The Design And Simulation Of DVB-T Inner Receiver Systems

In recent years, the development of DTV industry has been greatly promoted by the progress in the digital domain as well as people's endless pursue for high image quality and audio-visual enjoyment. Based on different media, digital TV can be divided into cable, satellite and terrestrial digital TV, and the terrestrial digital TV broadcasting is the most widely used means of the transmission. There are four kinds of existing international terrestrial digital TV transmission standard, among them, the DVB-T (Digital Video Broadcasting Terrestrial) system is the top rated and most widely applicable standards.This paper is to design the DVB-T inner receiver system. Based on DVB-T standard, system simulation and anaysis have been done, and a complete inner receiver design is proposed.(1) Paper first describes the basic theory of terrestrial digital TV foundation, then gives a test DVB-T channel model of the system as introducing the fundamental characteristics of wireless channel; finally analyzes the COFDM modulation.(2) The paper systematically researches the DVB-T standard. according to the source transform, we built and simulate the ideal signal source model of DVB-T system. By observing the changes of the data, we can understand the standard more clearly and thoroughly. And the whole scheme of the actual signal source is given.(3) Due to the DVB-T system's sensitivity for timing error and carrier offset, this paper focuses on the synchronization mechanism of the system and channel estimation, channel equalization. Through the simulation, we proposed feasible analysis about the algorithm.(4)Because of the high standars of DVB-T system for coherent demodulation and recovery of the channel characteristics, this paper focuses on the channel estimation and channel equalization. In the end, the feasibility of the overall system design is verified by judging the parameters: EVM and MER.