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Joint effect of artificial noise and primary interference on security performance of cognitive radio networks

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Abstract

Underlay mechanism allows concurrent communications of primary users and secondary users in cognitive radio networks (CRNs), causing mutual interference between them. However, current literature neglects primary interference or considers it as Gaussian noise. In addition, artificial noise, which is intentionally generated to interfere eavesdroppers, can improve security performance of CRNs. This paper analyzes security performance of CRNs, accounting for artificial noise and considering primary interference as non-Gaussian noise, under maximum transmit power constraint, interference power constraint, and Rayleigh fading channels. The security performance is evaluated through proposed exact expressions of secrecy outage probability, non-zero achievable secrecy rate probability, and intercept probability, which are verified by Monte-Carlo simulations. Various results demonstrate that CRNs suffer security performance saturation in the range of large maximum transmit power or large maximum interference power, and primary interference significantly deteriorates security performance while artificial noise is useful in enhancing this performance.

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Notes

  1. \(h_{tr} \sim \mathcal {CN}(0,\lambda _{tr})\) denotes a circular symmetric complex Gaussian random variable (CSCGRV) \(h_{tr}\) with zero mean and variance \(\lambda _{tr}\).

  2. This can be alternatively interpreted that artificial noise is transmitted in the null space to D or shared with D (e.g., use the seed of the artificial noise generator in a secure manner). Such interpretations are widely accepted in open literature (e.g., [10,11,12,13, 15, 20,21,22] and references therein).

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Acknowledgements

This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number 102.04-2017.01

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Authors and Affiliations

  1. The Telecommunications Engineering Department, Ho Chi Minh City University of Technology, 268 Ly Thuong Kiet Str., District 10, HoChiMinh City, Vietnam

    Khuong Ho-Van & Thiem Do-Dac

  2. Thu Dau Mot University, 6 Tran Van On Str., Phu Hoa Ward, Thu Dau Mot City, Binh Duong Province, Vietnam

    Thiem Do-Dac

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  1. Khuong Ho-Van
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  2. Thiem Do-Dac
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Correspondence to Khuong Ho-Van.

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Ho-Van, K., Do-Dac, T. Joint effect of artificial noise and primary interference on security performance of cognitive radio networks. Telecommun Syst 68, 593–603 (2018). https://doi.org/10.1007/s11235-017-0381-5

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  • DOI: https://doi.org/10.1007/s11235-017-0381-5

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