| 一种基于BP和WED的级联译码算法 |
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| 引用本文： | 乔国垒,皮德福.一种基于BP和WED的级联译码算法[J].计算机工程与应用,2010,46(10):109-110. |
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| 作者姓名： | 乔国垒 皮德福 |
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| 作者单位： | 1. 淮海工学院电子工程学院,江苏连云港,222005
2. 南京理工大学电子工程与光电技术学院,南京,210000 |
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| 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。
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| 关 键 词： | LDPC码 WED算法 级联译码算法 |
| 收稿时间： | 2009-9-24 |
| 修稿时间： | 2010-1-13
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Concatenation decoding algorithm based on BP and WED |
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| QIAO Guo-lei,PI De-fu.Concatenation decoding algorithm based on BP and WED[J].Computer Engineering and Applications,2010,46(10):109-110. |
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| Authors: | QIAO Guo-lei PI De-fu |
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| Affiliation: | 1.School of Electronic Engineering, Huaihai Institute of Technology,Lianyungang, Jiangsu 222005, China 2.School of Electronic Engineering and Optoelectronic Teehnique,Nanjing University of Science and Technology,Nanjing 210000,China) |
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| 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. |
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| Keywords: | LDPC codes Weighted Erasure Decoding(WED) concatenation algorithm |
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