The Role of New Technologies in Solving the Spectrum Shortage [Point of View]

Reed, Jeffrey; Vassiliou, Marius S.; Shah, Syed Hashim Ali

doi:10.1109/jproc.2016.2562758

Cited by 30 publications

(23 citation statements)

References 10 publications

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“…where i ∈ {R, D}, j ∈ {S, R}. Using Lagrangian duality and applying the KKT conditions, the optimum values of Lagrangian multipliers can be found as ζ j,i = β [1] j,i − β [2] j,i − β [3] j,i +β [4] j,i…”

Section: Algorithmmentioning

confidence: 99%

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Secrecy Performance of Decode-and-Forward Based Hybrid RF/VLC Relaying Systems

et al. 2019

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In this paper, we consider the secrecy of a hybrid radio frequency (RF)/visible light communication (VLC) system equipped with decode-and-forward relaying. We develop physical layer security algorithms that mitigate eavesdropping on both RF and VLC networks based on zero-forcing beamforming techniques. We evaluate the system performance in terms of secrecy capacity (SC) and outage probability (OP) for two network scenarios, namely non-cooperative (NCPS) and cooperative power saving (CPS) models. The NCPS case assumes fixed power at both source and relay while the CPS case assumes total average power shared between the source and relay. Our objective is to find the minimum power that satisfies a specific SC for both cases. Our simulation results show that CPS policy achieves higher SC and maintain lower OP compared with the NCPS one for the same amount of power. We also show that, for both cases, the hybrid RF/VLC network can improve SC compared with standalone RF or VLC networks. INDEX TERMS Beamforming (BF), decode-and-forward (DF), maximal ratio combining (MRC), optimization, physical layer security (PLS), radio frequency (RF), relaying, visible light communication (VLC).

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Section: Algorithmmentioning

confidence: 99%

“…This growth has been driven by new technologies (e.g., Internet-of-Things (IoT), etc. [1]) and the increasing demand of high datarate mobile broadband applications [2]. The RF spectrum congestion limits the service providers from offering new services [3].…”

Section: Introductionmentioning

confidence: 99%

Secrecy Performance of Decode-and-Forward Based Hybrid RF/VLC Relaying Systems

et al. 2019

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“…Following (1) and 3and considering the availability of multiple relays, we can express the corresponding RF and VLC SNR values at node j ∈ {R k , D } as…”

Section: Joint Relay-jammer Selection Schemementioning

confidence: 99%

“…Due to the unprecedented expansion of wireless traffic volumes in the radio frequency (RF) spectrum (for instance, Internet of Things (IoT) is one of the reasons of such spectrum contingency [1]), industrial and academic players have recently proposed to exploit visible light communication (VLC) technology. One of the main advantages of the VLC is that it can be simultaneously used for illumination and communication purposes in a wide unregulated spectrum range (from 430 THz to 790 THz) [2]- [7].…”

Section: Introductionmentioning

confidence: 99%

Joint Beamforming Design and Power Minimization for Friendly Jamming Relaying Hybrid RF/VLC Systems

et al. 2019

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In this paper, we study physical layer security (PLS) aspects of a hybrid radio frequency (RF)/visible light communication (VLC) system with multiple decode-and-forward relaying nodes equipped with friendly jamming capabilities. We first propose a novel joint relay-jammer selection algorithm to enhance the secrecy performance of the network. Next, we obtain beamforming vectors and the minimal power values, which satisfy the required secrecy threshold. Our simulation results show that the proposed hybrid RF/VLC scheme obtains higher secrecy capacity compared to the standalone VLC and RF technologies. Finally, we proved the proposed technique to be an eavesdropping-resilient PLS solution.

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“…IoT networks can deliver a superior performance in terms of energy consumption, spectral efficiency, and low latency [5]. On the other hand, due to the massive connectivity and high traffic volume, IoT networks demand more spectrum channels by over-loading the limited radio spectrum with a large number of devices [6]. Thus, increasing spectrum efficiency is a primary task for IoT networks.…”

Section: Introductionmentioning

confidence: 99%

Hardware- and Interference-Limited Cognitive IoT Relaying NOMA Networks With Imperfect SIC Over Generalized Non-Homogeneous Fading Channels

et al. 2020

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Internet-of-Things (IoT) technology has received much attention due to its great potential to interconnect billions of devices in a broad range of applications. IoT networks can provide high-quality services for a large number of users and smart objects. On the other hand, massive connectivity in IoT networks brings problems associated with spectral congestion. This issue can be solved by applying cognitive radio (CR) and non-orthogonal multiple access (NOMA) techniques. In this respect, this paper studies the performance of cooperative CR-NOMA enabled IoT networks over a generalized α − µ fading channel model. Closed-form analytical expressions of the end-to-end outage probability (OP) for the secondary NOMA users are derived using the Meijer's G-function with a consideration of the impacts of the interference temperature constraint, primary interference, residual hardware impairments and imperfect successive interference cancellation. Moreover, to acquire some useful insights on the system performance, asymptotic closed-form OP expressions are provided. Additionally, the impact of α and µ fading parameters on the outage performance is examined and, as a result, it is concluded that the system performance sufficiently improves as α and/or µ increase. Furthermore, the outage performance of the proposed system model is shown to outperform that of an identical IoT network operating on orthogonal multiple access. Finally, the provided closed-form OP expressions are validated with Monte Carlo simulations. INDEX TERMS α − µ fading, cognitive radio (CR), cooperative communications, Internet-of-Things (IoT), non-homogeneous generalized fading, non-orthogonal multiple access (NOMA), outage probability (OP).

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The Role of New Technologies in Solving the Spectrum Shortage [Point of View]

Cited by 30 publications

References 10 publications

Secrecy Performance of Decode-and-Forward Based Hybrid RF/VLC Relaying Systems

Secrecy Performance of Decode-and-Forward Based Hybrid RF/VLC Relaying Systems

Joint Beamforming Design and Power Minimization for Friendly Jamming Relaying Hybrid RF/VLC Systems

Hardware- and Interference-Limited Cognitive IoT Relaying NOMA Networks With Imperfect SIC Over Generalized Non-Homogeneous Fading Channels

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