关键词: 星座图, 调制识别, 通过对象排序识别聚类结构（OPTICS）, 聚类有效性分析

Abstract: A novel modulation recognition method is proposed.With the ability of modified OPTICS to find the distribution of database accurately，the presented clustering algorithm overcomes the shortage that the C-means clustering algorithm is sensitive to initial clustering center and sample input order.It can also find out all the meaningful clusters for datasets with varied densities.It determines the number of clusters adaptively via validity analysis.This method is applied to modulation recognition of MPSK/MAPSK signals and experiments show that the recognition method is effective．

Key words: constellation, modulation identification, Ordering Points To Identify the Clustering Structure（OPTICS）, cluster-validity analysis