LT码及其在智能配网通信中的应用研究

Research on LT codes and its application in intelligent distribution network

喷泉码是一种新型的信道编码技术,只需要很少的译码开销,具有很小的编译码复杂度,LT码作为喷泉码的常用码字具有重要研究意义.作者介绍了LT码的编、译码原理,在置信传播算法BP和高斯消元法GE的基础上得到2种改进的译码算法,并研究改进译码算法的性能.仿真分析电力通信配网中不同信道编码方式与LT码级联使用的通信可靠性,得出LDPC-LT编码方案具有较高的译码速率和较低的误比特率,从而为LT码在智能配网中的实际应用提供有益参考.

Fountain codes are novel channel coding technologies with very little decoding overhead and a small complexity of encoding and decoding. LT codes have an important research value, considering it is widely used in network and wireless communication as one class of fountain codes. The encoding and decoding algorithms of LT code are introduced in this paper. Two kinds of improved decoding algorithms, which base on Belief Propa- gation （BP） algorithm and Gaussian Elimination （GE） algorithm, are obtained. The performance of the two kinds of improved decoding algorithms is significant. The reliability of communication system which include LT code on- ly and combine LT code with other different kinds of channel coding, such as LT with CRC, LDPC code, are simu- lated. The encoding scheme of LT with LDPC, the result of which is obtained from simulation, has a high decoding rate and more lower bit error rate than the one of others, which provides a preferable reference for the practical application in intelligent distribution network.