Research On TDS-OFDM In DMB-T System

Digital television terrestrial broadcasting (DTTB) is one of the three methods used for digital TV transmission. It's the hot spots in recent research. In this paper it first introduces three DTTB transmission standards admitted by ITU. They are ATSC 8-VSB proposed by America,DVB-T proposed by Europe and ISDB-T proposed by Japan. Then it describes DMB-T system in details, which is developed by Tsinghua University in China. It introduces the key techniques used in the system,the frame structure,the parameters of OFDM signal frame and so on. The paper provides the comparison among DMB-T system and other three international standards.Besides, it provides a brief introduction about the current standards(DVB-H from Europe,DMB from Korea,MediaFLO from Qualcomm Inc. and ISDB-T from Japan) for Mobile Digital TV. It also gives a general description of DMB-H, which is developed based on DMB-T system.This paper focuses on the study of the core part in DMB-T system—Time Domain Synchronous Orthogonal Frequency Division Multiplexing (TDS-OFDM).The contents that we study and successfully achieve in this paper are listed as follow:1,Research on the components of TDS-OFDM signal frame;2,Principle and realization of PN sequence which belongs to the frame header;3,Algorithm design and simulation realization of 3780 points IFFT which belongs to the frame body;4,Improvement of 3780 points IFFT algorithm;5,To produce a complete signal frame;6,Principle and simulation realization of time synchronization in TDS-OFDM system.