Power Allocation and Performance of Multiuser Mixed RF/FSO Relay Networks With Opportunistic Scheduling and Outdated Channel Information

Salhab, Anas M.; Al-Qahtani, Fawaz S.; Radaydeh, Redha M.; Zummo, Salam A.; Alnuweiri, Hussein

doi:10.1109/jlt.2016.2555944

Cited by 46 publications

(36 citation statements)

References 37 publications

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“…Salhab investigated the performance of a multiuser mixed RF-FSO relay network with generalized order user scheduling and obtained the closed-form expressions for OP, average bit error rate (ABER), and EC in [19]. Then a power allocation scheme was proposed to optimize the performance of the multiuser mixed RF-FSO system in [20]. The performance of mixed dual-hop RF-FSO system is analysed while variable gain relaying scheme was utilized at relay node and the closedform expressions for OP and ABER were derived in [21].…”

Section: A Background and Related Literaturementioning

confidence: 99%

On Secure Mixed RF-FSO Systems With TAS and Imperfect CSI

Lei

Luo

Park

et al. 2020

IEEE Trans. Commun.

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In this work, we analyze the secrecy outage performance of a dual-hop relay system composed of multiple-input-multiple-output radio-frequency (RF) links and a free-space optical (FSO) link while a multiple-antenna eavesdropper wiretaps the confidential information by decoding the received signals from the resource node. The channel state information (CSI) of the RF and FSO links is considered to be outdated. We propose three transmit antenna selection (TAS) schemes to enhance the secrecy performance of the considered systems. The secrecy outage performance with different TAS schemes is analyzed and the effects of misalignment and detection technology on the secrecy outage performance of mixed systems are studied. We derive the closed-form expressions for probability density function (PDF) and cumulative distribution function (CDF) over Málaga channel with imperfect CSI. Then the closed-form expressions for the CDF and PDF of the equivalent signal-to-noise ratio (SNR) at the legitimate receiver over Nakagami-m and Málaga channels are derived. Furthermore, the lower bound of the secrecy outage probability (SOP) with different TAS schemes are derived. Besides, the asymptotic results for SOP are investigated by exploiting the unfolding of Meijer's G-function when the electrical SNR of FSO link approaches infinity. Finally, Monte-Carlo simulation results are presented to testify the correctness of the proposed analysis. The results illustrate that the outdated CSI shows a strong effect on the secrecy outage performance. In addition, increasing the number of antennas at the source cannot significantly enhance the secrecy performance of the considered systems.Manuscript received.Mixed RF-FSO systems, outdated channel state information, physical layer security, secrecy outage probability, transmit antenna selection.

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Section: A Background and Related Literaturementioning

confidence: 99%

On Secure Mixed RF-FSO Systems With TAS and Imperfect CSI

Lei

Luo

Park

et al. 2020

IEEE Trans. Commun.

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“…Also, an analogous scheme to these ones was studied in [14] for fixed and variable gain AF mixed Nakagami-m/G-G relaying. Moreover, a scheme like the one in [8] was inspected in [15], but this time for multiusers (sources) opportunistic scheduling. In addition, the BER and outage probability for AF (fixed and variable gain) mixed RF/FSO schemes were investigated in [16] assuming Nakagami-m and double generalized Gamma fading models for the RF and FSO channels, respectively, and considering the co-channel interference, existence of the direct RF link, and the pointing error.…”

Section: Background and Motivationmentioning

confidence: 99%

Precise Performance Analysis of Dual-Hop Mixed RF/Unified-FSO DF Relaying With Heterodyne Detection and Two IM-DD Channel Models

et al. 2019

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This paper provides precise performance analysis of the dual-hop mixed radio frequency (RF)/unified free space optical (FSO) decode-and-forward (DF) relaying system, in which the heterodyne detection and the intensity modulation-direct detection (IM-DD) are taken into account for FSO detection. To this end, we derive closed-form expressions for the outage probability, average bit error rate (BER), and the ergodic channel capacity of this system. In this analysis, we utilize, for the first time as per our knowledge, a precise channel capacity result for the IM-DD channel. Moreover, this is the first time that not only the (IM-DD input-independent) but also the (IM-DD cost-dependent) additive white Gaussian noise (AWGN) channel is considered in such system analyses. Additionally in this study, we assume that the first hop (RF link) follows Nakagami-m fading, and the second hop (FSO link) follows Málaga (M) turbulence with pointing errors. These fading and turbulence models contain other models (such as Rayleigh and Gamma-Gamma) as special cases, thus, our analyses can be seen as a generalized one from the RF and FSO fading models point of view. Also, in BER derivation, we assume that the modulation schemes in the two hops can be different, since not all modulation schemes are suitable for IM-DD FSO links. In addition, the system performance is investigated asymptotically at high signal to noise ratios. This investigation leads to new nonreported coding gain and diversity order analyses of such system. Interestingly, we find that in the FSO hop, at high transmitted powers, all the considered FSO detectors result in the same diversity order. Furthermore, we provide simulation results that verify the accuracy of the obtained analytical and asymptotic expressions.

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“…Therefore, a single relay mixed RF/FSO system with outdated CSI has been studied in the work of Varshney and Puri where the performance of a mixed RF/FSO system with a moving source user‐equipment unit was evaluated under different detection schemes. Moreover, Salhab et al investigated the performance of multiuser mixed RF/FSO system with transmit opportunistic scheduling and outdated CSI of the RF link under a single AF relay unit. Nevertheless, mixed RF/FSO system with outdated CSI under partial relay selection has been studied in the work of Petkovic et al where the performance of partial relay selection (PRS) variable gain AF relays mixed RF/FSO system with outdated CSI was investigated.…”

Section: Introductionmentioning

confidence: 99%

Security outage performance of partial relay selection in AF mixed RF/FSO system with outdated channel state information

Odeyemi

Owolawi

2019

Trans Emerging Tel Tech

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In this paper, the secrecy outage performance of a partial relay selection–based mixed radio frequency/free‐space optical (RF/FSO) system with outdated channel state information is studied. All the RF links are modeled in Rayleigh fading, and the FSO link is subjected to Gamma‐Gamma fading with/or without pointing errors in relation to the two detection techniques such as heterodyne detection and intensity modulation with direct detection. It is assumed that the relay nodes employ fixed gain and variable gain amplified‐and‐forward relaying protocols. Thus, unified cumulative distribution functions of the equivalent end‐to‐end signal to noise ratio for both the AF relaying schemes are then derived. Utilizing the cumulative distribution functions, the closed‐form expressions for the lower bound secrecy outage probability under the two relaying protocols are then obtained for the concerned system. Moreover, the impacts of turbulence, pointing errors, detection techniques, outdated channel state information, and relay selection are investigated. The finding demonstrated that the variable gain relaying mixed RF/FSO system offers much better secrecy performance compared with the fixed gain relaying system. Monte Carlo simulation results are provided to validate the accuracy of the analysis.

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Power Allocation and Performance of Multiuser Mixed RF/FSO Relay Networks With Opportunistic Scheduling and Outdated Channel Information

Cited by 46 publications

References 37 publications

On Secure Mixed RF-FSO Systems With TAS and Imperfect CSI

On Secure Mixed RF-FSO Systems With TAS and Imperfect CSI

Precise Performance Analysis of Dual-Hop Mixed RF/Unified-FSO DF Relaying With Heterodyne Detection and Two IM-DD Channel Models

Security outage performance of partial relay selection in AF mixed RF/FSO system with outdated channel state information

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