A New Rapid Acquisition Technique for Direct Sequence Spread-Spectrum Communications
A New Rapid Acquisition Technique for Direct Sequence Spread-Spectrum Communications
复制标题
一种新的直接序列扩频通信快速采集技术
DOI：
10.1109/tcom.1984.1095984
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
D. Schilling
中科院分区：
文献类型：
--
作者：
S. Davidovici;L. Milstein;D. Schilling
本文介绍一种可用于直接序列扩频系统的快速捕获技术。它本质上是连续的，并基于一个双重阈值，该阈值定义了何时可以做出决定。阈值的值在每个检查时刻改变。该过程利用了PN序列的部分互相关函数的界限，这确保了就PN序列细节而言，仅需要给出序列长度。只有当与该点处的决策相关联的错误概率等于或优于预先指定的值时，才做出决策。最后，它表明，大多数的计算困难与界所给出的递归算法可以消除时，使用低阶多项式逼近的界限。然而，无论是通过使用界或其多项式近似，在获取时间的显着改善。
This paper describes a rapid acquisition technique which can be used in direct sequence spread-spectrum systems. It is sequential in nature and is based on a double threshold which defines when a decision can be made. The values of the thresholds change at every examination instant. The procedure makes use of a bound to the partial crosscorrelation function of PN sequences which ensures that only the sequence length needs to be given as far as the PN sequence particulars are concerned. A decision is made only if the probability of error associated with a decision at that point is equal to or better than a prespecified value. Finally, it is shown that most of the computational difficulties associated with the bound as given by a recursive algorithm can be eliminated when using a low-order polynomial approximation to the bound. However, either by using the bound or its polynomial approximation, a significant improvement in the acquisition time is obtained.