ZCZ序列偶集及大容量ZCZ序列偶集的构造  

Construction of ZCZ Sequence Pairs Set and ZCZ Sequence Pairs Set with Large Family Size

作　　者：肖丽萍[1] 李卫卫[1] 许成谦[1] 

机构地区：[1]燕山大学信息科学与工程学院,河北秦皇岛066004

出　　处：《北京邮电大学学报》2010年第5期89-93,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(60872061);河北省自然科学基金项目(F2008000855)

摘　　要：为了降低甚至消除近似同步码分多址(AS-CDMA)系统的多径干扰和多址干扰(MAI),满足系统不断增大的用户容量需要,提出了新的零相关区(ZCZ)序列偶集及大容量ZCZ序列偶集的构造方法.通过对最佳序列偶进行不同的移位,再与一定阶数的酉矩阵进行相关积运算,构造出了近似最优及最优2类ZCZ序列偶集;通过对已有的ZCZ序列偶集进行适当的移位再与相应的酉矩阵进行相关积运算,构造出了更大容量和更长零相关区的ZCZ序列偶集.本文方法适用于二元、三元、四相及多相情况.构造出的ZCZ序列偶集性能优良,在同步误差允许的范围内,能满足多用户AS-CDMA系统的要求.A New method for constructing set of zero correlation zone （ZCZ） sequence pairs and ZCZ se- quence pairs with large family size is proposed. It can be used in approximately-synchronized code-division multiple-access （AS-CDMA） system for the reduction or elimination of the muhipath interference and multiple access interference （MAI） of the system. The capacity of increasing users is large with sat- isfactory. First, almost optimal ZCZ sequence pairs set can be generated from the correlation product of unitary matrix and perfect sequence pairs with difference shift operation. Second, a new method for con- structing ZCZ sequence pairs set with larger family size and longer zero correlation zone from a known one is presented, it can be generated from the correlation product of unitary matrix and original ZCZ sequence pairs set with difference shift operation. These methods are applied to binary, ternary quadric-phase and multi-phase case. Performances of ZCZ sequence pairs set constructed by the proposed methods are so good that they can satisfy requirements of AS-CDMA system within the range of allowed time delay chips.

关 键 词：近似同步码分多址 最佳序列偶 零相关区 相关积 酉矩阵 

分 类 号：TN911.22[电子电信—通信与信息系统]