摘要
为了解决低信噪比条件下载波频偏估计中估计范围和估计精度的矛盾,在比较分析现有经典估计方法的基础上,提出了一种改进的Fitz载波频偏估计方法,利用自相关序列差分代替自相关序列相位估计频偏。此方法将频偏估计范围提高到数据速率的一半,同时又保持了原有Fitz方法的低信噪比门限。通过仿真验证了改进频偏估计方法对大频偏和低信噪比的适用性。
In order to solve the problem of the contradiction between capturing range and estimation accuracy of frequency offset estimationmethods for lowsignal to noise ratio（SNR） condition,an improved Fitz frequency offset estimation method is proposed.The phase of autocorrelation sequence is replaced with autocorrelation sequence difference to estimate frequency offset.The improved estimation method extends its estimation range to a half data rate,at the meantime,its SNR threshold is as low as the Fitz method.The applicability of the improved method for large frequency offset and lowSNR is verified by simulation.
出处
《电讯技术》
北大核心
2012年第10期1582-1585,共4页
Telecommunication Engineering
关键词
载波同步
频偏估计
大频偏
低信噪比
数据辅助
carrier synchronization
frequency offset estimation
large frequency offset
lowSNR
data aid
