Cognitive Decode-and-Forward MIMO-RF/FSO Cooperative Relay Networks

Varshney, Neeraj; Jagannatham, Aditya K.

doi:10.1109/lcomm.2016.2647244

Cited by 61 publications

(49 citation statements)

References 12 publications

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“…For example, the common performance of mixed multiple-input single-output (MISO) RF-FSO systems was investigated in [6]. Varshney et al analyzed cognitive multiple-input-multiple-output (MIMO) RF-FSO systems with perfect and imperfect channel state information (CSI) in [7], [8], and [9], respectively. Moreover, the performance of mixed RF-FSO systems with opportunistic scheduling scheme was investigated in [10].…”

Section: A Background and Related Literaturementioning

confidence: 99%

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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 The channel state information (CSI) of the RF and FSO links is considered to be outdated.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 The results illustrate that the outdated CSI shows a strong effect on the secrecy outage performance.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%

“…• Differing from [7], in which the TAS scheme was utilized to enhance the common performance while reducing the hardware complexity, in this work, we propose three different TAS schemes to improve the secrecy performance while the imperfect CSI of both RF and FSO links are considered.…”

Section: B Motivation and Contributionsmentioning

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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“…The correlation parameter ρ i corresponding to the relative speed of ν i can be obtained by using the standard Jake's model [9] as, ρ i = J 0 2πfcνi Rsc , where J 0 (·) is the zeroth-order Bessel function of the first kind, the carrier frequency and symbol rate are set as f c = 5.9 GHz and R s = 9.5 kbps respectively. Further, similar to [23], it is assumed that the FSO link experiences atmospheric turbulence with C 2 n ∈ {3×10 −14 , 1×10 −13 } m −2/3 , link length L ∈ {1, 2} km, θ = 1, aperture radius r = 0.1 m, and laser wavelength λ = 1.55× 10 −6 m. Under these conditions, the various parameters for…”

Section: Simulation Resultsmentioning

confidence: 99%

Cognitive MIMO-RF/FSO Cooperative Relay Communication With Mobile Nodes and Imperfect Channel State Information

Varshney

Jagannatham

Varshney

2018

IEEE Trans. Cogn. Commun. Netw.

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This work analyzes the performance of an underlay cognitive radio based decode-and-forward mixed multipleinput multiple-output (MIMO) radio frequency/free space optical (RF/FSO) cooperative relay system with multiple mobile secondary and primary user nodes. The effect of imperfect channel state information (CSI) arising due to channel estimation error is also considered at the secondary user transmitters (SU-TXs) and relay on the power control and symbol detection processes respectively. A unique aspect of this work is that both fixed and proportional interference power constraints are employed to limit the interference at the primary user receivers (PU-RXs). Analytical results are derived to characterize the exact and asymptotic outage and bit error probabilities of the above system under practical conditions of node mobility and imperfect CSI, together with impairments of the optical channel, such as path loss, atmospheric turbulence, and pointing errors, for orthogonal space-time block coded transmission between each SU-TX and relay. Finally, simulation results are presented to yield various interesting insights into the system performance such as the benefits of a midamble versus preamble for channel estimation.

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“…SP is the channel coefficient for the kth SU-TX and PU-RX link, P M denotes the maximum transmit power of the SU-TX, and P A represents the interference threshold at the PU-RX. Similar to existing works [7][8][9], this work also assumes P M >> PA |h (k) SP | 2 for analytical tractability. However, this assumption can be relaxed but at the expense of more involved analytical treatments.…”

Section: System Modelmentioning

confidence: 94%

Opportunistic Scheduling in Underlay Cognitive Radio Based Systems: User Selection Probability Analysis

Varshney

Sharma

Alouini

2018

2018 IEEE Global Conference on Signal and Information Processing (GlobalSIP)

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In this paper, an underlay cognitive radio (CR) system is considered with multiple cognitive or secondary users contending to transmit their information to the cognitive destination (e.g., eNodeB) using the spectral resource of a primary user. The novel closed-form expressions are derived for the selection probabilities of cognitive users with opportunistic scheduling wherein an optimal metric is employed for opportunistic transmission. The analytical results corroborated by the Monte Carlo simulations, can be used to demonstrate the fairness achieved in opportunistic scheduling. It is shown that the fairness in terms of equal chance for transmission amongst all cognitive users can only be seen for the scenarios when the fraction of distances between the cognitive transmitter and cognitive receiver, and cognitive transmitter and primary receiver is identical for each of the cognitive transmitters.

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Cognitive Decode-and-Forward MIMO-RF/FSO Cooperative Relay Networks

Cited by 61 publications

References 12 publications

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

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

Cognitive MIMO-RF/FSO Cooperative Relay Communication With Mobile Nodes and Imperfect Channel State Information

Opportunistic Scheduling in Underlay Cognitive Radio Based Systems: User Selection Probability Analysis

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