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Secrecy Enhancing in Wireless Communication with a Full-Duplexing at the Receiver

Lukman Abiodun Olawoyin, Yue Wu, Hongwen Yang, Bala Alhaji Salihu, Munzali Ahmed Abana

Published Dec 1, 2015• 3 citations
Publisher

Abstract

Information secrecy is achievable in a broadcast wireless communication system when the adversary channel witness a greater disruption as against the main channel. The secrecy level need to be enhanced as the adversary terminal can use advance method to eaves drop the hidden message being exchanged between the two legitimate communicating partners. The use of relay- assisted node in information-theoretic approach at the physical layer security has been widely researched into but they are mostly operate in a half-duplex mode (HD). With the advancement in electronic technology, the use of a single antenna in full duplex mode (FD) is possible. We explore this property in enhancing the security of a broadcast wireless system at the physical layer. In this work, the transmitter generates artificial noise (AN) while the legitimate receiver(LR) also transmits another jamming noise (JN) from its antenna to unintended receiver (UR) node. The effect of these multiple noises are examined on the secrecy capacity and probability outage capacity on the UR channel. Mathematical analysis and the numerical simulation results show improvement in channel secrecy capacity over the conventional approaches.

DOI
10.1109/glocom.2015.7417880

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Information secrecy is achievable in a broadcast wireless communication system when the adversary channel witness a greater disruption as against the main channel. The secrecy level need to be enhanced as the adversary terminal can use advance method to eaves drop the hidden message being exchanged between the two legitimate communicating partners. The use of relay- assisted node in information-theoretic approach at the physical layer security has been widely researched into but they are mostly operate in a half-duplex mode (HD). With the advancement in electronic technology, the use of a single antenna in full duplex mode (FD) is possible. We explore this property in enhancing the security of a broadcast wireless system at the physical layer. In this work, the transmitter generates artificial noise (AN) while the legitimate receiver(LR) also transmits another jamming noise (JN) from its antenna to unintended receiver (UR) node. The effect of these multiple noises are examined on the secrecy capacity and probability outage capacity on the UR channel. Mathematical analysis and the numerical simulation results show improvement in channel secrecy capacity over the conventional approaches.
Information secrecy is achievable in a broadcast wireless communication system when the adversary channel witness a greater disruption as against the main channel. The secrecy level need to be enhanced as the adversary terminal can use advance method to eaves drop the hidden message being exchanged between the two legitimate communicating partners. The use of relay- assisted node in information-theoretic approach at the physical layer security has been widely researched into but they are mostly operate in a half-duplex mode (HD). With the advancement in electronic technology, the use of a single antenna in full duplex mode (FD) is possible. We explore this property in enhancing the security of a broadcast wireless system at the physical layer. In this work, the transmitter generates artificial noise (AN) while the legitimate receiver(LR) also transmits another jamming noise (JN) from its antenna to unintended receiver (UR) node. The effect of these multiple noises are examined on the secrecy capacity and probability outage capacity on the UR channel. Mathematical analysis and the numerical simulation results show improvement in channel secrecy capacity over the conventional approaches.
This paper considers the effect of an end-user assisted jamming scheme to achieve a secure transmission of information over Nakagami-m fading channel in wireless broadcast system. In this work, full duplex (FD) antenna at the legitimate receiver (LR) was introduced in a way that the LR will contribute additional noise to the system to degrade the eavesdropper's channel. The approach achieves secured transmission with improved secrecy when compared to the conventional method that artificial noise (AN) scheme is transmitted from the transmitter only. Numerical analysis and simulation results show an improvement in the secrecy performance metrics.
This paper studies secrecy rate optimization in a wireless network with a single-antenna source, a multi-antenna destination and a multi-antenna eavesdropper. This is an unfavorable scenario for secrecy performance as the system is interference-limited. In the literature, assuming that the receiver operates in half duplex (HD) mode, the aforementioned problem has been addressed via use of cooperating nodes who act as jammers to confound the eavesdropper. This paper investigates an alternative solution, which assumes the availability of a full duplex (FD) receiver. In particular, while receiving data, the receiver transmits jamming noise to degrade the eavesdropper channel. The proposed self-protection scheme eliminates the need for external helpers and provides system robustness. For the case in which global channel state information is available, we aim to design the optimal jamming covariance matrix that maximizes the secrecy rate and mitigates loop interference associated with the FD operation. We consider both fixed and optimal linear receiver design at the destination, and show that the optimal jamming covariance matrix is rank-1, and can be found via an efficient 1-D search. For the case in which only statistical information on the eavesdropper channel is available, the optimal power allocation is studied in terms of ergodic and outage secrecy rates. Simulation results verify the analysis and demonstrate substantial performance gain over conventional HD operation at the destination.
Cooperative communication is an emerging method that allows devices with a single antenna to share their antennas and assist other nodes in transmitting signals. This leads to enhanced spatial diversity, lower power consumption, and increased reliability of signal reception. This study uses full-duplex mode and α−μ\alpha-\muα−μ fading channels and derives the secrecy outage probability for a single relay to assess the system’s secrecy performance and examine how utilizing jamming signals affects system security. Theoretical results for the derived expression are given.
Abstract This paper examines physical layer security in a NOMA-based two-way wireless communication system with several decode-and-forward relays and a malicious eavesdropper. We implement a partial relay selection system to maximize the secrecy capacity of a specific user's information signal. Two hops are involved in the communication process because of the half-duplex relay cooperation. A selected relay receives information from two users. The relay strengthens the signals and broadcasts them during the second hop. Additionally, a jammer transmits a jamming signal that is known to all legitimate nodes but appears as noise with the received signals at the eavesdropper. Since legitimate user nodes are already aware of the jamming signal, channel status information, and self-information, they can decode the original information in downlink mode by self-interference and successive interference cancellation. Secrecy outage probability, intercept probability, and secrecy throughput have been investigated as metrics to analyze the security, where the secrecy performance of a particular user is found to increase by 94.66 %94.66\, \%94.66% with an increment in transmit SNR of jamming from 60 dB60\, dB60dB to 70 dB70\, dB70dB and increases by 90.78 %90.78\, \%90.78% with an increment in the number of relays from 2 to 5.
Relaying is a promising technique to improve wireless physical-layer security. Existing literature shows that a full-duplex relay can further improve the secrecy capacity and secrecy outage probability compared to conventional half-duplex relay, but this comes at a price of sophisticated implementation. For sake of easy implementation, two-path successive relaying has been proposed to emulate the full-duplex relay by scheduling a pair of half-duplex relays to assist the source transmission alternately. However, the performance of two-path successive relaying in secrecy communication remains unexplored. This paper proposes a secrecy two-path successive relaying protocol for a scenario with one source, one destination and two half-duplex relays. The relays operate alternately in a time division mode to forward messages continuously from source to destination in the presence of an eavesdropper. To further confuse the eavesdropper, the source and relay are scheduled to transmit jamming signals at appropriate intervals. Analytical results on the secrecy outage probability reveals that the proposed protocol is able to deliver the target secrecy rate when the SNR of the eavesdropping channels are high. In addition, the secrecy outage probability of the proposed protocol is the joint secrecy outage probability of the relay pair. Numerical simulations show that the proposed protocol achieves the highest ergodic secrecy capacity and lowest secrecy outage probability compared to the existing half duplex relaying, full duplex relaying and full duplex jamming schemes.