一种达到理论上限的新型扩频序列集

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

在准同步CDMA系统中,使用零相关区域(ZCZ)序列能够避免共信道冲突和多址干扰。应用序列偶理论,结合ZCZ序列的相关特性,定义了一种适用于准同步CDMA系统的新型扩频序列集———ZCZ序列偶集合。给出了该集合的理论限,并提出了一种构造ZCZ序列偶集合的递归法,该方法在初始序列参数满足一定条件时可以得到达到理论上限的ZCZ序列偶集合。结果表明,ZCZ序列偶集合是一种特殊的二元零相关区序列,它的性能优良,适于作准同步CDMA系统的扩频序列。

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.