The paper proposes secure wireless communications under practical operation constraints including spectral efficiency, erroneous channel information, and power-constrained multi-antenna users. To release these constraints, the paper exploits non-orthogonal multiple access (NOMA) technology for high spectral efficiency, radio frequency energy harvesting for self-powering, and multiple-input multiple-output (MIMO) transmission for multi-antenna users. In this paper, wireless communications is secure with interfering operation. For evaluation of the efficacy of the proposed secure wireless communications, the research also presents results considering erroneous channel information by modelling it with a well-acknowledged paradigm. Innumerable results demonstrate that the proposed secure wireless communications is superior to the baseline scheme without interfering.
The paper proposes secure wireless communications under practical operation constraints including spectral efficiency, erroneous channel information, and power-constrained multi-antenna users. To release these constraints, the paper exploits non-orthogonal multiple access (NOMA) technology for high spectral efficiency, radio frequency energy harvesting for self-powering, and multiple-input multiple-output (MIMO) transmission for multi-antenna users. In this paper, wireless communications is secure with interfering operation. For evaluation of the efficacy of the proposed secure wireless communications, the research also presents results considering erroneous channel information by modelling it with a well-acknowledged paradigm. Innumerable results demonstrate that the proposed secure wireless communications is superior to the baseline scheme without interfering.
This paper investigates the security aspects of a multiple-input multiple-output (MIMO) network that utilizes a relay and non-orthogonal multiple access (NOMA) to serve multiple users under a potential eavesdropping scenario. Given the security vulnerabilities inherent in spectrally efficient systems, our work establishes a mathematical framework to analyze this specific architecture. We derive new closed-form expressions to characterize the secrecy outage probability (SOP) for individual users and the system as a whole. Through extensive simulations covering various antenna configurations and signal-to-noise conditions, our analysis confirms that the NOMA protocol can provide superior security compared to conventional orthogonal multiple access (OMA) in certain operational domains. These findings underscore the viability of NOMA as a foundational technology for constructing secure, next-generation wireless systems.
Non-orthogonal multiple access (NOMA) is an efficient approach that can improve spectrum utilization and support massive connectivity for next-generation wireless networks. However, over a wireless channel, the superimposed NOMA signals are highly susceptible to eavesdropping, potentially leading to severe leakage of confidential information. In this article, we unleash the potential of network interference and exploit it constructively to enhance physi-cal-layer security in NOMA networks. In particular, three different types of network interference, including artificial noise, specifically-designed jamming signals, and inter-user interference, are well engineered to intentionally reduce information leakage while mitigating the effect on signal reception quality of legitimate users, thereby significantly enhancing the transmission security of NOMA. Furthermore, we propose interference engineering strategies for more advanced full-duplex NOMA, intelligent reflecting surface NOMA, cognitive radio NOMA, and multi-cell NOMA networks, and discuss several open research problems and challenges, which could inspire innovative interference engineering designs for secure NOMA communications.
Non-orthogonal multiple access (NOMA) has been widely considered as a promising technology to enable high-efficient wireless transmissions in future 5G communication systems. In this chapter, we investigate single-input single-output (SISO) NOMA systems from the perspective of physical layer security. There into, two different SISO NOMA systems are studied in sequence so as to explore security issues in NOMA. First, we attempt the physical layer security technique in a SISO NOMA system which consists of a transmitter, multiple legitimate users and an eavesdropper who aims to wiretap the messages intended for all legitimate users. The objective is to maximise sum of secrecy rates subject to an individual quality of service constraint for each legitimate user, respectively. The investigations in this system will provide a preliminary analysis of the secure performance of SISO NOMA systems. Second, on the basis of the SISO NOMA system previously studied, a multi-antenna jammer is additionally equipped to enhance secure transmissions of the system. The joint optimisation of power allocation and beamforming design is considered. The efforts in this second system aim to propose an effective solution for realising secure transmissions for each legitimate user.
Multiple Input Single Output (MISO) Non-orthogonal multiple access (NOMA), combining the benefits of spatial multiplexing with higher spectral efficiency, has recently attained a substantial research interest in 5G and upcoming mobile communication networks. This paper proposes an optimal power control algorithm for downlink secure MISO-NOMA communication involving untrusted users. Sum secure rate maximization of both single antenna users has been considered, while satisfying their quality of service requirements, numerical method is used for optimal power sharing between users, and optimal beamforming vectors have been derived. Simulations validate the analysis, demonstrate the efficacy of the proposed design, and offer design insights into secure MISO-NOMA communications.
It is well known that multi antenna communication schemes improve transmission performance in terms of efficiently exploiting available transmission bandwidth and lowering transmission error probability. But in this paper, it is shown that Multi-Input-Multi-Output (MIMO) systems can be used to implement physically secure wireless transmissions. Specifically, it is possible to combine information symbols in a way that only the legitimate user could detect and identify the received information. Since channel state of each user is random and unique, it can be considered as secret information and be utilized for inherently secure transmission. In this paper a beamforming-like scheme is proposed that makes use of the unique characteristics of the legitimate channel to afford physically secure wireless communication.
Non-orthogonal multiple access (NOMA) is an effective approach to improving spectrum utilization and supporting massive connectivity for next-generation wireless networks. However, over a wireless channel, the superimposed NOMA signals are highly susceptible to eavesdropping, potentially leading to the severe leakage of confidential information. In this article, we unleash the potential of network interference and exploit it constructively to enhance secrecy in NOMA networks. Particularly, three different types of network interference, including artificial noise, a specifically-designed jamming signal, and inter-user interference, are well engineered to intentionally reduce information leakage while mitigating the effects on signal reception quality of the legitimate users, thus significantly enhancing the transmission security of NOMA. Furthermore, we propose potential interference engineering strategies in more advanced full-duplex NOMA, cognitive NOMA, and multi-cell NOMA networks, and discuss various open research problems and challenges, which could inspire innovative designs of interference engineering for secure NOMA communications.