J4 ›› 2009, Vol. 36 ›› Issue (4): 730-735.

• 研究论文 • 上一篇    下一篇

一种改进的多用户DCSK性能分析

周志波;周童;王进祥   

  1. (哈尔滨工业大学 微电子中心,黑龙江 哈尔滨  150001)
  • 收稿日期:2008-04-24 出版日期:2009-08-20 发布日期:2009-09-28
  • 通讯作者: 周志波

Performance analysis of an improved multiple-access differential chaos shift keying

ZHOU Zhi-bo;ZHOU Tong;WANG Jin-xiang   

  1. (Microelectronics Center, Harbin Inst. of Tech., Harbin  150001, China)
  • Received:2008-04-24 Online:2009-08-20 Published:2009-09-28
  • Contact: ZHOU Zhi-bo

摘要:

提出一种基于混沌二进制序列及Walsh码的多用户差分混沌键控通信系统.在此系统中,发送端的信号及对应的接收端的信号分别与相同的Walsh码相乘,由于混沌二进制信号的瞬时功率为常值以及Walsh码的正交特性使得用户之间的干扰得到抑制,因此系统具有了多址特性.分析了系统在高斯信道中的特性,给出了误码率公式.仿真结果与理论值相符合,证明了理论分析的正确性.在高斯信道下与其他多用户差分混沌键控系统的性能作了对比,当所有用户使用不同的混沌初始值时,系统的性能与其他的多用户差分混沌键控系统性能相当.系统采用固定延迟及处理的数据为二进制形式,因此相比其他多用户差分混沌键控,本系统结构简单且易于实现.

关键词: 差分混沌键控, 多址, 混沌通信, 误码率

Abstract:

A new kind of multiple-access differential chaos shift keying (MA-DCSK) is presented which is based on the chaotic binary sequence and Walsh code. In the proposed system, the signals in the transmitter and the corresponding receiver are multiplied by the same Walsh code. Due to the constant instantaneous power of the chaotic binary signal and the Walsh code orthogonality, the interference between users will be greatly reduced. So, this kind of MA-DCSK has the multiple-access ability. The bit error rate (BER) performance is analyzed and the BER formula is evaluated. Simulation results match the numerical ones well, which supports the theoretical analysis. The performance is compared with that of other kinds of MA-DCSK in the additive white Gaussian noise (AWGN) channel. It is shown that the proposed MA-DCSK system is comparable to other MA-DCSK systems as all users use the different chaotic initial values. Compared to other MA-DCSK systems, the structure of the proposed system is simpler and more feasible to be implemented since the delays are invariant and the data to be processed is a kind of antipodal binary.

Key words: differential chaos shift keying, multiple-access, chaos communication, bit error rate

中图分类号: 

  • TN9141. 42