基本LS(link space code)码具有“零相关窗”(IFW)且被用于传统大区域同步码分多址系统(LAS-CDMA),但其零相关窗的分布是不均匀的.对基本LS码片用矩阵中克罗内克积方法重新排列,得到了一类新的LS码,从数学上证明了这类新码非周期自相关...基本LS(link space code)码具有“零相关窗”(IFW)且被用于传统大区域同步码分多址系统(LAS-CDMA),但其零相关窗的分布是不均匀的.对基本LS码片用矩阵中克罗内克积方法重新排列,得到了一类新的LS码,从数学上证明了这类新码非周期自相关函数具有均匀的IFW,以及组内码字之间的IFW也是均匀分布的.码组间的非周期互相关函数具有均匀分布的IFW,或者完美理想互补的特点.计算机仿真结果验证了新码性质的正确性.展开更多
In a quasi-synchronous code division multiple access(QS-CDMA) system, the correlation functions around the origin influence the system performance and odd functions are as important as the even functions. Three kinds ...In a quasi-synchronous code division multiple access(QS-CDMA) system, the correlation functions around the origin influence the system performance and odd functions are as important as the even functions. Three kinds of zero correlation zone(ZCZ) sequences are used to analyze and compare the correlation functions. Binary phase shift keying(BPSK) simulations of QS-CDMA system with the three kinds of QS sequences as spreading codes on additive white Gaussian noise(AWGN) channel show that these sequences are quasi-orthogonal, so they are suitable for QS-CDMA system. The correlation between the system performance and the zero correlation zone of the sequence is also proved.展开更多
文摘基本LS(link space code)码具有“零相关窗”(IFW)且被用于传统大区域同步码分多址系统(LAS-CDMA),但其零相关窗的分布是不均匀的.对基本LS码片用矩阵中克罗内克积方法重新排列,得到了一类新的LS码,从数学上证明了这类新码非周期自相关函数具有均匀的IFW,以及组内码字之间的IFW也是均匀分布的.码组间的非周期互相关函数具有均匀分布的IFW,或者完美理想互补的特点.计算机仿真结果验证了新码性质的正确性.
基金National Natural Science Foundation of China(60502016)
文摘In a quasi-synchronous code division multiple access(QS-CDMA) system, the correlation functions around the origin influence the system performance and odd functions are as important as the even functions. Three kinds of zero correlation zone(ZCZ) sequences are used to analyze and compare the correlation functions. Binary phase shift keying(BPSK) simulations of QS-CDMA system with the three kinds of QS sequences as spreading codes on additive white Gaussian noise(AWGN) channel show that these sequences are quasi-orthogonal, so they are suitable for QS-CDMA system. The correlation between the system performance and the zero correlation zone of the sequence is also proved.