Performance improvement of FSO system using multi‐pulse pulse position modulation and SIMO under atmospheric turbulence conditions and with pointing errors
Free space optics (FSO) communication links are impaired by the fading due to turbulence and misalignment. In this paper, we theoretically analyze the pointing error effects on performance of FSO systems using multi‐pulse pulse position modulation (MP‐PPM) over the Gamma‐Gamma turbulence channel. We...
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doaj-a111ae586eb74c4482ac00a6b709d5592021-09-08T18:18:48ZengWileyIET Networks2047-49542047-49622018-07-017416517210.1049/iet-net.2017.0203Performance improvement of FSO system using multi‐pulse pulse position modulation and SIMO under atmospheric turbulence conditions and with pointing errorsTawfik Ismail0Erich Leitgeb1Zabih Ghassemlooy2Mohamed Al‐Nahhal3National Institute of Laser Enhanced Science, Cairo UniversityCairoEgyptInstitute of Microwave and Photonic Engineering, Graz University of TechnologyGrazAustriaOptical Communications Research Group, NCRLabFaculty of Engineering and EnvironmentNorthumbria UniversityNewcastleUKNational Institute of Laser Enhanced Science, Cairo UniversityCairoEgyptFree space optics (FSO) communication links are impaired by the fading due to turbulence and misalignment. In this paper, we theoretically analyze the pointing error effects on performance of FSO systems using multi‐pulse pulse position modulation (MP‐PPM) over the Gamma‐Gamma turbulence channel. We consider the moderate and strong atmospheric turbulence regimes with the combined effect of the pointing errors (PEs), and study the link average symbol error rate (ASER) and the outage probability. The numerical results are presented to show the impact of the pointing error on the ASER and the system outage. However, to overcome the channel degradation resulting from the turbulence effects and the PE, the single‐input multiple‐output (SIMO) system with maximal ratio combining (MRC) diversity is used. Exact close‐form expressions for ASER and outage probability are derived and verified by using Monte Carlo simulation. We concluded that the optimal values of the system parameters are, the transmitted power is 20 dBm, jitter variance should be less than 0.5 m and laser beam width equals 0.2 cm. These values are significantly reduced the impacts of misalignment and fading whereas outage probability is less than at maximum jitter variance.https://doi.org/10.1049/iet-net.2017.0203Gamma–Gamma turbulence channelmoderate turbulence regimesstrong atmospheric turbulence regimeslink average symbol error rateASERoutage probability |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tawfik Ismail Erich Leitgeb Zabih Ghassemlooy Mohamed Al‐Nahhal |
spellingShingle |
Tawfik Ismail Erich Leitgeb Zabih Ghassemlooy Mohamed Al‐Nahhal Performance improvement of FSO system using multi‐pulse pulse position modulation and SIMO under atmospheric turbulence conditions and with pointing errors IET Networks Gamma–Gamma turbulence channel moderate turbulence regimes strong atmospheric turbulence regimes link average symbol error rate ASER outage probability |
author_facet |
Tawfik Ismail Erich Leitgeb Zabih Ghassemlooy Mohamed Al‐Nahhal |
author_sort |
Tawfik Ismail |
title |
Performance improvement of FSO system using multi‐pulse pulse position modulation and SIMO under atmospheric turbulence conditions and with pointing errors |
title_short |
Performance improvement of FSO system using multi‐pulse pulse position modulation and SIMO under atmospheric turbulence conditions and with pointing errors |
title_full |
Performance improvement of FSO system using multi‐pulse pulse position modulation and SIMO under atmospheric turbulence conditions and with pointing errors |
title_fullStr |
Performance improvement of FSO system using multi‐pulse pulse position modulation and SIMO under atmospheric turbulence conditions and with pointing errors |
title_full_unstemmed |
Performance improvement of FSO system using multi‐pulse pulse position modulation and SIMO under atmospheric turbulence conditions and with pointing errors |
title_sort |
performance improvement of fso system using multi‐pulse pulse position modulation and simo under atmospheric turbulence conditions and with pointing errors |
publisher |
Wiley |
series |
IET Networks |
issn |
2047-4954 2047-4962 |
publishDate |
2018-07-01 |
description |
Free space optics (FSO) communication links are impaired by the fading due to turbulence and misalignment. In this paper, we theoretically analyze the pointing error effects on performance of FSO systems using multi‐pulse pulse position modulation (MP‐PPM) over the Gamma‐Gamma turbulence channel. We consider the moderate and strong atmospheric turbulence regimes with the combined effect of the pointing errors (PEs), and study the link average symbol error rate (ASER) and the outage probability. The numerical results are presented to show the impact of the pointing error on the ASER and the system outage. However, to overcome the channel degradation resulting from the turbulence effects and the PE, the single‐input multiple‐output (SIMO) system with maximal ratio combining (MRC) diversity is used. Exact close‐form expressions for ASER and outage probability are derived and verified by using Monte Carlo simulation. We concluded that the optimal values of the system parameters are, the transmitted power is 20 dBm, jitter variance should be less than 0.5 m and laser beam width equals 0.2 cm. These values are significantly reduced the impacts of misalignment and fading whereas outage probability is less than at maximum jitter variance. |
topic |
Gamma–Gamma turbulence channel moderate turbulence regimes strong atmospheric turbulence regimes link average symbol error rate ASER outage probability |
url |
https://doi.org/10.1049/iet-net.2017.0203 |
work_keys_str_mv |
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1717761963074781184 |