Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-8742
Main Title: Artificial Noise-Aided Physical Layer Security in Underlay Cognitive Massive MIMO Systems with Pilot Contamination
Author(s): Al-Hraishawi, Hayder
Baduge, Gayan Amarasuriya Aruma
Schaefer, Rafael F.
Type: Article
Language Code: en
Abstract: In this paper, a secure communication model for cognitive multi-user massive multiple-input multiple-output (MIMO) systems with underlay spectrum sharing is investigated. A secondary (cognitive) multi-user massive MIMO system is operated by using underlay spectrum sharing within a primary (licensed) multi-user massive MIMO system. A passive multi-antenna eavesdropper is assumed to be eavesdropping upon either the primary or secondary confidential transmissions. To this end, a physical layer security strategy is provisioned for the primary and secondary transmissions via artificial noise (AN) generation at the primary base-station (PBS) and zero-forcing precoders. Specifically, the precoders are constructed by using the channel estimates with pilot contamination. In order to degrade the interception of confidential transmissions at the eavesdropper, the AN sequences are transmitted at the PBS by exploiting the excess degrees-of-freedom offered by its massive antenna array and by using random AN shaping matrices. The channel estimates at the PBS and secondary base-station (SBS) are obtained by using non-orthogonal pilot sequences transmitted by the primary user nodes (PUs) and secondary user nodes (SUs), respectively. Hence, these channel estimates are affected by intra-cell pilot contamination. In this context, the detrimental effects of intra-cell pilot contamination and channel estimation errors for physical layer secure communication are investigated. For this system set-up, the average and asymptotic achievable secrecy rate expressions are derived in closed-form. Specifically, these performance metrics are studied for imperfect channel state information (CSI) and for perfect CSI, and thereby, the secrecy rate degradation due to inaccurate channel knowledge and intra-cell pilot contamination is quantified. Our analysis reveals that a physical layer secure communication can be provisioned for both primary and secondary massive MIMO systems even with the channel estimation errors and pilot contamination.
URI: https://depositonce.tu-berlin.de/handle/11303/9702
http://dx.doi.org/10.14279/depositonce-8742
Issue Date: 10-Jul-2017
Date Available: 2-Aug-2019
DDC Class: 003 Systeme
Subject(s): massive MIMO
pilot contamination
cognitive radio
physical layer security
artificial noise
License: https://creativecommons.org/licenses/by/4.0/
Journal Title: Entropy
Publisher: MDPI
Publisher Place: Basel
Volume: 19
Issue: 7
Article Number: 349
Publisher DOI: 10.3390/e19070349
EISSN: 1099-4300
Appears in Collections:FG Theoretische Grundlagen der Kommunikationstechnik » Publications

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