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LT码(Luby Transform Codes)属于喷泉码的其中一种,它是一类基于图的线性纠删码,其应用的信道环境是删除信道(BEC,Binary Erasure Channel)。这里主要介绍在二元删除信道模型下,LT码的4种度分布设计方法及,分析了短码长和长码长情况下的LT码在不同信道删除概率情况下的性能及比较。研究结果表明:在删除概率非常大的情况下,只要译码端接收到足够多的包都能以高概率译出原始数据包,只是产生的冗余度大,这里的结果将为系统选择不同参数的LT码提供参考。
LT code belongs to one of the fountain codes. It is a class of graph-based linear erasure codes. The applied channel environment is Binary Erasure Channel (BEC). This article mainly introduces the four kinds of degree distribution design methods of LT codes under the binary deletion channel model and analyzes the performance and comparison of the LT codes under different channel deletion probabilities under the condition of short code length and long code length. The results show that when the probability of deletion is very large, as long as the decoding end receives enough packets to translate the original data packet with high probability, the redundancy generated is large, and the result will be different for system selection The LT code of the parameter provides a reference.