关键词: 峭度, 约束独立成分分析, 固定点算法

Abstract: One-unit ICA-R is an efficient method utilizing prior information to extract an expected source signal.Aimed at flaw of the fast algorithm based on kurtosis，it performs theoretical analysis on the fast algorithm under two common closeness measurements，points out the reason of lower accurate extraction rate.It proposes a fixed-point algorithm through removing invalidation of inequality constraints based on new CICA.Computer simulations verify that the fixed-point algorithm can converge faster and extract more accurately with almost same extraction performance of the fast algorithm.

Key words: kurtosis, Constrained Independent Component Analysis（CICA）, fixed-point algorithm