基于MPSK信号的实用高精度的载频盲估计研究

在现代电子信息中,精确的载频估计是接收信息正确解调的基础。基于MPSK调制信号提出一种实用性、高精度的载频盲估计新算法。利用自相关函数的原理,把谱相关的计算量降到了一般的数字电路可以实现的程度,并且在低信噪比的情况下估计结果优良;通过粗估计和精估计两次运算来提高载频的盲估计精度。经过理论分析和MATLAB仿真验证说明本算法的正确性和可行性。

A Carrier Frequency Blind Estimation Algorithm of Practicality and High Precision Based on MPSK Modulation Signal

In the modern electronic information, the precision of carrier frequency estimation is the basis of the correct demodulation receiving information. In this paper, we propose a carrier frequency blind estimation algorithm of practicality and high precision based on MPSK modulation signal. According to the principle of autocorrelation function, we can put the calculation of spectral correlation down to the level of realization, and the estimation result is excellent in the case of low SNR. A new blind MPSK carrier frequency estimation method is proposed, and then, through the rough estimate and fine estimate to improve the blind estimation precision of carrier frequency. The correctness and feasibility of the algorithm are proved through theoretical analysis and Matlab simulation.