Methods and devices for sending and receiving digital audio signal in digital audio broadcasting system

Abstract

The invention provides methods for sending and receiving a digital audio signal in a digital audio broadcasting system. Service data are scrambled and subjected to low density parity check (LDPC) coding, constellation mapping and sub-carrier interleaving at a sending end; service description information is scrambled and subjected to convolutional coding, bit interleaving and constellation mapping; system information is subjected to convolutional coding, bit interleaving and constellation mapping; the information and discrete pilots are multiplexed together and mapped to a corresponding spectrum mode to form an orthogonal frequency division multiplexing (OFDM) frequency domain symbol; and conversion of a frequency domain and a time domain is performed, a logic layer frame structure is formed by connection, and a physical layer frame structure is mapped from the logic layer frame structure and framed for transmission. The invention has the advantages that according to the spectrum characteristics of the conventional frequency modulation (FM) frequency range, a flexible spectrum mode is designed, and the conventional analog FM broadcasting signal is not influenced. The invention is expandable in spectrum, flexible in system transmission parameter setting and applicable to single-frequency network and multi-frequency network modes.

Description

Technical field [0001] The present invention involves the field of digital information transmission technology, especially the digital audio signal sending and receiving methods and devices in a digital audio broadcast system. Background technique [0002] The traditional FM frequency band (87MHz-108MHz) is a frequency-regulating broadcast frequency band. Its bandwidth is 100kHz or 200kHz. It can only provide users with the most basic broadcasting business. At present, China still adopts traditional simulation frequency radio broadcasts.The use of digital audio broadcasting provides digital audio and data services, which is radio. A little pair of multiple, a little opposite, the cost of broadcast information has nothing to do with the number of users and good sound quality, high receiving quality, strong anti -interference, small transmitting power, coverage of coverage, coveragelarge area.Regardless of audio quality, spectrum efficiency, or support for new business, compared wi...

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Problems solved by technology

However, the DRM system is a narrow-band system like the traditional analog audio broadcasting. For frequency selective fading caused by radio wave multipath propagation, frequency diversi

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