New ZCZ sequence sets composed of two subsets

The present paper proposes new ZCZ sequence sets which consist of two subsets. The most important property of the proposed ZCZ sequence sets is that the cross-correlation function between two arbitrary sequences which belong to different subsets has quite a large zero-cross-correlation zone. Of course, each subset is a ZCZ sequence set of which the family size is half of the original one. When the proposed ZCZ sequence sets are applied to AS-CDMA systems, one subset is assigned to users near to a base station and another subset is assigned to users far from it. By this allotment, the proposed sets can hypothetically achieve larger zero-correlation zones than conventional ZCZ sequence sets.