On the performance of LT codes

Abstract

Luby Transform codes are the first practical implementation of the digital fountain code. Their performance mainly depends on the degree distribution in erasure channels, but also on the low-degree variable nodes, whose reliability is pretty low, and thus results in the error floor. In this paper, we propose a scheme by applying the modified encoding to the Poisson Robust Soliton Distribution (PRSD) to further increase the overall the bit error rate (BER) performance over the additive white Gaussian noise (AWGN) channel. Simulation results demonstrate that the proposed scheme outperforms the existing schemes.