GY/T 268.1-2013 PDF English
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Digital audio broadcasting in FM band - Part 1: Framing structure, channel coding and modulation for digital broadcasting channel
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GY/T 268.1-2013: PDF in English (GYT 268.1-2013) GY/T 268.1-2013
Page 1
GY
Radio, Film and Television Industry Standard
of the People’s Republic of China
Digital audio broadcasting in FM band – Part 1.
Framing structure, channel coding and
modulation for digital broadcasting channel
ISSUED ON. AUGUST 14, 2013
IMPLEMENTED ON. AUGUST 14, 2013
Issued by. State Administration of Press, Publication, Radio, Film and
Television of the People’s Republic of China
Page 2
Table of Contents
Foreword ... 7
Introduction ... 8
1 Scope ... 9
2 Normative references ... 9
3 Terms, definitions, symbols, protocol and abbreviations ... 9
3.1 Terms and definitions ... 9
3.2 Symbols ... 13
3.3 Protocol ... 14
3.4 Abbreviations ... 14
3.5 Operational symbols... 14
4 System description ... 15
4.1 Summary ... 15
4.2 Structure of physical layers ... 17
4.3 Framing structure ... 18
4.4 System transmission mode ... 19
4.5 Spectrum mode ... 20
4.6 System information... 22
4.7 Physical layer input and output ... 25
5 Subsystem description ... 25
5.1 Scramble code ... 25
5.2 Forward error correction coding ... 25
5.3 Bit interleaving ... 28
5.4 Constellation labeling ... 29
5.5 Valid sub-carriers of OFDM symbols ... 37
5.6 Sub-carrier matrix ... 38
5.7 Interleaving of the data elements containing MSDS ... 42
5.8 OFDM modulation ... 43
Page 3
5.9 Framing of logic frames ... 44
5.10 Sub-frame allocation mode ... 47
5.11 Physical frame ... 49
5.12 Modulated RF signals ... 49
Appendix A ... 55
Appendix B ... 56
Appendix C ... 58
Appendix D ... 62
Figure 1 Structure Diagram for Digital Audio Broadcasting System in FM
Band ... 16
Figure 2 Functional Block Diagram of Physical Layers ... 18
Figure 3 Structure of Logic Frames and Physical Frames ... 19
Figure 4 Sub-frame Structure Diagram ... 19
Figure 5 Block Diagram for CRC Shift Registers ... 24
Figure 6 Linear Feedback Shift Register for Scramble Code Generation
... 25
Figure 7 Convolutional Coder ... 27
Figure 8 QPSK Constellation Labeling ... 29
Figure 9 16QAM Constellation Labeling ... 30
Figure 10 64QAM Constellation Labeling ... 31
Figure 11 16QAM Constellation Labeling, hierarchical modulation α = 1
... 32
Figure 12 16QAM Constellation Labeling, hierarchical modulation α = 2
... 32
Figure 13 16QAM Constellation Labeling, hierarchical modulation α = 4
Page 4
... 33
Figure 14 64QAM Constellation Labeling, hierarchical modulation α = 1
... 34
Figure 15 64QAM Constellation Labeling, hierarchical modulation α = 2
... 35
Figure 16 64QAM Constellation Labeling, hierarchical modulation α = 4
... 36
Figure 17 Coding and Modulation of Hierarchical Modulation ... 37
Figure 18 Pseudo-random Sequence Generator of Scattered pilots ... 38
Figure 19 Filling Mode of the Sub-matrix for Sub-carriers ... 41
Figure 20 Beacon Structure... 45
Figure 21 OFDM Symbols ... 46
Figure 22 GI Overlapping ... 46
Figure 23 GI Signal Selection ... 47
Figure 24 Sub-frame Allocation Mode 1 ... 48
Figure 25 Sub-frame Allocation Mode 2 ... 48
Figure 26 Sub-frame Allocation Mode 3 ... 49
Figure 27 Spectrum Mask for Spectrum Mode Index 1 ... 50
Figure 28 Spectrum Mask for Spectrum Mode Index 2 ... 50
Figure 29 Spectrum Mask for Spectrum Mode Index 9 ... 51
Figure 30 Spectrum Mask for Spectrum Mode Index 10 ... 51
Figure 31 Spectrum Mask for Spectrum Mode Index 22 ... 52
Figure 32 Spectrum Mask for Spectrum Mode Index 23 ... 52
Figure B.1 Spectrum Sketch Map of Spectrum Mode 9 ... 56
Page 5
Figure B.2 Spectrum Sketch Map of Spectrum Mode 10 ... 57
Figure C.1 Sketch Map for the Sub-carrier Index of OFDM Symbols in the
Transmission Modes 1 and 3 ... 58
Figure C.2 Sketch Map for the Sub-carrier Index of OFDM Symbols in the
Transmission Mode 2 ... 59
Table 1 Transmission Parameters of Three Kinds of Transmission
Modes ... 20
Table 2 Spectrum Mode ... 21
Table 3 Correspondence between Sub-band Identified frequency and
Described Bit ... 22
Table 4 Correspondence between Bit Definition and Spectrum Mode
Index ... 22
Table 5 Category Division of Spectrum Mode Index ... 22
Table 6 Bit Description of System Information ... 22
Table 7 LDPC Coding Configuration ... 27
Table 8 Values of l ... 28
Table 9 System Information Positions Located in the Columns of Each
Row of Ms,t ...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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