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.
International Journal of Information and Communication Technology, 2017 Vol.11 No.2, pp.275 - 285
Accepted: 23 Nov 2014
Published online: 11 Aug 2017 *