摘要
设计一种针对基于FFT的PN码捕获自适应门限技术,对高斯环境下信号统计特性进行了推导,得出了适用于恒虚警概率自适应门限算法的统计量,并用最大似然准则对统计量进行参数估计。最后仿真验证表明,该方法适合在低信噪比环境下完成PN码捕获。
A method of adaptive threshold for PN acquisition based on FFT is proposed in this paper.The decision variable was calculated from sample value with the ML criterion.Mathematical model of this method was derived and the performance of the method in Gaussian white noise conditions was given.The result shows that the proposed method is fit for PN acquisition in low SNR.
出处
《电子质量》
2011年第1期16-17,共2页
Electronics Quality
关键词
直扩
PN码
自适应门限
快速傅立叶变换
direct sequence spread spectrum
PN code
adaptive threshold
FFT
