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Multidimensional Blind Separation Using Higher-Order Statistics: Application to Non-Cooperative STBC Systems

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Abstract

Blindly separating the intercepted signals is a challenging problem in non-cooperative multiple input multiple output systems in association with space–time block code (STBC) where channel state information and coding matrix are unavailable. To our knowledge, there is no report on dealing with this problem in literature. In this paper, the STBC systems are represented with an independent component analysis (ICA) model by merging the channel and coding matrices as virtual channel matrix. Analysis shows that the source signals are of group-wise independence and the condition of mutual independence can not be satisfied for ordinary ICA algorithms when specific modulations are employed. A new multidimensional ICA algorithm is proposed to separate the intercepted signals in this case by jointly block-diagonalizing (JBD) the cumulant matrices. In this paper, JBD is achieved by a 2-step optimization algorithm and a contrast function is derived from the JBD criterion to remove the additional permutation ambiguity with explicit mathematical explanations. The convergence of the new method is guaranteed. Compared with the ICA-based channel estimation methods, simulations show that the new algorithm, which does not introduce additional ambiguities, achieves better performance with faster convergence in a non-cooperative scenario.

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Authors and Affiliations

  1. School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu,  611731, China

    Minggang Luo, Liping Li, Guobing Qian & Hongshu Liao

  2. School of Mathematics and Computer Science, Panzhihua University, Panzhihua,  617000, China

    Minggang Luo

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  1. Minggang Luo
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Correspondence to Minggang Luo.

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Luo, M., Li, L., Qian, G. et al. Multidimensional Blind Separation Using Higher-Order Statistics: Application to Non-Cooperative STBC Systems. Circuits Syst Signal Process 33, 2173–2192 (2014). https://doi.org/10.1007/s00034-014-9738-0

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  • DOI: https://doi.org/10.1007/s00034-014-9738-0

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