针对单信道中时频重叠双信号的载波频率估计问题，提出一种基于二阶循环累积量的载波频率估计方法。

Aiming at time-frequency overlapped two-signals in single-channel, this paper proposed a method to estimate carrier frequency based on second-order cyclic cumulants.

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针对未知调制类型情况下数字调制信号的载波频率估计问题，提出了一种适用于数字调制信号的载波频率估计方法。

To estimate carrier frequency of digitally modulated signal whose modulation type is unknown, a carrier frequency estimation method for digitally modulated signal is proposed.

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本文根据OFDM系统特点，分析了OFDM系统的时域载波频率捕获和信道估计方法。

We propose new carrier frequency acquisition and channel estimation algorithms based on the time-domain analysis of OFDM system.

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