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LT码是喷泉码的一种,它是线型无速率码,在删除信道中性能优越。数据传输中有一些数据相对来说可能更重要,在这样的传输模型中,对于关键信息的保护显的尤为重要。基于此目的提出了一种分布式LT码多信源节点信息的保护措施,分级保护LT码是通过改进每个节点的度为1和2的数据包的原始数据包的选择以提高整个码字的性能,在此基础上引入分布式模型,使得得到的分布式分级保护码字结合了分布式LT码和分级保护LT码的双重优点。
LT code is a kind of fountain code, it is a linear rate-free code, excellent performance in the deletion of the channel. Some data in the data transmission may be more important than others, and in such a transmission model, it is especially important to protect the critical information. For this purpose, a distributed LT code multi-source node information protection measures are proposed. The hierarchical protection of LT codes is achieved by improving the selection of the original data packets of data packets of degrees 1 and 2 at each node to improve the whole code word Based on this, a distributed model is introduced to make the distributed hierarchical protection codeword combine the dual advantages of distributed LT code and hierarchical protection LT code.