摘要
蜂窝技术在码分多址(code division multiple access,CDMA)系统中起着非常重要的作用.本文给出了用于构造CDMA规则蜂窝系统正交序列集的不同函数.首先,基于多输出semi-bent函数的性质,给出了一个构造编码长度为2~6的蜂窝系统.研究发现,通过选取不同的参数d(d∈{2,3}),所构造蜂窝系统的蜂窝排列难易程度和重用距离可以相应的调整.其次,利用"直和构造"将semi-bent函数变元增加,进而得到编码长度为2~n(n≥6且为偶数),重用距离D≥4的规则蜂窝系统.研究表明,所构造的蜂窝系统内,每个蜂窝所包含的正交序列个数达到了2^(n-2)(即与目前已知的最好结果相同).
The cellular technology plays an important role in the code division multiple access(CDMA)system.In this paper,we present a different function for constructing orthogonal sequence set of CDMA system.Firstly,based on the properties of multi-dimension semi-bent function,we presented a cellular system with the code length of 2~6.By choosing different parameter d(d∈{2,3}),we can assign the sets of orthogonal sequences to a regular tessellation of hexagonal cells more easily and adjust the re-use distance accordingly.Secondly,the number of variables of this semibent function increases by using direct sum construction and then a regular tessellation of hexagonal cells with the length of 2~n(n≥6,even)is obtained.It is showed that the number of users per cell reaches 2^(n-2)(which achieves the same as the best known results).
作者
季霄鹏
夏士雄
张凤荣
JI Xiaopeng;XIA Shixiong;ZHANG Fengrong(School of Computer Science and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China)
出处
《武汉大学学报(理学版)》
CAS
CSCD
北大核心
2018年第2期175-182,共8页
Journal of Wuhan University:Natural Science Edition
基金
国家重点研发计划项目(2016YFC0600908)
国家自然科学基金资助项目(61303263)
关键词
布尔函数
码分多址
正交序列
semi-bent函数
Boolean function
CDMA(code division multiple access)
orthogonal sequence
semi-bent function