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计算机工程 ›› 2019, Vol. 45 ›› Issue (1): 61-66. doi: 10.19678/j.issn.1000-3428.0048779

• 移动互联与通信技术 • 上一篇    下一篇

利用三阶特征信息的多速率LC-DS-CDMA信号扩频码估计

强芳芳a,赵知劲b   

  1. 杭州电子科技大学 a.电子信息学院; b.通信工程学院,杭州310018
  • 收稿日期:2017-09-25 出版日期:2019-01-15 发布日期:2019-01-15
  • 作者简介:强芳芳(1992—),女,博士研究生,主研方向为信号处理;赵知劲,教授、博士
  • 基金资助:

    国家自然科学基金“非周期扩频信号多伪码盲估计技术研究”(61571172)

Spreading Code Estimation of Multi-rate LC-DS-CDMA Signal Using Triple Feature Information

QIANG Fangfang a,ZHAO Zhijin b   

  1. a.College of Electronic and Information; b.College of Communication Engineering, Hangzhou Dianzi University,Hangzhou 310018,China
  • Received:2017-09-25 Online:2019-01-15 Published:2019-01-15

摘要:

针对多速率长码直扩码分多址(LC-DS-CDMA)信号的扩频码估计问题,提出一种利用三阶相关特征信息的匹配估计法。利用m序列三阶相关函数峰值点具有唯一性的特点,构建周期与非周期多速率LC-DS-CDMA信号的三阶相关特征信息矩阵。根据接收信号的长度判断信号的周期性,估计相应接收信号的延迟三阶相关列向量。与相应的特征信息矩阵作匹配运算并对匹配结果进行归一化,完成接收信号中各用户的扩频码估计。仿真结果表明,该方法能够有效估计多速率LC-DS-CDMA信号的扩频码,相比盲源分离法具有更高的正确估计率。

关键词: 多速率信号, 长码直扩码分多址, 三阶相关, 特征信息匹配, 扩频码估计

Abstract:

Aiming at the problem of spreading code estimation of multi-rate Long Code Direct Sequence Code Division Multiple Access (LC-DS-CDMA) signal,a matching estimation method based on triple correlation feature information is proposed.Considering the uniqueness of the peak value of the triple correlation function of m-sequence,the triple correlation characteristic information matrix of periodic and aperiodic multi-rate LC-DS-CDMA signals is constructed.According to the length of the received signal,the periodicity of the received signal is judged,and the triple correlation column vector of the corresponding received signal is estimated.By matching with the corresponding characteristic information matrix and normalizing the matching results,the spreading code estimation of each user in the received signal is completed.Simulation results show that the proposed method can effectively estimate the spreading code of multi-rate LC-DS-CDMA signal,and the correct estimation rate is higher than using the blind source separation method.

Key words: multi-rate signal, Long Code Direct Sequence Code Division Multiple Access (LC-DS-CDMA), triple correlation, feature information matching, spreading code estimation

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