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题名: 一种交叠的Shuffled-BP LDPC译码算法
其他题名: An overlapped Shuffled-BP LDPC decoding algorithm
作者: 王丽冲; 姚秀娟; 孟新
作者部门: 空间技术部
通讯作者: 范亚楠 (fanyanan_99@163.com)
关键词: LDPC码 ; 收敛速度 ; 译码算法 ; Shuffled-BP ; 交叠的Shuffled-BP
刊名: 电子与信息学报
ISSN号: 1009-5896
出版日期: 2016
卷号: 38, 期号:11, 页码:2908-2915
收录类别: EI
中文摘要: Shuffled-BP(SBP)译码算法是一种基于变量节点的串行消息传递译码算法,其收敛速度快于原有的置信度传播译码算法,然而由于实际工程实现中的半并行化处理,其收敛速度和误码性能均有所降低。为了进一步提高SBP算法的性能,该文提出一种交叠的Shuffled-BP(Overlapped Shuffled-BP, OSBP)译码算法。该算法采用若干个相同的子译码器以不同的更新顺序同时进行更新,对于每个变量节点,在每次迭代更新后选取最可靠的信息参与下一次迭代,以此提高迭代的收敛速度。理论分析和仿真实验均表明,在不增加额外存储空间的条件下,OSBP算法相比于SBP算法有着更优的误码性能以及更快的收敛速度。此外,提出的OSBP算法对于规则和不规则LDPC码均有效。
英文摘要: Shuffled-BP (SBP) decoding algorithm is a variable-node-based serial decoding algorithm, which converges faster than the original Belief-Propagation (BP) decoding algorithm. However, due to the semi-parallel processing, there is a decrease in terms of convergence speed and error performance. An Overlapped Shuffled-BP(OSBP) decoding algorithm is proposed to enhance further the performance of the Shuffled-BP algorithm. In this algorithm, more than one sub-decoders are used to execute simultaneously, every sub-decoder has different updating order from each other. Regarding each variable node, the most reliable messages are kept and used for the next iteration, thus a faster convergence can be provided. Both theoretical analysis and simulation results show that, compared with SBP algorithm, OSBP algorithm possesses a better error performance as well as a higher convergence speed and introduces no extra storage requirement. Moreover, the proposed algorithm is effective for both regular and irregular LDPC codes. © 2016, Science Press. All right reserved.
语种: 中文
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/5647
Appears in Collections:空间技术部_期刊论文

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