GY/T 268.1-2013Digital audio broadcasting in FM band - Part 1: Framing structure, channel coding and modulation for digital broadcasting channel (English PDF)

Foreword

GY/T 268 "Digital audio broadcasting in FM band" is planned to publish the

following parts.

— Part 1.Framing structure, channel coding and modulation for digital

broadcasting channel;

— Part 2.Multiplexing;

This Part is the Part 1 of GY/T 268.

This Part was drafted according to the provisions specified in the GB/T 1.1-

2009.

This Part shall be under the jurisdiction of the National Technical Committee for

Standardization of Radio, Film and Television (SAC/TC 239).

Drafting organizations of this Part. Academy of Broadcasting Science,

SAPPRFT; and (Beijing) TiMi-Terrestrial Interactive Multimedia Infrastructure.

Main drafters of this Part. Zou Feng, Li Jinwen, Shen Hongbing, Gao Peng, Lei

Wen, Yang Ming, Xing Guanbin, Li Jilong, Tao Tao, Sheng Guofang, Li Qun,

Wu Zhiyong, Bai Dong, and Di Na.

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1 Scope

This Part specifies the signal framing structure and technology of channel

coding and modulation for the broadcasting channel of the digital audio

broadcasting system, within the frequency range of 87MHz to 108MHz.

2 Normative references

The following documents are essential to the application of this Part. For dated

references, only the versions with the dates indicated are applicable to this Part.

For undated references, only the latest versions (including all the amendments)

are applicable to this Part.

GB/T 4311-2000 Technical specifications for FM sound broadcasting at VHF

3 Terms, definitions, symbols, protocol and abbreviations

The super frames are composed of 4 continuous physical-layer frames.

The pilots refer to partial sub-carriers used for transmitting the signals for

auxiliary terminal demodulation in a specific position among OFDM symbols,

which is divided into continual pilot and scattered pilot.

4 System description

SEE Figure 2 for the functional block diagram for the physical coding and

modulation of digital audio broadcasting channel in FM band.

Each 640ms of physical frame is considered as one frame, which is used for

carrying the data obtained from multiplexing frames.

5 Subsystem description

The system information is transmitted in unit of a logic sub-frame.

SEE Figure 20 for the beacon structure, including the cyclic prefix with the

length of TBcp and the same two synchronization signals Sb(t). Sb(t) represents

the pseudo-random signals with limited frequency band.

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