一种改进的扩频系统码捕获方法及其性能分析

Performance of a modified code-acquisition for DSSS

本文在传统匹配器滤波码捕获扩频通信系统基础上提出一种新的改进方法,该方法的原理是在相关单元和平方单元间增加一根延迟线。经仿真分析比较,这种改进的方法比传统方法在相同信噪比下有更低的虚警概率和更高的检测概率。本文还计算仿真了其平均捕获时间,并与传统模型进行比较。文章最后给出整体捕获仿真结果,仿真表明了该方法的有效性,且只有增加很少的硬件资源消耗。改进系统的总体性能要优于传统模型,其在实际工程应用中有着重要意义。

This paper introduces a new modified method based on traditional matched-filter code acquisition in spread spectrum communication system,it adds a delay-line between correlation unit and squaring unit.After simulation and compare,we know when it is in the same SNR,the modified method has higher detection probability and lower false alarm probability.In this paper,we also compute and simulate the mean acquisition time,then compare it with traditional model.At last,the simulation result of the whole acquisition system is provided,it shows the proposed method is effective which only adds little hardware cost.The performance of the modified system is more effective than traditional one,it is important in practical application.