Aperiodic complementary sequence sets (ACSS) with zero correlation zone (ZCZ) over 8-QAM+ constellation are defined as 8-QAM+ Z-ACSS. New shift vectors and mappings are used to transform perfect ternary sequences to 8-QAM+ orthogonal sequences, meanwhile based on p-phase orthogonal sequence sets, p=2, 3, 4, 8-QAM+ Z-ACSS are constructed by interleaving operation in this paper. The parameters of the resultant 8-QAM+Z-ACSS can be set flexibly to achieve the theoretical bound, which means the Z-ACSS proposed are optimal. 8-QAM+ Z-ACSS can be used in quasi-synchronous CDMA (QS-CDMA) communication systems with high transmission data rate (TDR) and multi-users to remove the multiple access interference (MAI) and multi-path interference (MPI).
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