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High Order Multi-User MIMO Subspace Detection

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Abstract

An efficient high order multi-user multiple-input multiple-output (MU-MIMO) subspace detector is proposed. The detector employs joint modulation classification (MC) and subspace detection (SD), by which the modulation type of the interferer is estimated, while multiple decoupled streams are individually detected. The algorithmic contributions are on two levels. First, the preprocessing channel matrix decomposition overhead is reduced, using special layer ordering followed by permutation-robust QR Decomposition and elementary matrix operations. Second, a hierarchical MC scheme is proposed, comprising feature-based and near-optimal likelihood-based classifiers, as well as a classifier that always assumes the interfering modulation type to be a fixed high order quadrature amplitude modulation. An efficient hardware architecture that realizes the proposed algorithms is presented. Simulations demonstrate that depending on the channel condition, one of the proposed schemes can achieve near interference-aware performance with a minimum complexity overhead.

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Acknowledgments

This work was partially funded by the National Council for Scientific Research (CNRS) in Lebanon.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, American University of Beirut, Beirut, 1107 2020, Lebanon

    Hadi Sarieddeen, Mohammad M. Mansour & Ali Chehab

  2. Qualcomm Incorporated, San Diego, CA, USA

    Louay Jalloul

Authors
  1. Hadi Sarieddeen
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  2. Mohammad M. Mansour
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  3. Louay Jalloul
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  4. Ali Chehab
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Corresponding author

Correspondence to Hadi Sarieddeen.

Additional information

Early results of this paper were presented at the IEEE Wireless Communication and Networking Conference (WCNC 2016), Doha, Qatar, April 2016. [41].

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Sarieddeen, H., Mansour, M.M., Jalloul, L. et al. High Order Multi-User MIMO Subspace Detection. J Sign Process Syst 90, 305–321 (2018). https://doi.org/10.1007/s11265-017-1231-0

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  • DOI: https://doi.org/10.1007/s11265-017-1231-0

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