Outage Analysis of Mixed Underlay Cognitive RF MIMO and FSO Relaying With Interference Reduction

Al-Qahtani, Fawaz S.; El‐Malek, Ahmed H. Abd; Ansari, Imran Shafique; Radaydeh, Redha M.; Zummo, Salam A.

doi:10.1109/jphot.2017.2665969

Cited by 34 publications

(29 citation statements)

References 27 publications

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“…For this set-up, [24] investigated the DF CR RF-FSO scheme where outage probability was obtained and diversity analysis was conducted for Nakagami-m/GG fading channels, whereas [25] and [26] investigated the MIMO CR RF-FSO relaying where various diversity techniques were enabled at the RF path, and important system indicators were obtained in the presence of practical channel imperfections like nodes mobility. Moreover, [27] considered different interference cancellation techniques at the RF side for the AF CR RF-FSO scheme and derived outage probability for Rayleigh/GG fading. Finally, [28] was investigated DF CR RF-FSO relaying for Nakagami-m/EW fading channels where outage probability and ergodic capacity were derived for a mean-value power allocation scheme without considering the instantaneous interference channel of the primary network (PN).…”

Section: Introductionmentioning

confidence: 99%

On the Error Probability of Cognitive RF-FSO Relay Networks Over Rayleigh/EW Fading Channels With Primary-Secondary Interference

et al. 2020

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Free space optical (FSO) communication has emerged to provide line of sight connectivity and higher throughput over unlicensed optical spectrums. Cognitive radio (CR), on the other hand, can utilize the radio frequency (RF) spectrum and allow a secondary user (SU) to share the same spectrum with the primary user (PU) as long as the SU does not impose interference on the PU. Owing to the potential of these emerging technologies, to provide full spectrum efficiency, this paper focuses on the mixed CR RF-FSO transmission scheme, where RF communication is employed at one hop followed by the FSO transmission on the other hop in a dual-hop decode-and-forward (DF) configuration. To quantify the performance of the proposed scheme, closed form error probability is derived over Rayleigh/Exponentiated Weibull (EW) fading distributions by considering the statistical and instantaneous feedback channel of the primary network. We also employed an asymptotic analysis to illustrate the diversity gain of the overall system. We believe that the proposed scheme can be applicable to the 5G+ networks where an unlicensed university student connects to the home computer with the aid of an FSO path.

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Section: Introductionmentioning

confidence: 99%

On the Error Probability of Cognitive RF-FSO Relay Networks Over Rayleigh/EW Fading Channels With Primary-Secondary Interference

et al. 2020

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“…It can be observed that for the scenarios when each SU-TX is located at equal distance from eNodeB and PU-RX, each SU-TX has equal probability of being selected for transmission. 3 The integral in (13) and (18) are solved for the scenario where a = b = c. Therefore, for simulation purposes, we considered d SD,k ≈ d SP,k ≈ 2 ∀k, where d SD,1 = 2.002, d SD,2 = 2.004, d SD,3 = 2.006, d SP,1 = 2.001, d SP,2 = 2.003, and d SP,3 = 2.005. For the scenario, when 2nd SU-TX is closer to the eN-odeB than the PU-RX, i.e., d SP,k ≈ d SD,k ≈ 2, ∀k except d SD,2 ≈ 1 as shown in Fig.…”

Section: Simulation Resultsmentioning

confidence: 99%

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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“…Generally, OP is defined as the probability that SNR or SINR falls below a certain threshold [17]. In this system, we discuss the OP performance for both RF/FSO (S1-R-S2) and FSO/RF (S2-R-S1) links, which can efficiently evaluate the performance of the two-way system.…”

Section: Outage Probabilitymentioning

confidence: 99%

“…Moreover, when γ th /γ → 0, Meijer-G function in Eq (17). has series representation based on[16, Eq.…”

mentioning

confidence: 99%

Two-Way Mixed RF/FSO Relaying System in the Presence of Co-channel Interference

2019

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In this paper, the performance of a two-way mixed radio frequency/free space optical (RF/FSO) relaying system in the presence of co-channel interference (CCI) is investigated. The RF links are modeled as Nakagami-m distribution, and FSO links adopt Gamma-Gamma turbulence model. To improve spectral efficiency, relay exchanges the information between two terminals in three phases via RF and FSO links. Meanwhile, CCIs are considered at both relay and destination. Novel closed-form upper bounds expressions for the signal to interference plus noise ratios are derived, based on that lower bounds outage probability, average bit error rate, and outage capacity are further presented for both RF/FSO and FSO/RF links. Then, asymptotic expressions are provided to predict the diversity order. Additionally, the effect of various parameters on system performance, such as interference numbers and power, are investigated and compared including interference-free condition. Simulation results show that, in the interference-effected system, when the average signalto-noise ratio increases, system performance enhances first and then remains unchanged. This phenomenon does not occur in the interference-free system, which implies the system performance is limited by the numbers and power of CCIs. Moreover, the effect of pointing errors on system performance is further investigated.

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Outage Analysis of Mixed Underlay Cognitive RF MIMO and FSO Relaying With Interference Reduction

Cited by 34 publications

References 27 publications

On the Error Probability of Cognitive RF-FSO Relay Networks Over Rayleigh/EW Fading Channels With Primary-Secondary Interference

On the Error Probability of Cognitive RF-FSO Relay Networks Over Rayleigh/EW Fading Channels With Primary-Secondary Interference

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

Two-Way Mixed RF/FSO Relaying System in the Presence of Co-channel Interference

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