CAJ | 학술논문

针对Alpha稳定噪声下时频重叠信号载波频率估计困难的问题，该文提出一种Alpha稳定噪声下时频重叠信号的载波频率估计方法。该方法首先提出时频重叠信号的广义四阶循环累积量的定义，然后检测离散谱线所对应的广义四阶循环累积量幅度谱的循环频率，进而估计出各个信号分量的载波频率，最后进行渐近性的理论分析，证明了该估计方法是渐近无偏和一致的。仿真结果表明，在 Alpha 稳定分布噪声下，该方法具有良好的估计性能和稳健性。
침대Alpha은정조성하시빈중첩신호재파빈솔고계곤난적문제，해문제출일충Alpha은정조성하시빈중첩신호적재파빈솔고계방법。해방법수선제출시빈중첩신호적엄의사계순배루적량적정의，연후검측리산보선소대응적엄의사계순배루적량폭도보적순배빈솔，진이고계출각개신호분량적재파빈솔，최후진행점근성적이론분석，증명료해고계방법시점근무편화일치적。방진결과표명，재 Alpha 은정분포조성하，해방법구유량호적고계성능화은건성。
In order to solve the issue that carrier frequency estimation of time-frequency overlapped signals is difficult in Alpha-stable distribution noise environment, a novel carrier frequency estimation method of the time-frequency overlapped signals is proposed. First the definition of Generalized Fourth-Order Cyclic Cumulant (GFOCC) of the time-frequency overlapped signals is proposed. Then the carrier frequency of each signal component is estimated by detecting the cycle frequency of the amplitude spectrum of GFOCC, which is corresponding to discrete spectra line. Finally, the theoretical asymptotic analysis demonstrates that this estimation method is asymptotically unbiased and consistent. Simulation results show that the proposed method achieves good estimation performance and robustness in Alpha-stable distribution noise environment.