基于二阶循环累积量的载波频率估计

摘要

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.该方法通过检测信号二阶循环累积量的峰值进行载波频率估计,不需要对信号进行分离,可以直接估计双信号的载波频率.仿真结果表明,对于BPSK、QPSK、8QAM、16QAM任意组合的时频重叠双信号,在信噪比不低于-5dB的情况下,该方法的载波频率估计准确率高于95％.%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. Carrier frequency estimate can be implemented by detecting the peak of the specific cycle cumulants. This method doesn't need to separate the signals, can estimate the carrier frequency of the two-signal directly. For any combination of BPSK, QPSK, 8QAM, 16QAM modulation, simulation result shows the accuracy of carrier frequency estimation is greater than 95% when Signal to Noise Ratio(SNR) isn't less than -5 dB.