一种非判决辅助前向结构载波频差估计方法

Non-Decision-Aided Feedforward Carrier Frequency Offset Estimator

本文从最大似然准则出发 ,提出一种适于旋转对称星座的非判决辅助前向结构载频偏差估计算法 .为了解决相位区间跳变问题 ,从而扩大估计范围 ,提出了一种新的相位展开方法 .对于 2π/M旋转对称星座 ,该估计算法的估计范围可扩大到± 1/ 2MT .计算机仿真给出了该算法在估计范围、估计精度以及计算复杂度方面的性能 .

We propose a non-decision-aided feedforward carrier frequency offset estimator for rotationally symmetric constellation. It is derived from the maximum likelihood (ML) principle. In order to solve the problem of phase wrapping and extend the estimation range, a new phase unwrapping algorithm is proposed. For 2π/M rotation symmetric constellation, the estimation range can be extended to ± 1/2MT. Computer simulation results demonstrate the estimation range, estimation precision and complexity of the estimator.