METHOD AND DEVICE FOR TRANSMITTING AND RECEIVING DIGITAL AUDIO SIGNAL IN DIGITAL AUDIO BROADCASTING SYSTEM

摘要

Provided in the present invention are a method and device for transmitting and receiving a digital audio signal in a digital audio broadcasting system. At a transmitting end, a code scrambling, LDPC coding, constellation mapping, and subcarrier interleaving are performed on service data, a code scrambling, convolution coding, bit interleaving, and constellation mapping are performed on service description information, while a convolution coding, bit interleaving, and constellation mapping are performed on system information, the information is multiplexed with a discrete pilot frequency and mapped onto a corresponding spectral pattern, thus constituting an OFDM frequency-domain symbol. A conversion from frequency-domain to time-domain is performed, connected into a logic layer frame structure, then a mapping and framing from the logic layer frame structure to a physical layer frame structure are performed for emission. The present invention designs a flexible spectral pattern on the basis of spectral characteristics of existing FM frequency bands, does not affect existing analog frequency modulation broadcast signals, and at the same time provides spectral expandability. A flexible system transmission parameter configuration is also provided, applicable in modes of single-frequency network and multi-frequency network.