设计出扩展的Large area Synchronization地址码(LS码)——Daoben Lab地址码(DBL码).DBL码由基本LS码与矩阵左、右直积生成,分别称为DBL左乘码和DBL右乘码,两类DBL码各有特点.DBL右乘码特点是把码字分组,码组间码字存在更大的零相关窗,...设计出扩展的Large area Synchronization地址码(LS码)——Daoben Lab地址码(DBL码).DBL码由基本LS码与矩阵左、右直积生成,分别称为DBL左乘码和DBL右乘码,两类DBL码各有特点.DBL右乘码特点是把码字分组,码组间码字存在更大的零相关窗,增加了可用码字数,码组内码字非周期相关性与扩展矩阵行向量的相关性相同;DBL左乘码也是把码字分组,码组间的零相关窗长度不变,没有增加可用码字数,但当以正交矩阵扩展时,码组内有和原LS码同样长度的零相关窗.计算机仿真验证了两类DBL地址码的性质.展开更多
Zero correlation window （ZCW） or zero correlation zone （ZCZ） sequence can be used in quasi-synchronous code division multiple access （QS-CDMA） system to eliminate multiple access and multipath interferences. How...Zero correlation window （ZCW） or zero correlation zone （ZCZ） sequence can be used in quasi-synchronous code division multiple access （QS-CDMA） system to eliminate multiple access and multipath interferences. However, as the length of ZCW or ZCZ increases, fewer sequences are available. Recently, a new concept, sequence set with group-wise zero correlation window is introduced, which can increase the number of available sequences for a QS-CDMA system. In this article, a new method for generating sequence set with group-wise zero correlation window is presented. This method is based on a Hadamard matrix of size N×N and a pair of Hadamard matrices of size M×M. Compared with previous methods, the proposed sequence set has a group-wise zero correlation window for both periodic and aperiodic cross-correlation functions.展开更多
A new class of loosely synchronous(LS)spreading sequences with zero correlation window(ZCW)was presented.It was constructed by making Kronecker product of orthogonal matrix and ZCW complementary sequences.This new LS ...A new class of loosely synchronous(LS)spreading sequences with zero correlation window(ZCW)was presented.It was constructed by making Kronecker product of orthogonal matrix and ZCW complementary sequences.This new LS sequence increases the number of perfect complementary pairs and extends ZCW within the same group.Moreover,both auto-correlation and cross-correlation of ZCW in the same group remain identical.The minimum ZCW among different groups is the same as that of basic LS sequences.The method for constructing these new LS sequences is presented and ZCW properties are also verified.The number of these new LS sequences is only smaller than theoretical upper bound by one.展开更多
文摘设计出扩展的Large area Synchronization地址码(LS码)——Daoben Lab地址码(DBL码).DBL码由基本LS码与矩阵左、右直积生成,分别称为DBL左乘码和DBL右乘码,两类DBL码各有特点.DBL右乘码特点是把码字分组,码组间码字存在更大的零相关窗,增加了可用码字数,码组内码字非周期相关性与扩展矩阵行向量的相关性相同;DBL左乘码也是把码字分组,码组间的零相关窗长度不变,没有增加可用码字数,但当以正交矩阵扩展时,码组内有和原LS码同样长度的零相关窗.计算机仿真验证了两类DBL地址码的性质.
基金supported by the National Natural Science Foundation of China(60272026,60872061)the PhD Programs Foundation of Ministry of Education of China(20060216010)the Scientific Research Foundation for the Returned Overseas Chinese Scholars,Ministry of Education of China
文摘Zero correlation window （ZCW） or zero correlation zone （ZCZ） sequence can be used in quasi-synchronous code division multiple access （QS-CDMA） system to eliminate multiple access and multipath interferences. However, as the length of ZCW or ZCZ increases, fewer sequences are available. Recently, a new concept, sequence set with group-wise zero correlation window is introduced, which can increase the number of available sequences for a QS-CDMA system. In this article, a new method for generating sequence set with group-wise zero correlation window is presented. This method is based on a Hadamard matrix of size N×N and a pair of Hadamard matrices of size M×M. Compared with previous methods, the proposed sequence set has a group-wise zero correlation window for both periodic and aperiodic cross-correlation functions.
基金supported by the National Natural Science Foundation of China(Grant No.90604035).
文摘A new class of loosely synchronous(LS)spreading sequences with zero correlation window(ZCW)was presented.It was constructed by making Kronecker product of orthogonal matrix and ZCW complementary sequences.This new LS sequence increases the number of perfect complementary pairs and extends ZCW within the same group.Moreover,both auto-correlation and cross-correlation of ZCW in the same group remain identical.The minimum ZCW among different groups is the same as that of basic LS sequences.The method for constructing these new LS sequences is presented and ZCW properties are also verified.The number of these new LS sequences is only smaller than theoretical upper bound by one.
