Simulation And Implementation Of SRRC Filter And FFT Processor In Digital Terrestrial Television Broadcasting (DTTB) Transmission System

With the growing needs of people for digital television and digital video information, digital television broadcasting is developing rapidly in China. In recent years, the digital television transmission system technology matures gradually and Digital Terrestrial Television Broadcasting (DTTB) transmission standards formally tabled on August 30,2006 too. This is the standard technology made by several units from their joint research, with independent intellectual property rights. The study and simulation for DTTB systems are of tremendous practical value and broad market prospects.Firstly, in order to reduce the consumption of resources by the FIR filter, it takes the SRRC filters in DTTB system as an example, this paper introduces the method of pipelining transpose for implementing the FIR filter as well as the CSD and optimal RAG representations of coefficients. Practice indicates that this method economizes resources.Secondly, this paper focuses on the study of the core part in DTTB system - Orthogonal Frequency Division Multiplexing(OFDM), and researched on the components of TDS-OFDM signal frame.Finally, the design and implementation of a 3780-point FFT processor for DMB-T is researched. To get the optional time synchronization of OFDM, the sample rate of OFDM should be the same as the sample rate of time domain pilot. We studied many fast algorithm of FFT and presented a 3780-point IFFT data stream pipeline algorithm. Then this paper designed a fixed-point scaling method to efficiently utilize the output dynamic range of each stage, which simplify the implementation greatly. We optimized its internal word length.