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Taking the physical level code in the DVB-S protocol standard as the research object, a communication model consisting of RS codes, convolutional codes and convolutional interleaver is established, we analyze the architecture of concatenated codes, and find the weakness of the DVB-S protocol standard of concatenated codes exist in the encoding system, design an error pattern based on interleaving, gives the design ideas and specific design methods, the simulation effect of the error pattern with different number of error bits in error symbols of the concatenated codes the decoding performance, and compared with the burst error pattern. The simulation results show that the interlaced error pattern has a greater impact on the decoding performance of the concatenated code than the burst error.