Construction of LT codes with unequal erasure protection for rateless data transmission

Abstract

A new degree distribution, termed as the Flexible Soliton Degree Distribution(FSDD), is proposed to meet the performance need of LT codes with Unequal Erasure Protection(UEP). Owing to use the variable number of output symbols and the number of priority levels as parameters in FSDD, the encoder can flexibly generate the suitable degree distribution for LT codes with UEP. Furthermore, the improved encoding algorithm, called FSDD-LT, is proposed. The performance of the proposed encoding algorithm is compared with other conventional LT codes with UEP under the same parameters in Binary Erasure Channel(BEC).