Outage Analysis of Mixed FSO/WiMAX Link
In this paper, we study the outage performance of a complex system consisting of a free-space optical (FSO)/radio-frequency (RF) link. Using radio over free-space optics technology, the FSO link carries Worldwide Interoperability for Microwave Access (WiMAX) signals from a core network to a WiMAX ba...
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IEEE
2016-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/7377007/ |
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| author | Nemanja Zdravkovic Milica I. Petkovic Goran T. Djordjevic Kimmo Kansanen |
| author_facet | Nemanja Zdravkovic Milica I. Petkovic Goran T. Djordjevic Kimmo Kansanen |
| author_sort | Nemanja Zdravkovic |
| collection | DOAJ |
| description | In this paper, we study the outage performance of a complex system consisting of a free-space optical (FSO)/radio-frequency (RF) link. Using radio over free-space optics technology, the FSO link carries Worldwide Interoperability for Microwave Access (WiMAX) signals from a core network to a WiMAX base station, delivering traffic to multiple end RF users. A novel closed-form analytical expression for overall outage probability is derived when <inline-formula> <tex-math notation="LaTeX">$M$</tex-math></inline-formula>-ary phase-shift keying ( <inline-formula> <tex-math notation="LaTeX">$M$</tex-math></inline-formula>-PSK) and <inline-formula> <tex-math notation="LaTeX">$M$</tex-math></inline-formula>-ary quadrature amplitude modulation ( <inline-formula> <tex-math notation="LaTeX">$M$</tex-math></inline-formula>-QAM) are applied. The analysis is performed when the FSO link is under the influence of the Gamma–Gamma turbulence, path loss, and misalignment between the transmitter and receiver apertures, and the RF part is influenced by the Gamma-shadowed Nakagami- <inline-formula> <tex-math notation="LaTeX">$m$</tex-math></inline-formula> multipath fading. To illustrate the usefulness of the derived expressions, we present some numerical results that enable us to estimate the effects of different transceiver and channel parameters on the outage probability. The results are used for optimizing the transmitter laser beam radius at the waist to achieve the minimal overall outage probability in the case of different conditions over the RF part. The numerical and simulation results show that multipath fading severity and shadowing spread over the RF part have a significant effect on the optimal value of the laser beam waist and can decrease the overall outage probability for several orders of magnitude. |
| format | Article |
| id | doaj-art-d6c77743b9604d5f99b30855cd68e030 |
| institution | Kabale University |
| issn | 1943-0655 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-d6c77743b9604d5f99b30855cd68e0302025-08-20T03:32:55ZengIEEEIEEE Photonics Journal1943-06552016-01-018111410.1109/JPHOT.2016.25162507377007Outage Analysis of Mixed FSO/WiMAX LinkNemanja Zdravkovic0Milica I. Petkovic1Goran T. Djordjevic2Kimmo Kansanen3Department of Electronics and Telecommunications, Norwegian University of Science and Technology, Trondheim, NorwayDepartment of Telecommunications, Faculty of Electronic Engineering, University of Niš, Niš, SerbiaDepartment of Telecommunications, Faculty of Electronic Engineering, University of Niš, Niš, SerbiaDepartment of Electronics and Telecommunications, Norwegian University of Science and Technology, Trondheim, NorwayIn this paper, we study the outage performance of a complex system consisting of a free-space optical (FSO)/radio-frequency (RF) link. Using radio over free-space optics technology, the FSO link carries Worldwide Interoperability for Microwave Access (WiMAX) signals from a core network to a WiMAX base station, delivering traffic to multiple end RF users. A novel closed-form analytical expression for overall outage probability is derived when <inline-formula> <tex-math notation="LaTeX">$M$</tex-math></inline-formula>-ary phase-shift keying ( <inline-formula> <tex-math notation="LaTeX">$M$</tex-math></inline-formula>-PSK) and <inline-formula> <tex-math notation="LaTeX">$M$</tex-math></inline-formula>-ary quadrature amplitude modulation ( <inline-formula> <tex-math notation="LaTeX">$M$</tex-math></inline-formula>-QAM) are applied. The analysis is performed when the FSO link is under the influence of the Gamma–Gamma turbulence, path loss, and misalignment between the transmitter and receiver apertures, and the RF part is influenced by the Gamma-shadowed Nakagami- <inline-formula> <tex-math notation="LaTeX">$m$</tex-math></inline-formula> multipath fading. To illustrate the usefulness of the derived expressions, we present some numerical results that enable us to estimate the effects of different transceiver and channel parameters on the outage probability. The results are used for optimizing the transmitter laser beam radius at the waist to achieve the minimal overall outage probability in the case of different conditions over the RF part. The numerical and simulation results show that multipath fading severity and shadowing spread over the RF part have a significant effect on the optimal value of the laser beam waist and can decrease the overall outage probability for several orders of magnitude.https://ieeexplore.ieee.org/document/7377007/Atmospheric turbulencefadingfree space opticsoutage probabilitypointing errorsshadowing |
| spellingShingle | Nemanja Zdravkovic Milica I. Petkovic Goran T. Djordjevic Kimmo Kansanen Outage Analysis of Mixed FSO/WiMAX Link IEEE Photonics Journal Atmospheric turbulence fading free space optics outage probability pointing errors shadowing |
| title | Outage Analysis of Mixed FSO/WiMAX Link |
| title_full | Outage Analysis of Mixed FSO/WiMAX Link |
| title_fullStr | Outage Analysis of Mixed FSO/WiMAX Link |
| title_full_unstemmed | Outage Analysis of Mixed FSO/WiMAX Link |
| title_short | Outage Analysis of Mixed FSO/WiMAX Link |
| title_sort | outage analysis of mixed fso wimax link |
| topic | Atmospheric turbulence fading free space optics outage probability pointing errors shadowing |
| url | https://ieeexplore.ieee.org/document/7377007/ |
| work_keys_str_mv | AT nemanjazdravkovic outageanalysisofmixedfsowimaxlink AT milicaipetkovic outageanalysisofmixedfsowimaxlink AT gorantdjordjevic outageanalysisofmixedfsowimaxlink AT kimmokansanen outageanalysisofmixedfsowimaxlink |