| CDMA系统中MAP迭代多码检测技术的研究 |
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| 引用本文： | 董江波,王刚,李道本.CDMA系统中MAP迭代多码检测技术的研究[J].北京邮电大学学报,2004,27(6):59-63. |
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| 作者姓名： | 董江波 王刚 李道本 |
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| 作者单位： | 北京邮电大学 信息工程学院, 北京 100876 |
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| 摘 要： | 给出了多径衰落信道下一种与前向纠错码相结合的迭代多码检测接收机,它基于最大后验概率准则联合检测多个码字所承载的信息,并与FEC(前向纠错编码)译码器相互传递软信息,重复多次进行迭代检测。在QPSK(四相频移键控)调制方式下通过LAS-CDMA(大区制同步码分多址)系统的仿真,表明所提出的迭代多码检测接收机即使在高维调制方式下依然可以获得显著的迭代增益,并且在迭代一定次数之后可以达到单码传输的性能。
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| 关 键 词： | 迭代多码检测 软信息 迭代增益 单码传输 |
| 文章编号： | 1007-5321(2004)06-0059-05 |
| 收稿时间： | 2003-10-29 |
| 修稿时间： | 2003年10月29日 |
Iterative MAP Multi-Code Detection for CDMA System |
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| DONG Jiang-bo,WANG Gang,LI Dao-ben.Iterative MAP Multi-Code Detection for CDMA System[J].Journal of Beijing University of Posts and Telecommunications,2004,27(6):59-63. |
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| Authors: | DONG Jiang-bo WANG Gang LI Dao-ben |
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| Affiliation: | Info rmat ion Engineering School , Bei jing Universi t y of Pos ts and Tel ecomm unicati ons, Beijing 100876, China |
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| Abstract: | The iterative multi-code detection for LAS-CDMA(large area synchronization-code division multi-access) system based on MAP(maximum posterior probability) criterion is studied in this paper. It interchanges the soft information between multi-code detection and channel decoder each other for several times. The iterative detector for non-binary modulation in multi-path fading channel is proposed and the simulation results indicate that the proposed detector can even achieve single-code transmission performance when the iteration times is higher than 3 for QPSK(quadri phase shift key) modulation. |
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| Keywords: | iterative multi-code detection soft information iterative gain single code transmission |
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