Abstract: A new channel coding and modulation scheme adopted in Digital Television Terrestrial Broadcasting (DTTB) is presented, in which multilevel Block Product Code (BPC) is for the first time introduced to replace the serially concatenated codingarchitectures to improve spectrum efficiency and a multi-resolution 64QAM constellation is used for hierarchical modulation to offer three tiers of services within one DTTB channel. In the receiver, an iterative turbo decoding algorithm based on MAX-LOG-MAP criterion is adopted to achieve robust reception. Simulation shows that the bit SNR of High Priority stream is about 7 dB at the Thresholdof Visibility, which is competent for services requiring high reliability. TheMedium and Low Priority streams can support fixed outdoor reception.

Key words: DTTB, DMB-T, BPC(block product code), hierarchical modulation