More Quasi-Complementary Sequence Sets from Difference Sets and Almost Difference Sets

A quasi-complementary sequence set (QCSS) is a set of two-dimensional matrices which has low correlation sums of rows for all non-trivial time shifts. In multi-carrier code-division multiple-access (MC-CDMA) communications, QCSSs can be utilized to achieve low interference performance. In this paper, constructions of periodic QCSSs are proposed by using difference sets and almost difference sets. We remark that the periodic QCSSs obtained from this paper are asymptotically optimal and with new parameters.