Title: New degree distribution design scheme for LT codes

Authors: Meng Zhang; Weijia Lei

Addresses: Rongzhi College of Chongqing Technology, Business University, Chongqing, 400033, China ' Chongqing Key Lab of Mobile Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Abstract: The decoding efficiency deteriorates badly when the existing degree distributions are used to encode the source packets with small size. In this paper, we present a new way to design a degree distribution for LT codes. First, we combine two degree distributions with certain proportion and further adjust the degree by optimising the ripple size, so as to get a new degree distribution which can perform well when the message size is small. Through Monte-Carlo simulation experiments, we have verified that the degree distribution generated by our scheme can highly improve the performances of encoding and decoding, which remain fair even when the source data size gets small.

Keywords: LT codes; degree distribution; ripple size.

DOI: 10.1504/IJICT.2017.086253

International Journal of Information and Communication Technology, 2017 Vol.11 No.2, pp.275 - 285

Accepted: 23 Nov 2014
Published online: 11 Aug 2017 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article