Design And Implication Of CMMB Modulator

This paper mainly researches the CMMB modulation system. First of all, the paper details the basic principles and the key technologies of the CMMB modulation system on the basis of introducing the key technologies, development and application of both HDTV and mobile TV briefly. Secondly, in this paper, the main module in the CMMB modulation system is designed, Including the improved inverse Fast Fourier Transform, LDPC coding basing on parity matrix and RS coding. By designing the module above for reusing the different modes, the system can reduce the hardware resources, and according to the characteristics of the CMMB modulation system, the design of the module increases the speed of the modulator. Lastly, this paper gives a method to modulate fast and accurately by using the interweaver as the basic unit of modulation. By using all modes modulator circularly, the system accomplishs the process of modulation.In the end, the paper provides a model of the modulation system platform which can generate the data of modulator.