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SLNR-Based Transmit Beamforming for MIMO Wiretap Channel

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Abstract

In this paper, a novel closed-form transmit beamforming scheme is proposed for multiple-input multiple-output (MIMO) wiretap channel. The proposed method follows the idea of maximizing signal-to-leakage-plus-noise ratio and does not need additional power allocation. An efficient approach is further developed to implement the generalized eigenvalue decomposition required by our method when n r  < n t (n t , n r and n e denote the antenna numbers at the transmitter, the intended receiver and the eavesdropper, respectively), which has lower complexity than the existing approaches. Moreover, we identify some shortcomings of the generalized singular value decomposition (GSVD) based beamforming method, a common beamforming scheme for MIMO wiretap channel. Finally, simulation results show that the proposed method significantly outperforms GSVD-based method when n e  < n t and has almost the same performance as GSVD-based method when n e  ≥ n t .

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Authors and Affiliations

  1. Tsinghua National Laboratory for Information Science and Technology, Department of Automation, Tsinghua University, Beijing, 100084, China

    Kun Wang, Xiyuan Wang & Xianda Zhang

Authors
  1. Kun Wang
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  2. Xiyuan Wang
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  3. Xianda Zhang
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Correspondence to Kun Wang.

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Wang, K., Wang, X. & Zhang, X. SLNR-Based Transmit Beamforming for MIMO Wiretap Channel. Wireless Pers Commun 71, 109–121 (2013). https://doi.org/10.1007/s11277-012-0798-9

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  • DOI: https://doi.org/10.1007/s11277-012-0798-9

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