Frame Structure And Recerver Design Of Digital Am Broadcasting

The structure of frame affects directly to the problem of synchronous, the channel estimating, and also the credibility and reliability of the signals. It is necessary to acquaint with the model and the theory of the OFDM system, the structure of the signals, the number of sub carries, the OFDM sign a form etc. In this paper, Digital Radio Mondial (DRM) system is investigated. The frame structure of Orthogonal Frequency Division (OFDM) in the DRM system is discussed. So it counts much to excerpt the way of combinition of time-frequency estimating, two-dimensional (2D) channel estimating and one-dimensional channel estimating which have been already studied and compare the calculation and the performance. We study the characteristics of the frame of the DRM system, and then reset the parameters of the channel of DAMB(Digital Amplitude Modulation Broadcast)in which the bandwidth is cut to half. We make a brief introduction to the frame structure of WLAN and DAB, then make more focus on the structure and the parameter setting of SDC, FAC, MSC of DABM system, with the diagram of the frame structure for DAMB system. We simplify the channel parameters of the Service Description Channel (SDC), in which 181 bits are cut down, so does the Fast Access Channel (FAC) in which 7 bits are cut down, so as to make the system more efficiency.Final, the hardware design of the single-channel narrowband of the digital receiver of DAMB is also introduced, in which the RF receiver counts much.