摘要
基于线性调制信号的循环平稳特性,卫星信道多普勒频移的估计可以通过求解发送信号与接收信号的循环相关函数关系得到。借助循环谱函数推导出发送信号的循环相关函数,接收信号的循环相关函数则对信号本身及其有限差分进行计算。仿真结果说明了该算法对信道中的干扰与噪声不敏感,在多普勒频移较大时,该算法具有良好的估计精度;同时该算法还具有低复杂度和应用灵活的特点。
Based on the inherent cyclostationarity of linear modulated signals,the Doppler shift estimation of satellite channel could be derived from cyclic correlations of transmitted and received signals.In which the former cyclic correlation could be attained by use of cyclic spectrum function and the latter could be gained from received signals and their finite difference.Simulation results show its nonsensibility to additive stationary noise and interference and its better precision when Doppler shift is large.Meanwhile,the estimator is characteristic of low complexity and smart application.
出处
《火力与指挥控制》
CSCD
北大核心
2013年第6期128-132,共5页
Fire Control & Command Control
关键词
卫星信道
多普勒频移
盲估计
循环平稳
循环相关函数
satellite channel
doppler shift
blind estimation
cyclostationarity
cyclic correlations
