Development of Advanced Terrestrial DMB System

摘要

This paper introduces an Advanced Terrestrial DMB (AT-DMB) system which is being developed in Korea. The aim of AT-DMB development is to provide better resolution video service on large size displays (over 24 inches) or additional data broadcasting services with increased data. In order to achieve higher data rates while maintaining backward compatibility to conventional T-DMB receivers, a hierarchical modulation method is applied. For the hierarchical modulation method, DQPSK/QPSK and DQPSK/BPSK methods are chosen for the AT-DMB standard. Coherent detection based on Decision Directed (DD) channel estimation and scalable video coding extensions of MPEG 4 AVC are also adopted. An AT-DMB system can deliver 2 Mbps of effective data, which is enough for Standard Definition (SD) picture quality. The performance of an AT-DMB system is verified through computer simulation and small scale field experimental broadcasting. With this successful result, AT-DMB is legislated as new T-DMB standards (TTAS. KO.07-0070) June of this year.