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International Conference on Internet of Things, Embedded Systems and Communications (IINTEC)

Physical Layer Security of Full-Duplex Cognitive Radio Network Using Beamforming

Nibedita Nandan, Sudhan Majhi

Published Dec 1, 2019• 1 citation
Publisher

Abstract

Recently, combination of full-duplex (FD) technology with existing wireless devices are gaining much interest due to their spectrum efficient usage. In this work, a cognitive radio network (CRN) with FD relay for secondary user (SU) is proposed and physical layer security (PLS) issue is analyzed in the presence of passive eavesdropper by using maximum ratio transmission (MRT) and zero forcing beamforming (ZFBF) techniques. The restriction of self interference at FD relay is cancelled by using ZFBF technique when the number of transmit antenna at relay is greater than the number of receive antenna; on the other hand, null space projection (NSP) is applied for the reverse scenario. For information sharing, both ZFBF and MRT techniques are used. The FD relay is used for generating artificial noise (AN) to degrade the received signal-to-noise ratio (SNR) of the eavesdroppers while simultaneously receive data from secondary transmitter. The ergodic physical layer secrecy capacity and physical layer secrecy outage of both primary user (PU) and SU are evaluated. Finally, Monte-Carlo simulation is performed to compare the proposed approach with other existing techniques.

DOI
10.1109/iintec48298.2019.9112103

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Recently, combination of full-duplex (FD) technology with existing wireless devices are gaining much interest due to their spectrum efficient usage. In this work, a cognitive radio network (CRN) with FD relay for secondary user (SU) is proposed and physical layer security (PLS) issue is analyzed in the presence of passive eavesdropper by using maximum ratio transmission (MRT) and zero forcing beamforming (ZFBF) techniques. The restriction of self interference at FD relay is cancelled by using ZFBF technique when the number of transmit antenna at relay is greater than the number of receive antenna; on the other hand, null space projection (NSP) is applied for the reverse scenario. For information sharing, both ZFBF and MRT techniques are used. The FD relay is used for generating artificial noise (AN) to degrade the received signal-to-noise ratio (SNR) of the eavesdroppers while simultaneously receive data from secondary transmitter. The ergodic physical layer secrecy capacity and physical layer secrecy outage of both primary user (PU) and SU are evaluated. Finally, Monte-Carlo simulation is performed to compare the proposed approach with other existing techniques.
This paper studies the secure transmission in cognitive wiretap relaying networks with full-duplex technique over Rayleigh channels, where a secondary user (SU) transmitter (Alice) aims to transmit confidential information to a multi-antenna legitimate SU receiver (Bob) in the presence of a multi-antenna relay (Relay), a primary user (PU) and a passive eavesdropper (Eve). For secrecy performance enhancement, we propose maximal-ratio combining-zero forcing beamforming/maximal-ratio transmission-selection combining-zero forcing beamforming (MRC-ZFB/MRT-SC-ZFB) scheme. The closed-form expression for the secrecy outage probability (SOP) of the CRNs with MRC-ZFB/MRT-SC-ZFB scheme is derived. From the analysis, we look into the high signal-to-noise ratio (SNR) regime, and present simple secrecy outage approximation for the proposed scheme, which reveals that the secrecy diversity order is min (NR, NRNB), where NRand NBare the number of antennas at Relay and Bob, respectively.
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In this study, the physical layer security for cognitive radio network (CRN) will be investigated in which a secondary user transmitter (SU-Tx) sends confidential information to a SU receiver (SU-Rx) on the same frequency band of a primary user (PU) in the presence of an eavesdropper receiver. Moreover, relay selection scheme is proposed for the security constrained CRNs with single eavesdropper, multiple eavesdroppers and PUs. The proposed scheme selects a trusted decode and forward relay to assist the SU-Tx and maximise the achievable secrecy rate that is subjected to the interference power constraints at the PUs for the different number of eavesdroppers and PUs under available channel knowledge. The SU cooperates with relays only when a high secrecy rate is achieved. Secrecy rate and secrecy outage probability are the two performance metrics that are used to verify the effectiveness of the proposed scheme although asymptotic approximations of the secrecy outage probability are also derived. Simulation and analytical results demonstrate that the performance improvement of the proposed scheme reaches to the double relative to the conventional scheme for the secrecy capacity.
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