Research Of Synchronization Techniques In DVB-H System

This paper presents the theory of the Orthogonal Frequency Division Multiplexing (OFDM) technique and the development history of DTV and focus on Mobile TV especially. Basic characters of wireless channel, transmission principles and signal frame structure design of DVB-T/H are introduced. Main non synchronization factors between OFDM transceivers are pointed out. Based on the coherent reception theory of radio signals and the theory of digital signal processing, the effects of carrier frequency offset, sampling clock offset, and symbol timing offset on OFDM signals are exploited. A series of amendments and new algorithms is derived from the in being algorithms of Guard Interval based symbol timing and frequency offset estimation, frequency-domain frequency offset, sampling offset, and symbol timing offset estimation. Finally, according to the DVB-H standard and the existing arithmetic, this paper outlines a complete OFDM fast synchronization scheme suitable for Mobile TV, followed by the computer simulation and the performance analysis.