METHOD AND DEVICE FOR TRANSMITTING AND RECEIVING SERVICE DESCRIPTION INFORMATION IN DIGITAL AUDIO BROADCASTING SYSTEM

摘要

Disclosed are a method and device for transmitting and receiving service description information in a digital audio broadcasting system. When transmitting, a code scrambling, forward error correction coding, bit interleaving, and constellation mapping are performed in sequence on the service description information to acquire a modulation symbol. The modulation symbol is placed in accordance to the distribution pattern thereof on a predetermined symbol and a carrier thereof in the residual capacity of a system on the basis of the structure of a system frame, and is multiplexed with other signal elements into a frequency-domain signal, then the frequency-domain signal is converted into a time-domain signal for transmission. When receiving, the time-domain signal is converted into the frequency-domain signal while an effective carrier is demultiplexed therefrom, then a service description information symbol distributed is extracted from the effective carrier on the basis of the structure of the system frame, and a demapping, deinterleaving, forward error correction decoding, and descrambling are performed in sequence to acquire the service description information. Employment of the present invention improves the credibility of transmitting the service description information symbol in the residual capacity, and provides the digital audio broadcasting system with an enhanced guarantee in supporting rich program contents and flexible service modes.