分组级短码长LT喷泉码的工程应用

Practical Research on Short Block Length Packet-Level LT Codes

摘要:

针对 LT喷泉码在准单向链路、高差错、链路恶劣易中断的信道环境应用时出现的运算量大、译码时延长、编码效率较低等问题,文章提出使用基于数据分块的分组级短码长喷泉码方案。其思想是将短码长 LT码方案和分组级 LT码方案结合起来,并且在数据子块的度序列生成过程中加入度值检测机制。实验仿真结果表明:与已提出的 LT码方案相比,该方案能够有效地降低译码开销、计算代价和译码时延,提高系统的最大传输效率。

Abstract:

In quasi unidirectional links, poor channel environment and high error rate situations, LT fountain codes oftencause a large amount of computing, extended decoding time, low coding efficiency and other problems. In this paper, thesmall code length packet-level coding scheme was proposed, which combined the short block length coding and packet-level LT codes, and applying degree detection mechanism in the process of sequence data generated in the sub-blocks.The simulation results showed that compared with the conventional LT codes, the proposed scheme could effectively re.duce the cost of decoding, computing costs and decoding delay and increase the maximum transmission efficiency of thesystem.