【摘要】 在研究WED(Weighted Erasure Decoding)算法的基础上,提出了一种新的针对中短LDPC码的BP-WED级联译码算法。BP算法是软输入软输出的算法,当BP译码失败后,其输出软信息进行分级量化,送入WED算法。由于WED算法时间复杂度低,适于硬件实现,因此BP-WED级联译码算法要比BP-OSD等级联译码算法更具有硬件可实现性。仿真显示提出的BP-WED算法是有效的,可以在计算复杂度和性能之间进行较好的折衷。更多还原

【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.更多还原