Author(s)

Hui Song, Di’en Xiong

Corresponding Author

Di’en Xiong

Abstract

Deep-space optical communications have the characteristics of high code error rate, long delay and easily broken link etc. Channel coding, as a key technology, can solve the problems of the deep-space optical communication system. Compared with the traditional channel coding, LT code is more suitable for the system, in which the degree distribution design of LT code is also importance. In the paper, the double switch degree distribution scheme is proposed to improve degree distribution. Simulation results show that the bit-error rate (BER) performance of LT code with Robust Soliton Distribution (RSD) for the system is about 1.5 dB better than that of RS code for the system at BER of 10-6, and is also about 0.8 dB better than that of LDPC code for the system at BER of 10-6. LT code with RSD is about 0.45 dB worse than LT code with the double switch degree distribution at BER of 10-5.

Keywords

deep space optical communications, LT code, degree distribution, bit-error rate