Quasi-complementary sequence sets (QCSSs) have attracted sustained research interests for simultaneously supporting more active users in multi-carrier code-division multiple-access (MC-CDMA) systems compared to complete complementary codes (CCCs). In this paper, we investigate a novel class of QCSSs composed of multiple CCCs. We derive a new aperiodic correlation lower bound for this type of QCSSs, which is tighter than the existing bounds for QCSSs. We then present a systematic construction of such QCSSs with a small alphabet size and low maximum correlation magnitude, and also show that the constructed aperiodic QCSSs can meet the newly derived bound asymptotically.

翻译：准互补序列集（QCSSs）因在多载波码分多址（MC-CDMA）系统中能比完全互补码（CCCs）支持更多活跃用户而持续受到研究关注。本文研究了一类由多个CCC组成的新型QCSS。针对此类QCSS，我们推导了新的非周期相关性下界，其紧致性优于现有QCSS界。随后提出了具有小字母表尺寸和低最大相关幅度的系统性构造方法，并证明所构造的非周期QCSS可渐近达到新推导的界。