【摘要】 近年来准同步CDMA(QS-CDMA)系统引起了人们的广泛关注,这是因为在这种系统中应用零相关区(ZCZ)序列作为其扩频序列集,可以减小甚至消除多址干扰和多径干扰。Matsufuji、Tang和Hayashi分别研究了由最佳序列和正交矩阵构造最佳零相关区序列集的方法。改进了Hayashi的方法,利用最佳序列和一个2阶或3阶正交矩阵构造最佳零相关区序列集。该方法使用更加方便,扩大了基于最佳序列和正交矩阵构造最佳零相关区序列集的方法的适用范围。更多还原

【Abstract】 Recently,quasi-synchronous CDMA (QS-CDMA) systems have attracted a great deal of attention.In QS-CDMA systems,zero correlation zone (ZCZ) sequences are used as spreading sequences in order to eliminate the multiple access interference and multipath interference.Based on perfect sequences and orthogonal matrices,Matsufuji,Tang and Hayashi propose several methods for constructing optimal ZCZ sequence sets.In this paper,we propose a new method which is an improvement of Hayashi’s method.The method is based on perfect sequences and orthogonal matrices of size 2×2 or 3×3.These ZCZ sequence sets generated by the proposed method are optimal with respect to the theoretic bound.The proposed method can be used to construct optimal ZCZ sequence sets with wider range of available periods and width.更多还原