Integrating non-repetitive Lt encoders with modified distribution to achieve unequal erasure protection

Kuo Kuang Yen, Yen Chin Liao, Chih-Lung Chen, John K. Zao, Hsie-Chia Chang

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


The performance of LT code is highly related to the code length. A decoder is more likely to deplete degree-1 encoding symbols and terminate during early stage when the code length is short. In this work, we modify the robust Soliton distribution (RSD) and increase the degree-1 proportion. More degree-1 encoding symbols can be generated to relieve early decoding termination. The proportion of low degrees, except for degree-1, is also reduced. Therefore, receivers collect less encoding symbols carrying redundant information. In addition, Non-Repetitive (NR) encoding scheme is proposed to avoid producing repeated degree-1 encoding symbols. To improve video transmission quality, previous studies redesign LT codes to provide Unequal Error Protection (UEP) for different Scalable Video Coding (SVC) layers. Unlike those studies to modify the code structure, we integrate multiple NR encoders to achieve UEP ability. Experimental results show that our UEP scheme outperforms previous studies in terms of the PSNR.

Original languageEnglish
Article number6544282
Pages (from-to)2162-2175
Number of pages14
JournalIEEE Transactions on Multimedia
Issue number8
StatePublished - Dec 2013


  • BP decoding
  • Degree
  • LT code
  • Non-repetitive encoding


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