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International Conference on Artificial Intelligence and Signal Processing (AISP)

An Optimal/Fixed Power Allocation Schemes for Overlay CR-NOMA System with Untrusted Users

I Swathi Priya, Suseela Vappangi

Published Oct 26, 2024• 0 citations
Publisher

Abstract

In order to resolve the security issues in 5G and future wireless networks, physical layer security (PLS) and cognitive radio (CR) technologies can be used with non-orthogonal multiple access (NOMA) to greatly improve spectrum efficiency (SE). However, privacy of information is a risk due to resource sharing in CR or NOMA. Protecting sensitive information in CR-inspired NOMA (CR-NOMA) transmissions is possible by utilizing PLS features, whilst NOMA makes use of channel property differences for bandwidth effectiveness. The objective of this work is to examine the level of secrecy achieved in a 5G overlay downlink CR-NOMA network when untrusted users encounter a Rayleigh fading channel. The analysis takes place in both imperfect and perfect successive interference cancellation (SIC) configurations. Additionally, we derive mathematical expressions for the secrecy outage probability (SOP) and, more significantly, the effective secrecy throughput (EST) of the proposed system in order to further improve the performance of users in both fading and non-fading scenarios. In addition, this work offers an optimal power allocation (PA) scheme that primarily considers the specific quality of service (QoS) requirements of two users. Subsequently, it determines the most favorable values for the PA factors in an effort to further improve the performance of secrecy. Furthermore, under perfect/imperfect SIC modes, this work presents the performance comparison between two untrusted users and the derived analytical closed-form expressions were verified via Monte Carlo models employing various channel characteristics.

DOI
10.1109/aisp61711.2024.10870828

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In order to resolve the security issues in 5G and future wireless networks, physical layer security (PLS) and cognitive radio (CR) technologies can be used with non-orthogonal multiple access (NOMA) to greatly improve spectrum efficiency (SE). However, privacy of information is a risk due to resource sharing in CR or NOMA. Protecting sensitive information in CR-inspired NOMA (CR-NOMA) transmissions is possible by utilizing PLS features, whilst NOMA makes use of channel property differences for bandwidth effectiveness. The objective of this work is to examine the level of secrecy achieved in a 5G overlay downlink CR-NOMA network when untrusted users encounter a Rayleigh fading channel. The analysis takes place in both imperfect and perfect successive interference cancellation (SIC) configurations. Additionally, we derive mathematical expressions for the secrecy outage probability (SOP) and, more significantly, the effective secrecy throughput (EST) of the proposed system in order to further improve the performance of users in both fading and non-fading scenarios. In addition, this work offers an optimal power allocation (PA) scheme that primarily considers the specific quality of service (QoS) requirements of two users. Subsequently, it determines the most favorable values for the PA factors in an effort to further improve the performance of secrecy. Furthermore, under perfect/imperfect SIC modes, this work presents the performance comparison between two untrusted users and the derived analytical closed-form expressions were verified via Monte Carlo models employing various channel characteristics.
Non-orthogonal multiple access (NOMA) can be combined with physical layer security technology to greatly improve spectral efficiency while tackling security issues for the Internet of Things (IoT) networks. This paper investigates the security performance in a fifth-generation (5G) downlink NOMA system with an untrusted user in the presence of imperfect successive interference cancellation (SIC). Analytical expressions of secrecy outage probability (SOP) and connection outage probability (COP) are derived as performance metrics to evaluate the secrecy of the proposed system. In order to further improve the secrecy performance, we propose an optimal power allocation scheme based on two users' different quality of service (QoS) requirements and obtain a closed-form solution of the optimal parameter. Through numerical simulations and exhaustive search algorithm, we validate the correctness of the derived analytical results. It is proved that the proposed power allocation scheme can achieve the optimal secrecy performance.
Non-orthogonal multiple access (NOMA) has come to the fore as a spectrally efficient technique for fifth-generation networks and beyond. At the same time, NOMA faces severe security issues in the presence of untrusted users due to successive interference cancellation (SIC)-based decoding at receivers. In this paper, to make the system model more realistic, we consider the impact of imperfect SIC during the decoding process. Assuming the downlink mode, we focus on designing a secure NOMA communication protocol for the considered system model with two untrusted users. In this regard, we obtain the power allocation bounds to achieve a positive secrecy rate for both near and far users. Analytical expressions of secrecy outage probability (SOP) for both users are derived to analyze secrecy performance. Closed-form approximations of SOPs are also provided to gain analytical insights. Lastly, numerical results have been presented, which validate the exactness of the analysis and reveal the effect of various key parameters on achieved secrecy performance.
This paper investigates the physical layer security (PLS) of non-orthogonal multiple access (NOMA)-enabled overlay cognitive radio networks (NOMA-OCRNs), considering multiple non-colluding eavesdroppers. Here PLS is evaluated in terms of: (i) secrecy outage probability (SOP) of primary user (PU) and secondary user (SU) and (ii) system SOP (SSOP), system secrecy throughput (SST) and secrecy energy efficiency (SEE) of the network. Residual hardware impairments arising from non-ideal hardware and imperfect successive interference cancellation conditions are considered. Firstly, we derive new analytical expressions for the SOPs of PU and SU. Numerical evaluation results show that both PU as well as SU suffer very high SOPs that tend to unity in the high transmit power region. Further, RHI and i-SIC have a significant impact on the secrecy performance. To improve the PLS performance, we propose a jamming-assisted framework and develop novel analytical models for determining the SOPs of PU and SU. We derive the asymptotic SOP expressions as well. Detailed analytical and simulation results are presented to demonstrate that the proposed jamming-assisted framework leads to a significant reduction of the SOPs of both PU and SU while exhibiting considerable enhancement of SST and SEE of the network compared to the no-jammer scenario. In the final part of this paper, we utilize a deep learning framework for the precise and fast prediction of the SOPs of PU and SU, that can replace complex mathematical modeling.
This letter studies the secure transmission issue of non-orthogonal multiple access (NOMA) based cognitive radio networks (CRNs) with imperfect channel state information (CSI), where the secondary user (SU) transmitter aims to transmit the normalized messages to two receiversUa{U_{a}}Ua​andUb{U_{b}}Ub​, and concurrentlyUb{U_{b}}Ub​with full-duplex (FD) ability implements jamming to confuse the eavesdropping of the illegal user while causing zero interference to the primary user andUa{U_{a}}Ua​. Under this setup, the novel exact closed-form expressions of connection outage probability (COP), secrecy outage probability (SOP) and effective secrecy throughput (EST) for each SU receiver under Rayleigh fading channels are derived. Simulation results are presented to demonstrate that: 1) the proposed scheme can achieve pretty good security and reliability performance, but there exist trade-off between such two indicators; 2) the FD-NOMA operation performs better than the half-duplex (HD) NOMA and HD orthogonal multiple access (OMA) in term of EST.
Non-Orthogonal Multiple Access (NOMA) is a wireless communication technique that uses the Successive Interference Cancellation (SIC) strategy to achieve high efficiency. However, SIC can pose security risks in an untrusted NOMA environment where users can suffer from internal eavesdropping. In this research paper, we propose security solutions for downlink NOMA transmission involving two untrusted user terminals and imperfect SIC. Specifically, we investigate the ergodic secrecy rate performance in NOMA for two user terminals against mutual eavesdropping. To achieve the maximum weighted ergodic sum secrecy rate of the system while meeting the quality of service (QoS) requirements of both user terminals, we formulate an optimization problem for power allocation. Our solution approach considers a decoding order that yields the best possible outcome and employs an iterative method to obtain the optimal power allocation. Simulation results confirm the analytical claims and provide key insights on the optimal design parameters. Lastly, we numerically demonstrate that our proposed power control and decoding order design outperforms the benchmark schemes in terms of weighted ergodic sum secrecy rate performance.
Spectrally-efficient secure non-orthogonal multiple access (NOMA) has recently attained a substantial research interest for fifth generation development. This work explores crucial security issue in NOMA which is stemmed from utilizing the decoding concept of successive interference cancellation. Considering untrusted users, we design a novel secure NOMA transmission protocol to maximize secrecy fairness among users. A new decoding order for two users' NOMA is proposed that provides positive secrecy rate to both users. Observing the objective of maximizing secrecy fairness between users under given power budget constraint, the problem is formulated as minimizing the maximum secrecy outage probability (SOP) between users. In particular, closed-form expressions of SOP for both users are derived to analyze secrecy performance. SOP minimization problems are solved using pseudoconvexity concept, and optimized power allocation (PA) for each user is obtained. Asymptotic expressions of SOPs, and optimal PAs minimizing these approximations are obtained to get deeper insights. Further, globally-optimized power control solution from secrecy fairness perspective is obtained at a low computational complexity and, asymptotic approximation is obtained to gain analytical insights. Numerical results validate the correctness of analysis, and present insights on optimal solutions. Finally, we present insights on global-optimal PA by which fairness is ensured and gains of about 55.12%, 69.30%, and 19.11%, respectively are achieved, compared to fixed PA and individual users' optimal PAs.