分数倍采样对幅相调制信号累积量的影响

Effects of Fractional Sampling on Cumulants of Amplitude-Phase Modulations

幅相调制信号的累积量分析要求最佳采样,本文通过对分数倍采样复基带序列累积量的理论分析,讨论了采样速率和基带成形脉冲函数对幅相调制信号累积量的影响,认为分数倍采样序列的累积量能够收敛于最佳采样序列的累积量理论值,并由此得出结论认为,现有基于累积量的幅相调制信号同步分类算法可以直接应用于异步条件。最后,通过MPSK信号的分类实验验证了理论分析的正确性。

As cumulant analysis for amplitude-phase modulations requires symbol-rate-sampling,theoretical analysis for cumulants of fractional sampled base-band signal is taken in this paper,considering the effects of over-sampling rate and base-band pulse-shaping function, and concludes that cumulants of fractional sampled signals would converge to those of the symbol-rate sampled ones. This conclusion helps directly applying the cumulant based synchronous classification algorithm to fractional sampled modulations. Experiments for MPSK classification give consistent results with theoretical analysis.