Construction of a Near-Optimal Quasi-Complementary Sequence Set from Almost Difference Set

Compared with the perfect complementary sequence sets, quasi-complementary sequence sets (QCSSs) can support more users to work in multicarrier CDMA communications. A near-optimal periodic QCSS is constructed in this paper by using an optimal quaternary sequence set and an almost difference set. With the changes of the values of parameters in the QCSS, the number of users supported by the subcarrier channels in CDMA system has an exponential growth.