关键词: 功率谱估计, 载频估计, 恶劣信道, 频率居中法

Abstract: Signal carrier frequency estimation is an important issue in the areas of signal processing about communications, radar, sonar and electronic countermeasures. According to the theory of carrier frequency estimation—frequency mediacy, a new algorithm of blind carrier frequency estimation is proposed which combined with Welch power spectrum computation. The new algorithm can estimate carrier frequency effectively without modulation and timing information of signal, and the performance of this algorithm is better than the frequency mediacy in low Signal to Noise Ratio （SNR）. Even under the condition of  wicked channel, the algorithm can achieve a more precise estimate, so the algorithm has a good prospect in the short-wave communications.

Key words: power spectrum estimation, carrier frequency estimation, wicked channel, frequency mediacy