CAJ | 학술논문

LT码是喷泉码的一种，在删除信道中性能优越，分布式喷泉码多信源多中继的特性适合用于深空通信中。无标度网络(SF network)具有平均路径(APL)长最小的特性，非常适合喷泉码的度分布设计需求。首先介绍了LT码的编译码算法，然后对无标度网络和基于无标度网络的SF-LT码度分布设计进行了详细分析和优化，最后在删除信道条件下，选取码长较短、删除概率较小的情形对分布式二信源SF-LT码进行仿真分析，仿真结果表明，与LT码相比，分布式SF-LT码具有更好的性能。
LT마시분천마적일충，재산제신도중성능우월，분포식분천마다신원다중계적특성괄합용우심공통신중。무표도망락(SF network)구유평균로경(APL)장최소적특성，비상괄합분천마적도분포설계수구。수선개소료LT마적편역마산법，연후대무표도망락화기우무표도망락적SF-LT마도분포설계진행료상세분석화우화，최후재산제신도조건하，선취마장교단、산제개솔교소적정형대분포식이신원SF-LT마진행방진분석，방진결과표명，여LT마상비，분포식SF-LT마구유경호적성능。
LT code is one of the fountain codes which performs well in erasure channel. The characteristics of multi sources and multi relays make distributed fountain codes fit for deep space communications. Scale-free network has the characteristic of the minimum average path length which makes it perfect for the de-sign requirement of degree distribution in fountain codes. The encoding and decoding algorithm of LT codes is introduced in this paper first, then the design of degree distribution in scale-free networks and SF-LT codes based on the scale-free network is analyzed and optimized. At last, under the condition of erasure channel, the simulation of SF-LT codes with distributed binary sources under shorter code length and low-er erasure probability is done. The result shows that distributed SF-LT codes have better performance than LT codes.