关键词: LDPC码, WED算法, 级联译码算法

Abstract:

Weighted Erasure Decoding（WED） algorithm is investigated in this paper，based on which，a new BP-WED concatenation algorithm for LDPC codes is proposed.Belief Propagation（BP） algorithm is a kind of soft-in-soft-out algorithm.When BP algorithm fails，the soft LLR reliable information is quantized and sent to the WED algorithm.WED algorithm is a very attractive solution for practical implementations of low-complexity reliability-based algorithms owing to its simplicity，therefore the BP-WED concatenation algorithm is more easy in hardware implementation compared to other concatenation algorithms，such as BP-OSD，BP-BMA，etc.The simulation results show that the proposed concatenation algorithm is effective，and can achieve a good tradeoff between computational complexity and decoding performance.

Key words: LDPC codes, Weighted Erasure Decoding（WED）, concatenation algorithm