【摘要】 传统随机信号处理都假设所要处理的信号为平稳信号,然而实际中所遇到的信号却不一定能满足这一前提条件,即信号不具有平稳性,而是非平稳性信号,循环平稳信号就是一类较为重要的非平稳信号,文中介绍了循环平稳信号的定义性质,研究了QPSK这一类调制信号的循环平稳性,提出了一种利用循环统计量对这一类信号进行检测的方法,并进行了仿真实验.仿真表明,循环统计量具有很强的噪声抑制能力.更多还原

【Abstract】 The signal is assumed to be stationary in the conventional signalprocessing field. But,the signal to be processed often is not of stationary characteristics,namely the signal is a nonstationary signal,and cyclostationary signal is an important class of unstationary signals. The concept and important properties of this class of signals were briefly discussed,and the central role of spectral correlation of QPSK signal was researched. The spectral correlation characteristics of QPSK signal was simulated in Matlab to illustrate the difference between spectral correlation characteristics and power spectral density.更多还原