Annex 1 Minimum usable field strengths for digital
sound broadcasting (DSB) (Digital Radio Mondiale (DRM) system) at frequencies
below 30 MHz
1 Introduction
2 Relevant transmission parameters
2.1 DRM robustness modes
2.2 Spectrum occupancy types
2.3 Modulation and protection levels
3 Computation of minimum usable
field strength
4 Further remarks
Appendix 1 to Annex 1 Procedure
for estimation of the minimum usable field strength
2 Receiver sensitivity
3 Other factors to be considered
Appendix 2 to Annex 1 Required S/N
ratios for DRM reception
1 Introduction
2 S/N
values for LF/MF bands
3 S/N
values for HF bands
Appendix 3 to Annex 1 Prediction
and modelling of radiowave propagation
for DSB at frequencies below 30 MHz
1 Introduction
2 Prediction of HF sky-wave
propagation
3 Prediction of MF ground- and
sky-wave propagation
4 Modelling of propagation
channels
Annex 2 RF protection ratios for
DSB (DRM system) at frequencies below 30 MHz
1 Introduction
2 RF protection
ratios
3 RF power reduction for DSB
Appendix 1 to Annex 2 Calculated
RF protection ratios for DSB (DRM system)
at frequencies below 30 MHz
1 Introduction
2 Calculation parameters
2.1 Analogue signal
2.2 DRM signal
3 RF protection ratios
Appendix 2 to Annex 2 Method of
measurements and determination of RF protection ratios
1 Method of measurements in
accordance with Recommendation ITU-R BS.559
1.1 Calculation method
1.2 RF power relationship AM/digital
1.3 Receiver characteristics
1.3.1 AM receiver selectivity curve
1.3.2 Digital receiver: required S/I
1.4 Use of the DRM spectrum mask
1.5 Frequency separations
2 Determination of RF protection
ratios for DSB in the broadcasting bands below 30 MHz
2.1 Introduction
2.2 Calculation model
2.2.1 Calculation method
2.3 Transmitter model
2.4 Receiver model
2.5 Future extension of the
calculation model
3 Assumed system parameters
3.1 Spectrum masks
3.2 AM transmitter (Figs. 5 to 8)
3.3 AM modulation (Figs. 5 to 7)
3.4 AM receiver (Figs. 11a and 11b)
3.5 Transmitter for digital signals
3.6 Digital modulation (Figs. 9a and
9b)
3.7 Receiver for digital signals
(Fig. 9a)
4 Verification of calculation
method
5 Application for digitally
modulated signals
6 Summary
Annex 3 Measured RF protection
ratios for IBOC (in band on-channel) DSB system in the MF band
1 Introduction
2 RF protection ratios
3 Channel spacing
4 Night-time and considerations
for sky-wave protection
5 Conclusion