摘要
阐述了扩频通信系统中伪码捕获的基本原理,分析了传统的基于噪声功率检测的自适应门限设定方法。针对现有捕获策略的研究重点主要集中在固定门限和自适应门限设定方面,提出了一种可以同时自适应调整非相干累加次数和门限值的捕获方案。详细介绍了新方案的结构和相应的自适应算法,给出了其捕获性能的仿真结果。通过和传统自适应门限方案的对比表明新方案在低信噪比情况下的捕获性能明显优于传统方案,大大扩展了捕获系统的动态范围。
The basic theory of the PN code acquisition in spread communication systems was proposed,while the method of adaptive threshold based on the detection of noise power was analyzed.Based on that,the keypoints of the existed papers are the fixed threshold and the adaptive threshold.The improved acquisition method was proposed,which could adjust both the times of non-coherent integration and the threshold.The new method＇s frame and adaptive algorithm were researched in detail.Simulated results of the traditional method and the improved method were compared,which proves the excellence of the new method in the low SNR.So the dynamic range of aquisition systems can be expanded largely by the new method.
出处
《系统仿真学报》
CAS
CSCD
北大核心
2011年第4期817-821,共5页
Journal of System Simulation
基金
国家863计划资助项目(2007AA12Z343)
关键词
扩频通信
捕获
自适应
非相干累加
门限
spread spectrum communication
acquisition
adaptive
non-coherent integration
threshold
