计算机工程

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基于OCML模型的CDMA系统长短码生成方法

万茜,陈朝,陈彬,毛明慧   

  1. (中国地质大学(武汉)机械与电子信息学院,武汉 430074)
  • 收稿日期:2015-03-30 出版日期:2016-05-15 发布日期:2016-05-13
  • 作者简介:万茜(1990-),女,硕士研究生,主研方向为混沌通信;陈朝(通讯作者),副教授、博士;陈彬、毛明慧,硕士研究生。
  • 基金项目:
    湖北省自然科学基金资助面上项目“基于单项耦合映像格子的空时编码的研究”(2014CFB896)。

Long and Short Codes Generation Method for CDMA System Based on OCML Model

WAN Xi,CHEN Zhao,CHEN Bin,MAO Minghui   

  1. (Faculty of Mechanical and Electronic Information,China University of Geosciences(Wuhan),Wuhan 430074,China)
  • Received:2015-03-30 Online:2016-05-15 Published:2016-05-13

摘要: 讨论时空混沌序列的生成方法并比较分析其作为扩频码的性能优势,为降低单向耦合映像格子(OCML)模型中格点间隔的相关度,提出一种基于模型空间维度的随机格点间隔方法,对系统空间维度分区段,在各区段内随机选取下一时刻序列的格点坐标,并行产生多条随机性好的混沌序列,从而得到码分多址(CDMA)系统的长短码。Simulink仿真结果表明,时空混沌OCML模型因其多维及高复杂度的特性,可同时产生并行性较好的伪随机序列用作CDMA系统的长短码。

关键词: 时空混沌, 单向耦合映像格子模型, 格点间隔, 长码, 短码, 码分多址

Abstract: In this paper,the spatiotemporal chaotic sequence generation method and its advantages of performance as spreading codes are comparatively analyzed.To weaken the correlation of lattice space in One-way Coupled Map Lattice(OCML) model,a method of random lattice point intervals is proposed.In this method,space lattices are divided into several segments.The lattice coordinates of next time sequence are always randomly selected in each segment,and several chaotic sequences of good parallel architecture are produced.With this method,two short codes and one long code of Code Division Multiple Access(CDMA) system are generated,and they are simulated by Simulink to verify the feasibility of the method.The results show that the OCML model with high complexity and multi-dimensional characteristics can produce pseudo-random sequences which perform better as in spread spectrum codes in CDMA system.

Key words: spatiotemporal chaos, One-way Coupled Map Lattice(OCML) model, lattice space, long code, short code, Code Division Multiple Access(CDMA)

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