Design And Realization Of Synchronization Techniques In DVB-T System Based On OFDM

Digital Video Broadcasting-Terrestrial(DVB-T)has been one of the accepted standards for terrestrial transmission and has been the most popular standards in the world. It adopts Coded Orthogonal Frequency Division Multiplexing(COFDM) as the modulation technique, not only have the superior frequency efficiency, but also have a good capability in confronting the multipath fading and impulse noise.These make it will be good at transmitting through the wireless channel.This dissertation focuses on the synchronization design and implementation for DVB-T. The main contribution of this dissertation can be concluded as following:Firstly, this dissertation gives a brief introduction about the characteristics of the terrestrial wireless channel and the basic principles of OFDM technology, summarized the existing synchronization technology,highlighting two algorithms: the maximum likelihood algorithm based on the cyclic prefix and the synchronization algorithm based on the training sequence, followed by the computer simulation and the performance analysis.Secondly, from the beginning of DVB-T standard, combined with the frame structure of the transmission system characteristics of the transmission system model, on this basis, simulates and analyses the algorithms and realization with MATLAB.Finally, the process and the achievement structure of the receiving system synchronization are presented, determined the realization structure of each module, focusing on rough symbol synchronization process module as well as CORDIC angle calculation algorithm process which is in the fraction carrier frequency offset estimation module, at last, wirtes the verilog code and completed the module simulation under the Quartus.