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A Novel Spread Spectrum Sequence Set up to Upper Bound of Theory

LIANG Qing-mei1,LIU Jin-ming1,XU Cheng-qian2(1.The College of Information Science and Technology,HLJ August First Land Reclamation University,Daqing Helongjiang 163319,China;2.The College of Information Science and Engineering,YanShan University,Qinhuangdao Hebei 066004,China)  
In the quasi-synchronous CDMA systems,using the ZCZ sequences can avoid the co-channel interference and multi-access interference.This paper uses the theory of sequence pairs and integrates the relevant features of ZCZ sequence to define a novel spread spectrum sequence set,i.e.ZCZ sequence pairs set,which applies to the quasi-synchronous CDMA systems,and the bound of theory is demonstrated.In addition,a recursion method for constructing ZCZ sequence pairs set is presented,and ZCZ sequence pairs set constructed by this method can get the upper bound when the parameters of the initialization sequence satisfy some conditions.The result indicates that the ZCZ sequence pair set is a special binary zero correlation sequence.At the same time,its performance is perfect,it can be used as the spread spectrum sequence in the quasi-synchronous CDMA system.
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