| CDMB is a candidate of mobile TV standard, and it is based on DAB + FIAVS + AVS. AVS is the second-generation digital audio and video source standards, which can be compared with MPEG-4 and H.264, with independent intellectual property rights. FIAVS(Fast Information Aided Video Streams) is based on the original transport protocol of DAB systems, to be the fast information channel for transmitting video streams, and it takes full accout of DAB's FIC, and does not ues any reservation bit, make full uses of FIB to configure video and audio streams dynamic and simply. FIAVS compares MPEG-2 TS with FIAVS, with the conclusion that the efficiency of FIAVS is 5% higher than the MPEG-2 TS.The main work includes:⑴Based on CDMB, with Link-Level Simulation, it pays attention to introduce DAB and the construction of FIAVS. The simulation of the blocks includes energy dispersal, convolution coding, time interleaving, frequent interleaving, shift-DQPSK modulation, differential modulation, OFDM system etc. The paper analogs the critical technology of CDMB, and introduce the related simulation algorithm and the theory of channel modeling.⑵The paper focus on the research of CDMB in four different mode, FIC and MSC are in static multipath fading and doppler multipath fading, AWGN channel are added to this model, we observe it in four different mode and get conclusions. We find a right place to add FIAVS in FIB, and add RS encode in the system.⑶The simulation software is programmed by C languague, the simulation data will be entered in the drawing MATLAB, facilitate the observation and theoretical analysis. According to compare with the data which producted by software, we can provide some useful data for system improve and implement.⑷In the end, the paper makes a conclusion of the whole work, and prospects the scheme and research of the simulating system of CDMB. |
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