3
HF band
4.3.1 Coverage
4.3.2 Protection ratios
4.3.3 Propagation
4.3.4 Frequency choice
and coordination
4.3.5 Reception
4.3.6 Planning software
4.4
Required S/N ratios for DRM reception
4.5
Minimum usable field-strength values for planning
4.5.1 Procedure for
estimation of the minimum usable field strength
4.5.2 Computation of
minimum usable field strength
4.5.3 Feedback from field
tests
4.6 RF protection
ratios
4.6.1 Relative protection ratios
4.6.2 Values of relative
protection ratios
4.6.3 RF protection
ratios used for HF coordination
4.6.4 RF power reduction
for DRM
4.7
The specific case of the 26 MHz band
4.8 Simulcast
4.9 NVIS
4.10
Example of SFN use in broadcasting below 30 MHz
4.10.1 System setup
4.10.2 Stand-alone versus
SFN transmitter operation
4.10.3 Long-term test
4.10.4 Conclusion
5 International
regulations
5.1
The planning process: assignment planning for LF/MF
5.1.1 Special study
regarding the use of digital modulation in the LF and MF bands governed by the
Regional Agreements GE75, RJ81 and RJ88
5.1.2 Regulatory
considerations
5.1.3 Regional Agreement
GE75
5.1.4 Regional Agreement
RJ81
5.1.5 Regional Agreement
RJ88
5.2
Coordination for HF
5.2.1 The HFBC framework
5.2.2 The RR
Article 12 procedure
6 Conclusions
6.1
DRM is already operational
6.2
Technical and regulatory information related to DRM services
coverage planning that are compiled in this text
6.3
Feedback from operational and experimental transmissions is
available
6.4
And next …
7 List of terms
(abbreviations)
Annex 1 Required S/N values for DRM reception
1 S/N
values for LF/MF bands
2 S/N
values for HF bands
Annex 2 Information related to RF protection ratios
1 Introduction
2 Calculation
parameters
2.1
Analogue signal
2.2
DRM signal
2.3
Values for RF protection ratios 73
Annex 3 Results of some DRM trials
1 DRM test in the
MF band in Madrid
2 DRM test in the
MF band in Mexico City
Source: Document WP 6E/403
3 DRM/AM simulcast
tests at MW in Mexico
Sources: DRM: MW simulcast tests in Mexico City, Document 6E/403, DRM
developments: Experimental and Regular Transmissions
4 DRM test in the
MF band in Italy
Source: Document ITU-SG 6/353
Global results
5 DRM trials in India:
simulcast MW, Tropical Band NVIS and 26 MHz local broadcasting
Source: Document 6D/10
6 Multichannel
Simulcast, urban and indoor reception in MW Band
Source: Document 6A/73
Annex 4 RMS modulation depth
Annex 5 DRM facilities and transmissions operated by European
Broadcasters