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

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    Type
    Article
    Authors
    Al-Ebraheemy, Omer Mahmoud Salih
    Salhab, Anas M.
    Chaaban, Anas
    Zummo, Salam A.
    Alouini, Mohamed-Slim cc
    KAUST Department
    Communication Theory Lab
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Date
    2019-01-08
    Online Publication Date
    2019-01-08
    Print Publication Date
    2019-02
    Permanent link to this record
    http://hdl.handle.net/10754/631537
    
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    Abstract
    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.
    Citation
    Al-Ebraheemy OMS, Salhab AM, Chaaban A, Zummo SA, Alouini M-S (2019) Precise Performance Analysis of Dual-Hop Mixed RF/Unified-FSO DF Relaying With Heterodyne Detection and Two IM-DD Channel Models. IEEE Photonics Journal 11: 1–22. Available: http://dx.doi.org/10.1109/JPHOT.2018.2890722.
    Sponsors
    This work was supported in part by the National Plan for Science, Technology and Innovation (Maarifah) King Abdulaziz City for Science and Technology through the Science and Technology Unit at King Fahd University of Petroleum & Minerals (KFUPM) the Kingdom of Saudi Arabia, under Grant 15-ELE4157-04 and in part by the Deanship of Scientific Research in KFUPM under Grant IN161023.
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    IEEE Photonics Journal
    DOI
    10.1109/JPHOT.2018.2890722
    Additional Links
    https://ieeexplore.ieee.org/document/8604038
    ae974a485f413a2113503eed53cd6c53
    10.1109/JPHOT.2018.2890722
    Scopus Count
    Collections
    Articles; Electrical and Computer Engineering Program; Communication Theory Lab; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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