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IBOC AM Transmission Specification Ibiquity Digital Corporation IBOC AM Transmission Specification November 2001 iBiquity Digital Corporation 8865 Stanford Boulevard, Suite 202 20 Independence Boulevard Columbia, Maryland 21045 Warren, New Jersey 07059 AM Transmission Specification © 2001 iBiquity Digital Corporation 11/08/01 Doc. No. SY_TN_5010 Rev. 01 (410) 872-1530 (908) 580-7000 Table of Contents Contents 1 SCOPE ..............................................................................................................................................................1 2 ABBREVIATIONS, SYMBOLS, AND CONVENTIONS .................................................................................1 2.1 Introduction ...............................................................................................................................................1 2.2 Abbreviations and Acronyms ....................................................................................................................1 2.3 Presentation Conventions ..........................................................................................................................1 2.4 Mathematical Symbols ..............................................................................................................................1 2.4.1 Variable Naming Conventions ..............................................................................................................1 2.4.2 Arithmetic Operators.............................................................................................................................1 2.5 AM System Parameters .............................................................................................................................1 3 IBOC LAYERS..................................................................................................................................................1 3.1 Introduction ...............................................................................................................................................1 3.2 Waveforms and Spectra.............................................................................................................................1 3.2.1 Hybrid Waveform .................................................................................................................................1 3.2.2 All Digital Waveform............................................................................................................................1 3.3 System Control Channel............................................................................................................................1 3.4 Logical Channels .......................................................................................................................................1 3.4.1 Functional Components.........................................................................................................................1 3.4.2 L1 Service Access Point........................................................................................................................1 3.4.3 Scrambling ............................................................................................................................................1 3.4.4 Channel Encoding .................................................................................................................................1 3.4.5 Interleaving ...........................................................................................................................................1 3.4.6 System Control Processing....................................................................................................................1 3.4.7 OFDM Subcarrier Mapping ..................................................................................................................1 3.4.8 OFDM Signal Generation .....................................................................................................................1 3.4.9 Transmission Subsystem .......................................................................................................................1 4 FUNCTIONAL DESCRIPTION.........................................................................................................................1 4.1 Introduction ...............................................................................................................................................1 4.2 Functionality..............................................................................................................................................1 4.3 Transmission Subsystem ...........................................................................................................................1 4.3.1 Introduction...........................................................................................................................................1 4.4 Functional Components.............................................................................................................................1 4.4.1 Symbol Concatenation ..........................................................................................................................1 4.4.2 Diversity Delay .....................................................................................................................................1 4.4.3 Low Pass Filtering.................................................................................................................................1 4.4.4 Analog AM Modulator..........................................................................................................................1 AM Transmission Specification © 2001 iBiquity Digital Corporation 11/08/01 Doc. No. SY_TN_5010 Rev. 01 4.4.5 Analog/Digital Combiner......................................................................................................................1 4.4.6 Up-Conversion ......................................................................................................................................1 4.5 GPS Synchronization.................................................................................................................................1 5 WAVEFORMS AND SPECTRA.......................................................................................................................1 5.1 Introduction ...............................................................................................................................................1 5.2 Spectral Conventions.................................................................................................................................1 5.3 Hybrid Spectrum .......................................................................................................................................1 5.4 All Digital Spectrum..................................................................................................................................1 6 SUPPLEMENT A AM TRANSMISSION SPECIFICATIONS ........................................................................1 6.1 Introduction ...............................................................................................................................................1 6.2 Service Mode Switching............................................................................................................................1 6.3 Synchronization Tolerances.......................................................................................................................1 6.3.1 Analog Diversity Delay.........................................................................................................................1 6.3.2 Time and Frequency Accuracy and Stability ........................................................................................1 6.3.3 L1 Frame Timing Phase ........................................................................................................................1 6.3.4 AM Spectral Emissions Limits..............................................................................................................1 6.3.5 Alternative Spectral Emissions Limit for Hybrid Mode........................................................................1 6.3.6 Alternative Spectral Emissions Limit for All Digital Mode..................................................................1 6.4 Digital Sideband Levels.............................................................................................................................1 6.5 Analog Audio Source ................................................................................................................................1 List of Figures Figure 3-1 AM Air Interface L1 Functional Block Diagram ..................................................................................1 Figure 4-1 OFDM Signal Generation Conceptual Block Diagram.........................................................................1 Figure 4-2 Pulse Shaping Function.........................................................................................................................1 Figure 4-3 Hybrid Transmission Subsystem Functional Block Diagram ...............................................................1 Figure 4-4 All Digital Transmission Subsystem Functional Block Diagram..........................................................1 Figure 5-1 AM IBOC Hybrid Waveform Spectrum ...............................................................................................1
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