摘要
本文提出用改进型分段线性混沌映射来产生DS -CDMA系统的直扩码 ;分析了这类直扩码的特性以及两种量化函数对其特性的影响 ;计算机仿真结果表明 ,在适当的初值条件下这类序列具有周期长、平衡性好、自相关函数较尖锐、互关值较小以及线性复杂度高等特性 ,适合用作DS CDMA系统直扩码 .
The improved piecewise linear chaotic mapping is presented to generate the spreading codes for DS-CDMA system. The spreading properties and the effects of two quantification functions on the spreading properties are analyzed. The simulation results show that the sequences have long period, good balance, δ-like auto-correlation and very small cross-correlation and great linear complexity under the condition of the proper initial values and are suitable to be used as the spreading codes for DS-CDMA.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2004年第10期1684-1687,共4页
Acta Electronica Sinica
基金
电子对抗国防科技重点实验室项目资助
关键词
改进型分段线性混沌序列
直扩码
DS-CDMA
量化函数
Calculations
Codes (symbols)
Computer simulation
Direct sequence systems
Functions
Spread spectrum communication
Theorem proving
