删除信道下单反馈SLT编码

基于反馈信息的喷泉码在选择合适的度分布函数下可以有效降低译码开销.将DALT码与基于反馈信息的SRSD度分布函数相结合,提出一种适用在删除概率较低信道中使用的单反馈SLT编码方法.与传统LT码相比,该方法仅增加一次反馈,降低了编译码过程的复杂度,其编译码复杂度、开销等均与信道删除概率有关.理论分析及实验结果表明,在低删除概率信道中,采用所提方法可以有效地减少传输中编码包的个数,其喷泉码性能优于传统的LT码和SLT码.

SLT codes with single feedback in erasure channel

Fountain codes with feedback information can reduce the decoding overhead effectively if it chooses an appropriate degree distribution function. Combining DALT codes with SRSD based on feedback information, a coding method called single feedback shifted LT (SFSLT) codes for channels of low erasure probability is proposed. Compared with the traditional LT codes, the proposed method only increases one feedback process with much low complexity in encoding and decoding process. The complexity and overhead of encoding and decoding are related to the erasure probability of channel. The theoretical analyses and experimental results indicate that the proposed method reduces the number of encoded packets effectively if the erasure probability of channel is low enough, and the performance of fountain codes is superior to that of traditional LT codes and SLT codes.