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论文:2020,Vol:38,Issue(3):627-633 |
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引用本文： |
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刘亚琛, 汪鹏程, 田德红, 孙海信, 齐洁, 宋睿平. LT码的度分布优化研究[J]. 西北工业大学学报 |
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LIU Yachen, WANG Pengcheng, TIAN Dehong, SUN Haixin, QI Jie, SONG Ruiping. Research on Degree Distribution Optimization of LT Codes[J]. Northwestern polytechnical university |
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| LT码的度分布优化研究 |
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| 刘亚琛1,2, 汪鹏程2, 田德红3, 孙海信1, 齐洁2, 宋睿平1 |
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1. 厦门大学 信息学院, 福建 厦门 361005;
2. 厦门大学 电子科学与技术学院, 福建 厦门 361005;
3. 东南大学 经济管理学院, 江苏 南京 211189 |
| 摘要: |
| LT码作为一种对信道具有良好适应性的信道编码方案，已在水声通信中实现了稳定的数据传输。在译码开销较大的情况下，LT码可以达到理想误码率，但当编码数据长度较短时，其编译码性能并不理想。为改善LT码在编码数据长度较短时的性能，基于水声OFDM通信系统进行LT码的研究，以最低误码率和最小平均度值为优化目标，提出了一种度分布优化设计方法。仿真和海试试验结果表明：在相同的误码率下，该方法能优化系统，减小7%~22%不等的译码开销，降低编译码的复杂度。 |
| 关键词:
LT码
正交频分复用
水声通信
度分布
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| Research on Degree Distribution Optimization of LT Codes |
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| LIU Yachen1,2, WANG Pengcheng2, TIAN Dehong3, SUN Haixin1, QI Jie2, SONG Ruiping1 |
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1. School of Informatics, Xiamen University, Xiamen 361005, China;
2. School of Electronic Science and Engineering, Xiamen University, Xiamen 361005, China;
3. Southeast University, School of Economics and Management, Nanjing 211189, China |
| Abstract: |
| LT code, as a channel coding scheme with good adaptability to the channel, has a stable performance in data transmission of underwater acoustic communication. In the case of large decoding overhead, the LT code can reach the ideal bit error rate(BER), but when the length of the encoded data is short, its coding and decoding performance is not ideal. LT code was applied to underwater acoustic communication by combining with orthogonal frequency division multiplexing (OFDM), and a LT-OFDM system was constructed. To improve the performance of LT code in the case of short code length, a method for degree distribution optimization was proposed on the objective of minimizing BER and minimizing average coding degree. Simulation and sea trial results show that under the same BER this method can optimize the system, transform 7%-22% conversion, and reduce the complexity of coding and decoding. |
| Key words:
LT code
orthogonal frequency division multiplexing(OFDM)
underwater acoustic communication
degree distribution
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| 收稿日期: 2019-01-05
修回日期:
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| DOI: 10.1051/jnwpu/20203830627 |
| 基金项目: 国家自然科学基金（61671394）资助 |
| 通讯作者: 齐洁(1974-),女,厦门大学助理教授,主要从事水声通信及水下微弱信号检测研究。E-mail:qijie@xmu.edu.cn
Email：qijie@xmu.edu.cn |
| 作者简介: 刘亚琛(1996-),厦门大学博士研究生,主要从事水声通信及大数据技术研究。
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