一种基于循环平稳的MPSK信号调制分类改进算法

An improved algorithm for modulation classification of MPSK signals based on cyclostationary

给出了一种基于循环平稳的MPSK信号调制分类改进算法。通过对预处理后的MPSK信号进行循环平稳分析,把利用高阶累积量对复基带MPSK信号的调制分类推广到已调信号。这种在高阶循环累积量域构成的分类特征不变量具有良好的抗平稳噪声的能力。通过利用二阶循环累量对码元速率的估计,大大减少了累积量估计的运算量。仿真表明,改进后的算法运算精度与原算法大致相当,运算量大大减少。

In this paper, an improved algorithm is proposed for modulation classification of MPSK signals. First the cyclostationary of pretreated signals is analyzed. Then, the modulation classification algorithm of baseband signals is extended to band signals. This feature of cyclic higher-order eumulant can be used to structure invarlants of classifier and can depress Gaussian noise. Through the symbol rate estimation based on the second order cyclostationary, the calculation complexity is reduced highly. Simulation result shows that the classification aeeuraey of improved method comparative to the original method, but the speed is much quicker.