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2012 International Conference on Computing, Networking and Communications (ICNC)

Power Allocation Scheme for Physical-Layer Security of Two-Way Untrusted Relay in SCMA networks

Zhiqiang Li, Shuai Han, Xiao Wang

Published Feb 1, 2020• 5 citations
Publisher

Abstract

With the rapid development of electronic technology, secure communication has been widely used in the whole modern telecommunication system, and security has become an important measure of communication quality. With the improvement of communication quality and the increase of communication distance, the secrecy capacity of communication system with relay has been studied extensively. However, in the case of a large number of users, less frequency resources and limited power, there is little research on how to control the power and improve the secrecy capacity as much as possible. In this case, based on the Sparse Code Multiple Access (SCMA) network model, this paper analyses the relationship between the security capacity and the number of users, the power allocation of users and the power allocation of cooperative interference in the two-way uncertain relay system, and gives the power allocation scheme of user-to-user and cooperative interference. The superiority of the power allocation scheme proposed in this paper has been proved by simulation results, and it has great practical value.

DOI
10.1109/icnc47757.2020.9049661

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With the rapid development of electronic technology, secure communication has been widely used in the whole modern telecommunication system, and security has become an important measure of communication quality. With the improvement of communication quality and the increase of communication distance, the secrecy capacity of communication system with relay has been studied extensively. However, in the case of a large number of users, less frequency resources and limited power, there is little research on how to control the power and improve the secrecy capacity as much as possible. In this case, based on the Sparse Code Multiple Access (SCMA) network model, this paper analyses the relationship between the security capacity and the number of users, the power allocation of users and the power allocation of cooperative interference in the two-way uncertain relay system, and gives the power allocation scheme of user-to-user and cooperative interference. The superiority of the power allocation scheme proposed in this paper has been proved by simulation results, and it has great practical value.
The inherent broadcast characteristics of wireless medium make wireless data transmission difficult to be shielded from unintended recipients. As such, secure communication over wireless channels becomes a critical issue in the design of wireless networks. In this study, the authors study cooperative jamming and power optimisation in untrusted relay networks to improve physical layer security. By exploiting the direct link, a source‐based jamming (SBJ) scheme is proposed to hinder the untrusted relay from intercepting the confidential message. Considering the total power budget, a power allocation strategy is also proposed to optimally determine the power of source and untrusted relay as well as the power of information and jamming signals. Furthermore, to evaluate the secrecy performance of the proposed SBJ scheme with the power allocation strategy, tight lower bound of ergodic secrecy capacity and asymptotic secrecy outage probability are derived in closed form. Simulation verifies the advantages of the proposed SBJ scheme and the power allocation strategy.
The secure communication of a two-way untrusted amplify-and-forward relay network under the imperfect channel state information is investigated. To improve the secrecy of the relay wiretap system, artificial noise is introduced into each source signal. The total and the individual power constraint conditions are considered. To maximize the attainable secrecy rate, an iterative power allocation algorithm is designed under the total power constraint. As a more practical system design, a suboptimal power allocation scheme is proposed. For the sake of comparison, the security performances of the noncooperative interference strategy and the one-way cooperative interference strategy are also investigated. Simulation results demonstrate that the proposed bidirectional cooperative interference schemes perform better in the secrecy rate of communication system.
The security of the two-way relaying system with an eavesdropper is investigated in this paper. A cooperative jamming and power allocation scheme is proposed to enhance the system secrecy capacity. Both user and pre-defined jamming signals are transmitted by each source node simultaneously. The optimum power allocation between the user and jamming signals at each source node is derived. Our analytical results suggest that the proposed cooperative jamming scheme improves on the system secrecy capacity, especially when the channel gains of the two source-relay links are of large difference. Simulation results in close agreement with analytical results clearly demonstrate the advantage of the proposed cooperative jamming scheme.
In this paper, the secrecy performance for a downlink cooperative non-orthogonal multiple access (NOMA) communication system is studied under two cases. In the first case, the presence of an untrusted user is studied. While, the presence of an eavesdropper node is considered in the second case. The base station transmits superimposed information signals to the half-duplex two-way relay node. The relay amplifies-and-forwards the received signal towards the users. This paper studies the effectiveness of two factors on the secrecy performance in terms of secrecy capacity. these factors are the power allocated for each user, and the distance between the untrusted user and the cooperative relay node with respect to the strong user. Moreover, this paper proposes the shared jamming signal strategy in order to enhance the physical layer security of the cooperative NOMA in the presence of an eavesdropper node. Furthermore, simulations of the secrecy capacity are presented and compared with a conventional scheme based on null-steering jamming scheme. Based on the result the proposed technique outperforms the conventional technique in terms the of secrecy capacity.
The security of the three-phase two-way relaying system with an eavesdropper is investigated in this paper. A cooperative jamming and power allocation scheme is proposed to enhance the system secrecy capacity. When a source node transmits user signals to the relay node, the other source node interferes the relay node with pre-defined jamming signals simultaneously. Optimum power allocation between the user and jamming signals at each source node is analyzed. Our analytical results suggest that the proposed cooperative jamming scheme improves on the system secrecy capacity, especially when the channel gains of the two source-relay links are of large difference. Simulation results in close agreement with analytical results clearly demonstrate the advantage of the proposed cooperative jamming scheme.
This paper investigates the physical layer security issue of the three-phase two-way relaying system with an untrusty relay node. New cooperative jamming schemes are proposed for the three-phase bi-directional secrecy communications. The transmit power of each source node is divided into two parts corresponding to the user and jamming signals, respectively. The minimum jamming signal power at each source node is analyzed. An iterative power allocation algorithm is proposed for the three-phase protocol. Numerical results demonstrate the superiority of the proposed cooperative jamming scheme with power allocation.