Multiuser diversity for mixed RF/FSO cooperative relaying in the presence of interference

Upadhya, Abhijeet; Dwivedi, Vivek K.; Singh, Ghanshyam

doi:10.1016/j.optcom.2019.02.040

Cited by 28 publications

(7 citation statements)

References 19 publications

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“…In the same context, asymmetric RF/FSO relaying systems have been introduced by the authors of Lee et al, 14 where the RF link has been assumed to undergo Rayleigh fading, whereas the FSO link undergoes Gamma–Gamma atmospheric turbulence. Similar schemes involving mixed RF/FSO have been analyzed in research works 15–22 . In Zedini et al, 15 the RF link has been modeled as Nakagami‐ m fading channel along with pointing errors on the FSO link modeled as Gamma–Gamma‐distributed fading.…”

Section: Introductionmentioning

confidence: 99%

“…Similar schemes involving mixed RF/FSO have been analyzed in research works. [15][16][17][18][19][20][21][22] In Zedini et al, 15 the RF link has been modeled as Nakagami-m fading channel along with pointing errors on the FSO link modeled as Gamma-Gamma-distributed fading. Fixed gain mixed RF/FSO relaying over α − μ fading channels have been analyzed in Upadhya et al, 20 whereas variable gain relays have been studied by the authors of Yang et al 16 where the RF and FSO links have been modeled as exponential and Malaga distributions, respectively.…”

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confidence: 99%

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Diversity aided millimeter‐wave/free space optical cooperative relaying systems

Goel

Upadhya

Dwivedi

2021

Int J Communication

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In this paper, we investigate the performance of mixed millimeter-wave (mmWave)/multiple input multiple output (MIMO)-free space optics (FSO) cooperative relaying system. The mmWave link is assumed to undergo multipath fading and shadowing which has been modeled as generalized-K distributed fading, whereas the diversity aided FSO link is considered to experience Gamma-Gamma turbulence. We consider amplify-and-forward (AF) relaying strategy and multiple signals arriving at the receiver are combined using equal gain combining (EGC) scheme. Analytical closed form expressions for performance metrics such as outage probability, bit error rate (BER), and the ergodic channel capacity are derived in terms of bivariate Fox's H-function for the considered mixed mmWave/MIMO-FSO relaying system. In order to further simplify the obtained results, we analyze the system performance for the case of high signal-to-noise ratio (SNR) to present the asymptotic expressions for the outage probability and BER in terms of elementary functions. To this end, we have formulated an optimum power allocation scheme which minimizes the probability of outage experienced by the end user by allocating the optimum power on the FSO link. We also analyze the proposed system for the impact of pointing errors in a separate section by deriving closed-form expressions for the outage probability and BER. Finally, numerical results have been demonstrated the findings of the research work which have supplemented by Monte Carlo simulations.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Diversity aided millimeter‐wave/free space optical cooperative relaying systems

Goel

Upadhya

Dwivedi

2021

Int J Communication

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“…Over the last few decades, the per capita demand for data has increased manifolds, and this pattern only seems to become more and more aggressive in the near future [1][2][3]. The recent surge in popularity of free-space optical (FSO) systems as a commercial alternative to radio-frequency (RF) systems is attributed to a wide range of advantages such as 1) massive bandwidth of the order of THz, 2) adaptability with present-day radio systems as RF/FSO systems [4,5], 3) license-free spectrum, 4) negligible interference from the adjacent carriers, and 5) plug-play character which makes the FSO systems very convenient to install and relocate [6,7]. FSO systems have begun witnessing commercial and large-scale deployment in cases of disaster management, LAN connectivity within campuses, vehicle-to-vehicle communication, and backhaul services for futuristic cellular networks [8,9].…”

Section: Introductionmentioning

confidence: 99%

Developing Cost-Effective and High-Speed 40 Gbps FSO Systems Incorporating Wavelength and Spatial Diversity Techniques

et al. 2021

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Free-space optical (FSO) communication systems are being anticipated to offer promising alternatives to existing radio networks in delivering high-speed data access to end-users. Ease of installation, robust features, and cost-effective operation have been the hallmark of FSO systems, and these features will play an obvious role in deciding the ways in which futuristic smart communication models will operate. Despite these arrays of features, FSO links suffer severe performance degradation due to channel-induced impairments caused by atmospheric effects such as rain, haze, and fog. In this work, we have investigated and compared the performance of 40 Gbps FSO links for different channel conditions ranging from clear weather to severe attenuation by incorporating spatial and wavelength diversity as performance booster techniques. The use of an erbium-doped fiber amplifier (EDFA) with FSO links has also been proposed here. Using performance metrics like bit error rate (BER) and eye patterns, it has been found that the use of EDFA not only helps in compensating for the link losses but also aids in realizing an all-optical processing based last-mile access system. The proposed FSO system will be capable of bridging the existing backbone fiber networks with end-users with minimal changes to the existing hardware regime, thereby proving to be extremely cost-effective in sharp contrast to radio-frequency generations which require major infrastructure overhaul.

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“…Moreover, the effect of multiple CCIs on the mixed RF/FSO OWR systems have been analyzed in [5] where the authors have derived expressions of the OP, BER and capacity for channel state information (CSI) assisted system. On the other hand, impact of multiuser diversity (MUD) on interference limited mixed RF/FSO OWR systems has been indicated by the authors of [6]. Furthermore, research work [7] demonstrates the improvement imparted by MUD scheme on mixed RF/FSO TWR system for interference free transmission.…”

Section: Introductionmentioning

confidence: 99%

Interference-Limited Mixed MUD-RF/FSO Two-Way Cooperative Networks Over Double Generalized Gamma Turbulence Channels

2019

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In this letter, the performance of multiuser-radio frequency/free space optics (RF/FSO) two-way relay network in the presence of interference is investigated. The FSO link accounts for pointing errors and both types of detection techniques, i.e. intensity modulation/direct detection as well as coherent demodulation, which is modeled as double generalized gamma (D-GG) turbulence channel. On the other hand, the multiple users on the RF link are assumed to undergo Nakagami-m fading. Multiple co-channel interferers (CCIs) which corrupt the signal at relay node are modeled using Nakagami-m distribution. Specifically, the exact closed-form expressions for the outage probability (OP) of the overall system is derived. Moreover, the closed form expression for the achievable sum-rate (ASR) of the considered system is presented. In order to simplify the results, the asymptotic approximations of the OP and ASR are derived in terms of elementary functions. The results presented in the paper are validated by Monte-Carlo simulations.

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Multiuser diversity for mixed RF/FSO cooperative relaying in the presence of interference

Cited by 28 publications

References 19 publications

Diversity aided millimeter‐wave/free space optical cooperative relaying systems

Diversity aided millimeter‐wave/free space optical cooperative relaying systems

Developing Cost-Effective and High-Speed 40 Gbps FSO Systems Incorporating Wavelength and Spatial Diversity Techniques

Interference-Limited Mixed MUD-RF/FSO Two-Way Cooperative Networks Over Double Generalized Gamma Turbulence Channels

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