A Novel Method for Complex-Valued Signals in Independent Component Analysis Framework

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• 作者：Wei Zhao ; Yuehong Shen ; Zhigang Yuan ; Dawei Liu&#8230
• 关键词：Independent component analysis ; Reference ; based contrast criteria ; Kurtosis ; Negentropy ; FastICA
• 刊名：Circuits, Systems, and Signal Processing
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：34
• 期：6
• 页码：1893-1913
• 全文大小：2,329 KB
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  17. http://鈥媤ww.鈥媓ome.鈥媋gilent.鈥媍om
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• 作者单位：Wei Zhao (1)
  Yuehong Shen (1)
  Zhigang Yuan (1)
  Dawei Liu (2)
  Pengcheng Xu (1)
  Yimin Wei (1)
  Wei Jian (1)
  Nan Sha (1)
  
  1. College of Communications Engineering of PLA University of Science and Technology, Houbiaoying Road No.88, Qinhuai District, Nanjing, 210014, People鈥檚 Republic of China
  2. Chongqing Communications Institute, Chongqing, 400035, People鈥檚 Republic of China
  
• 刊物类别：Engineering
• 刊物主题：Electronic and Computer Engineering
  
• 出版者：Birkh盲user Boston
• ISSN：1531-5878

文摘

This paper deals with the separation problem of complex-valued signals in the independent component analysis (ICA) framework, where sources are linearly and instantaneously mixed. Inspired by the recently proposed reference-based contrast criteria based on kurtosis, a new contrast function is put forward by introducing the reference-based scheme to negentropy, based on which a novel fast fixed-point (FastICA) algorithm is proposed. This method is similar in spirit to the classical negentropy-based FastICA algorithm, but differs in the fact that it is much more efficient than the latter in terms of computational speed, which is significantly striking with large number of samples. Furthermore, compared with the kurtosis-based FastICA algorithms, this method is more robust against unexpected outliers, which is particularly obvious when the sample size is small. The local consistent property of this new negentropic contrast function is analyzed in detail, together with the derivation of this novel algorithm presented. Performance analysis and comparison are investigated through computer simulations and realistic experiments, for which a simple wireless communication system with two transmitting and receiving antennas is constructed.