基于前馈的时频域联合频偏估计算法  

A Feed-forward Frequency Offset Estimation Algorithm Based on Time and Frequency Domain

作　　者：杜锋[1] 李广侠[1] 向中武 唐璟宇 张迅 云飞龙 

机构地区：[1]解放军理工大学通信工程学院 [2]解放军75707部队

出　　处：《电子质量》2016年第5期9-13,21,共6页Electronics Quality

摘　　要：传统的前馈频偏估计算法分为时域算法和频域算法。时域算法主要采用准似然函数法则,借助于卷积或者相关函数求解频偏,其估计精度较高,但受限于Nyquist定定理,其估计范围限定在[-fs/2,fs/2]范围以内,甚至更小。频域估计主要借助于FFT实现,估计范围较大,但是由于FFT无法克服栅栏效应,因此其估计精度受限。该文结合二者有点,提出一种时频域联合频偏估计方法。该算法估计范围与FFT算法相同,同时,当信噪比较低时,其误差接近于CRLB。Traditional feed-forward frequency estimation algorithm is divided into the time domain and frequency domain algorithm.Time Domain algorithms are mainly in the law of likelihood function,by means of a correlation function to solve the offset, the estimated value is in high precision,but limited to a given Nyquist theorem with the scope[-fs/2,fs/2],and even less.Frequency domain estimation is mainly realized by means of FFT,it can be estimated in a large range,but due to the FFT insurmountable barrier effect,the estimation accuracy is limited.The paper combines the time and frequency domain and a new frequency offset estimation method is proposed.The algorithm has the same estimation scope with the FFT.At the same time,when the signal to noise ratio is low,the error is close CRLB.

关 键 词：前馈频偏估计 M&M算法 FFT 时频域联合 

分 类 号：TN911.23[电子电信—通信与信息系统]