高性能单频信号载波频偏估计算法

High-performance carrier frequency offset estimator for single-frequency signal

针对单频信号,提出一种基于数据辅助的高性能载波频偏估计算法。利用m序列对引导码进行扩频解扩,降低信号的噪声功率,提高频偏估计信号的信噪比增益,通过采用一种新的迭代方法,快速准确地获取频偏估计值。仿真结果表明,相比于文献[3,4,7]中的频偏估计算法,该算法估计方差小、估计精度高、估计范围宽,且复杂度低,具有很好的性能。

Aiming at the single-frequency signal, a high-performance nondataaided carrier frequency offset estimator was proposed. The algorithm extended spectrum of the boot code by using the msequence to reduce the noise power and to improve the signal-to-noise ratio of the frequency offset estimation signal, then the carrier frequency offset estimation was extracted with high accuracy by using a new iterative method. Numerical simulations indicate the proposed algorithm performs better than the other methods mentioned in reference [3, 4, 7] which has smaller variance, higher accuracy, wider estimation and lower complexity.