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A joint random weighting method for physical layer security in wireless relay system

Suxia Guo, Xinsheng Ji, Keming Ma, Ming Yi

Published Oct 1, 2014• 0 citations
Publisher

Abstract

In the wireless cooperative relay system, the private information can be intercepted by the untrusted relays. The traditional method of artificial noise based on physical layer security consumed much more power to protect the security of private information. To solve this problem, this paper combines amplify-and-forward coefficient of the relays with the joint channel state information (JCSI), and constructs the joint channel between the sender and the receiver. According to the joint channel characteristics the sender designs randomized weighting vector for its antenna, which is constant by multiplied with the joint channel characteristics. This method can make the equivalent channel be constant between the sender and the legitimate receiver while the equivalent channels change fast between the sender and the relays. Simulation results show that the bit error rate (BER) of Relays is almost 0.5 constantly and the BER of receiver is 10-3simultaneously when the received SNR is 10dB. Compared with the method based on artificial noise, 1.6dB power can be saved in the proposed method.

DOI
10.1109/icosp.2014.7015261

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In the wireless cooperative relay system, the private information can be intercepted by the untrusted relays. The traditional method of artificial noise based on physical layer security consumed much more power to protect the security of private information. To solve this problem, this paper combines amplify-and-forward coefficient of the relays with the joint channel state information (JCSI), and constructs the joint channel between the sender and the receiver. According to the joint channel characteristics the sender designs randomized weighting vector for its antenna, which is constant by multiplied with the joint channel characteristics. This method can make the equivalent channel be constant between the sender and the legitimate receiver while the equivalent channels change fast between the sender and the relays. Simulation results show that the bit error rate (BER) of Relays is almost 0.5 constantly and the BER of receiver is 10-3simultaneously when the received SNR is 10dB. Compared with the method based on artificial noise, 1.6dB power can be saved in the proposed method.
To solve the problem of untrusted relays, we propose a physical layer security transmission mechanism in relay system. We get the joint channel characteristics by combining the two channels, source node to relay and relay to destination node, into one. Based on this, we construct artificial noise and add it to the transmission signal, in order to make the internal and external wire-tappers get none of the information. The optimal signal transmission power is calculated subsequently. Simulation results show that when the artificial noise lies in the null space of the legitimate receiver's channel, secrecy capacity of the cooperative relay system can be improved and the bit-error rate of the legitimate receiver is much smaller than wire-tappers.
In this paper, we investigate physical layer security for simultaneous wireless information and power transfer in amplify-and-forward relay networks. We propose a joint robust cooperative beamforming and artificial noise scheme for secure communication and efficient wireless energy transfer. Specifically, by treating the energy receiver as a potential eavesdropper and assuming that only imperfect channel state information can be obtained, we formulate an optimization problem to maximize the worst-case secrecy rate between the source and the legitimate information receiver under both the power constraint at the relays and the wireless power harvest constraint at the energy receiver. Since such a problem is non-convex and hard to tackle, we propose a two-level optimization approach which involves a one-dimensional search and semidefinite relaxation. Simulation results show that the proposed robust scheme achieves better worst-case secrecy rate performance than other schemes.
In the physical layer security (PLS), the beam forming with multiple antennas enhances the received signal power at the legitimate user but suppresses it at the other users. The other users hardly demodulate the information without the bit error. However, if the channel state between the legitimate user and the other one is highly correlated, it is possible for the other users to demodulate the information signal. This paper proposes the novel secure communication system with utilizing the artificial noise and the relay station. When the legitimate user emits the artificial noise, the relay station receives the information bearing signal and the artificial noise. The other users cannot demodulate the information due to the interference of artificial noise. After the relay forwards the combined signal between the information bearing signal and the artificial noise to the legitimate user, the artificial noise is removed from the forwarded signal by the legitimate user. As a result, the legitimate user can demodulate the information. Therefore, the secure wireless communication can be constructed. This paper evaluates the secure capacity for the various location of eavesdropper and clarifies the validity of proposed system.
In this letter, we consider a cooperation system with multiple untrusted relays (URs). To keep the transmitted information confidential, we obtain joint channel characteristics (JCCs) through combining the channels from the source to the destination. Then, in the null space of the JCCs, jammers construct artificial noise to confuse URs when the source node broadcasts its data. Through a distributed implementation algorithm, the weight of each node can be obtained from its own channel state information. Simulation results show that high-level security of the system can be achieved when internal and external eavesdroppers coexist.
This paper investigates the problem of joint design of cooperative beamforming and artificial noise to achieve robust secure transmission in an amplify and forward (AF) relay network in the presence of multiple eavesdroppers. Specifically, the joint design is targeting to minimize the total relay transmission power while guaranteeing the quality of service at the legitimate receiver and preventing the eavesdroppers from interception. Different from prior designs, direct links between the source and the legitimate receiver/eavesdroppers are considered and no perfect channel state information is assumed. Considering bounded channel uncertainties in all links, the worst cases of the total relay transmission power, quality of service (i.e., the received signal-to-noise ratio) and security are first identified. Then an iterative algorithm is proposed to jointly design the relay beamforming and artificial noises for robust secure transmission. It is demonstrated by computer simulations that the proposed robust secure design is effective and practical when compared with the prior designs.
Securing the wireless transmissions in the physical layer is a new perspective of security. In a wireless relay system, cooperative beamforming and jamming are two efficient schemes to improve the physical-layer security in the presence of passive eavesdroppers. However, in most works these two techniques are used in phase II of the cooperative transmission, which leaves the phase I out of protection. In this paper, we propose a joint cooperative beamforming and jamming scheme to enhance the security of a cooperative relay network, where a part of intermediate nodes adopt distributed beamforming while others jam the eavesdropper, simultaneously, such that both phases are secured. Since the instantaneous channel state information (CSI) of the eavesdropper may not be known, we propose a cooperative artificial noise transmission based secrecy strategy, subjected to the individual power constraint of each node. The beamformer weights and power allocation can be obtained by solving a second-order convex cone programming (SOCP) together with a linear programming problem. Simulations show the joint scheme greatly improves the security.