一种PN码自适应捕获门限的改进算法

A improved algorithm of adaptive threshold in acquisition of PN code

文献[1]提出了一种用于直扩系统的PN码自适应门限算法。但该文献也指出,此算法对门限总数十分敏感。当门限总数设置不当时,系统的平均捕获时间将显著增加。这限制了该算法在实际中的应用。本文就此提出了改进,给出了算法及电路框图。仿真结果表明,与原方案相比,改进算法改善了对门限总数的敏感性,降低了PN码平均捕获时间。

Literature [ 1 ] presented an algorithm of setting adaptive threshold to acquire PN code. But the literature also pointed out this model is very sensivive to the number of the thresholds. When the number is not suitable, the average acquisitive time will increase strongly. So the weakness limits this model＇ s application. In this article, we present a improved algorithm, and also presented its circuit diagram. The result of simulation proves that our algorithm meliorates the old model＇ s sensitivity to the number of the thresholds, and decreases average acquisitive time.