CONTENTS

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