A New Method to Design Modified Robust Distribution of LT Codes

Abstract

The performance of the decoding process of LT codes depends largely on its degree distribution. Due to the Significance of the degree distribution, the optimization of it is worth explored. In this paper, we propose a new method to design the degree distribution. We make modification to the robust soliton distribution through adding adjusted binary exponential distribution and modified Poisson distribution on RSD and controlling the weight of them. This method can combine the advantages of these degree distributions and highly improve the performance of encoding and decoding. Through simulation experiments, we have obtained the optimal value of weight and verified its better performance.