In quasi-synchronous code-division multiple-access (QS-CDMA) system

Gaussian integer sequences with zero correlation zone (ZCZ) used as address sequences can not only suppress the multiple access interference (MAI) and the multipath interference (MPI)

but also possess higher spectrum efficiency and transmission bit rate. However

the construction of the sequences is limited at present. In order to solve the problem

this paper presents a method of constructing Gaussian integer sequence sets with ZCZ and perfect Gaussian integer sequences by filtering operation. Based on perfect sequences and periodic sequence sets with ZCZ

the optimal or almost optimal Gaussian integer ZCZ sequence sets can be obtained. Meanwhile

based on perfect sequences

a class of perfect Gaussian integer sequences with odd or even period is constructed. The achieved results of this paper provide more address selection space for high-speed QS-CDMA system.