Separation of Mixtures of Complex Sinusoidal Signals with Independent Component Analysis

Tetsuo KIRIMOTO  Takeshi AMISHIMA  Atsushi OKAMURA  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.1   pp.215-221
Publication Date: 2011/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.215
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
independent component analysis,  fourth cumulant,  complex sinusoidal signals,  separation performance,  radar,  communication,  

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ICA (Independent Component Analysis) has a remarkable capability of separating mixtures of stochastic random signals. However, we often face problems of separating mixtures of deterministic signals, especially sinusoidal signals, in some applications such as radar systems and communication systems. One may ask if ICA is effective for deterministic signals. In this paper, we analyze the basic performance of ICA in separating mixtures of complex sinusoidal signals, which utilizes the fourth order cumulant as a criterion of independency of signals. We theoretically show that ICA can separate mixtures of deterministic sinusoidal signals. Then, we conduct computer simulations and radio experiments with a linear array antenna to confirm the theoretical result. We will show that ICA is successful in separating mixtures of sinusoidal signals with frequency difference less than FFT resolution and with DOA (Direction of Arrival) difference less than Rayleigh criterion.