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提出一种基于存储机制(memory-based, MB)的 Luby 变换(Luby transform, LT)码的编译码方法，来实现信息在二进制删除信道(binary erasure channel, BEC)中的可靠传输。首先，发送端的编码器采用泊松鲁棒孤子分布(Poisson-robust soliton distribution, PRSD)产生普通编码包，同时产生携带存储信息的“存储包”。然后，源源不断在 BEC 中发送编码包和“存储包”给接收端。接收端的译码器根据接收到的“存储包”的数量不同，采取不同方式对输入包进行译码。如果“存储包”全部被接收，则所有输入包都能通过“存储包”中的存储信息直接获得；如果部分“存储包”丢失，则结合“存储包”和置信传播(belief propagation, BP)算法进行译码；如果所有“存储包”丢失，则仅采用 BP 算法进行译码。仿真结果表明，相比 LT 码的传统编译码方法，采用 PRSD-MB 可以大大降低误比特率(bit error rate, BER)，提高编译码效率。
A coding-decoding method based on memory-based (MB) -based Luby transform (LT) codes is proposed to realize the reliable transmission of information in a binary erasure channel (BEC). First, the sender’s encoder uses a Poisson-robust soliton distribution (PRSD) to generate a normal encoded packet and a “storage packet” that carries the stored information. Then, a steady stream of encoded packets and “storage packets” are sent to the receiving end in the BEC. The decoder at the receiving end decodes the input packet in different ways according to the number of “storage packets” received. If all the “storage packages” are received, all the input packages can be directly obtained through the storage information in the “storage package”. If some “storage packages” are lost, the “storage package” and the belief propagation (BP) Algorithm; if all “storage packages” are lost, then only the BP algorithm is used for decoding. The simulation results show that PRSD-MB can greatly reduce the bit error rate (BER) and improve the coding and decoding efficiency compared with the traditional coding method of LT code.