摘要
针对基于辅助序列快捕算法在初始相位偏差较大情况下降导致捕获速度变慢的缺陷,在相位预估器的相干PN序列快捕算法基础上,将最优化搜索引入PN码快捕算法中,提出了一种基于相位预估和最优搜索的相干PN序列快捕算法,通过建立马尔可夫链模型,推导出平均捕获时间及其方差的解析式。仿真结果表明,该算法能有效提高捕获性能,实用性强。
The acquisition algorithm presented in [3] degressed when intial phase is inaccurate.We propose a optimum searching method with a Pre-loop Phase Estimator for the fast-acquisition of PN code, the analytic formulation of mean acquisition time and variance is derived by Marokv Model. And the performance of acquisition is simulated in AWGN channel. The result of computer simulation indicates that the algorithm can improve the performance and be more practical.
出处
《系统仿真学报》
CAS
CSCD
北大核心
2009年第22期7310-7312,共3页
Journal of System Simulation
关键词
直序扩频系统
相位预估
最优搜索
快速捕获
Direct Sequence Spread-Spectrum Systems
Pre-Loop Phase Estimator
optimum searching
fast-acquisition
