| LDPC-BICM图模型中新的非参数消息调度机制 |
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| 引用本文： | 段琳琳,王忠勇,高向川,肖岩. LDPC-BICM图模型中新的非参数消息调度机制[J]. 信号处理, 2014, 30(9): 1000-1006 |
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| 作者姓名： | 段琳琳 王忠勇 高向川 肖岩 |
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| 作者单位： | 郑州大学信息工程学院 |
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| 基金项目： | 国家自然科学基金(61172086,61201251);国家自然科学基金联合基金(U1204607);博士后科研启动基金(2011012) |
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| 摘 要： | 针对时变信道下LDPC编码的比特交织编码调制（Low Density Parity-Check coded Bit-Interleaved Coded Modulation, LDPC-BICM）系统的因子图模型中信道估计精度低与复杂度较高等问题，改进传统参数消息调度机制，提出一种新的非参数消息调度机制实现联合信道估计与译码。为获得性能与复杂度的折中，一方面从全局角度考虑，合理选择不同的内外迭代组合形式，设计了稀疏估计的消息调度机制，一方面从迭代译码角度考虑，通过选择不同的门限和比较准则，设计了局部选择性更新的消息调度机制。同时，将max-sum规则与MCMC粒子滤波相结合，给出基于硬判决的信道消息更新机制，有效解决了粒子样本枯竭问题，提高了信道估计精度。仿真结果表明，这种消息调度机制不仅有效降低复杂度，并且优于传统的消息调度机制。
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| 关 键 词： | LDPC编码的比特交织编码调制 因子图 最大和规则粒子滤波 消息调度机制 |
| 收稿时间： | 2014-02-26 |
A Novel Nonparametric Messages Update Schedule in Graphical Model of LDPC-BICM |
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| Affiliation: | College of Information Engineering,Zhengzhou UniversityCollege of Information system and Engineering, PLA Information and Engineering University |
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| Abstract: | Compared to conventional message schedule in factor graph model of LDPC-BICM (low density parity-check coded Bit-Interleaved Coded Modulation) system, a novel nonparametric message update schedule is proposed to get a good trade-off between the performance and complexity. From a global perspective, a message update schedule with sparse channel estimation is designed by selecting different kinds of combination of the outer and inner iteration. And a partial selective message update schedule is designed from the local iterative decoding perspective by choosing proper comparison rule and threshold. In addition, a channel message update schedule is presented to prevent particle impoverishment and improve channel estimation precision by combining Markov Chain Monte Carlo (MCMC) particle filters (PF) into max-sum rule. Simulation results illustrate effectiveness and performance superiority of the proposed schedule compared to conventional schedule. |
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