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The optimal degree distribution algorithm of LT codes of digital fountain was proposed, and its drawbacks in realization were mentioned. On the basis of optimal degree distribution, a practical suboptimal degree distribution algorithm was put forward. Through simulation, with respect to the channel efficiency in satellite data broadcasting system, advanced LT codes based on suboptimal degree distribution algorithm performed better than classical LT codes based on robust soliton degree distribution algorithm, RSE codes and that without packet level FEC technology. The conclusion of research is practically valuable in improving the channel efficiency of satellite data broadcasting system.
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