| 多载波码分多址在低密度二分图上的建模与分析 |
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| 引用本文： | 文磊,雷菁,魏急波,王建新.多载波码分多址在低密度二分图上的建模与分析[J].国防科技大学学报,2016,38(3):148-153. |
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| 作者姓名： | 文磊 雷菁 魏急波 王建新 |
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| 作者单位： | 国防科技大学电子科学与工程学院,国防科技大学电子科学与工程学院,国防科技大学电子科学与工程学院,国防科技大学电子科学与工程学院 |
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| 基金项目： | 国家自然科学基金资助项目(61372098),多用户安全通信系统的图模型编码研究；湖南省自然科学基金资助项目(S2012J5042),稀疏图码在多媒体通信中的应用研究。 |
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| 摘 要： | 多载波码分多址是移动通信重要的多址技术之一,传统方法将扩频序列的构造和多用户检测单独考虑,未能做到发射机和接收机的一体化设计。受到低密度奇偶校验码的启发,基于图论建立多载波码分多址收发机模型,采用二分图定义码片和数据符号间的扩频关系。在此基础上,利用适合低密度二分图的消息传递算法完成多用户迭代检测,推导并分析洪水消息传递和串行消息传递两种检测机制。仿真结果表明,当传统的多载波码分多址系统陷入严重过载而不能正常通信的情况下,基于低密度二分图的多载波码分多址系统依然能够达到理想的传输性能,为下一代移动通信系统的设计提供了有益的参考。
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| 关 键 词： | 二分图，多载波码分多址，迭代检测，消息传递机制 |
| 收稿时间： | 4/1/2015 12:00:00 AM |
Modeling and analysis of MC-CDMA system upon Tanner graph |
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| WEN Lei,LEI Jing,WEI Jibo and WANG Jianxin.Modeling and analysis of MC-CDMA system upon Tanner graph[J].Journal of National University of Defense Technology,2016,38(3):148-153. |
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| Authors: | WEN Lei LEI Jing WEI Jibo and WANG Jianxin |
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| Affiliation: | College of Electronic Science & Engineering, National University of Defence Technology, Changsha 410073, China,College of Electronic Science & Engineering, National University of Defence Technology, Changsha 410073, China,College of Electronic Science & Engineering, National University of Defence Technology, Changsha 410073, China and College of Electronic Science & Engineering, National University of Defence Technology, Changsha 410073, China |
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| Abstract: | MC-CDMA is an important multiple access technique for mobile communications. In conventional MC-CDMA, construction of spreading sequences and multiuser detection are considered separately, which means that the transmitter and the receiver are not designed jointly. Inspired by low density parity check matrix of LDPC codes, we design transceiver models of MC-CDMA based on graph theory, and use low density Tanner graph to describe relationship between spreading chips and data symbols. In addition, message passing algorithm, which is suitable for the Tanner graph, is utilized to perform iterative multiuser detection. Flooding and serial schedules for the message passing are deduced and analyzed. Simulations show that under overloading conditions, conventional MC-CDMA cannot perform well, while our proposed low density Tanner graph for MC-CDMA achieves satisfactory performance. Such result is useful for the design of next generation mobile networks. |
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| Keywords: | Tanner graph MC-CDMA iterative detection message passing schedule |
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