Your browser does not support JavaScript!
http://iet.metastore.ingenta.com
1887

Comparison of link selection algorithms for free space optics/radio frequency hybrid network

Comparison of link selection algorithms for free space optics/radio frequency hybrid network

For access to this article, please select a purchase option:

Buy article PDF
£12.50
(plus tax if applicable)
Add to cart
Buy Knowledge Pack
10 articles for £75.00
(plus taxes if applicable)
Add to cart

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Your details
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:
 
 
 
 
 
IET Communications — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

© The Institution of Engineering and Technology
Published

The great potential of free space optics (FSO) communication motivates to use it for future requirement of high bandwidth links. However, the widespread use of this technology has been hampered by the reduced availability because of weather effects. To overcome these shortcomings a back-up link can be used so that the combined hybrid network may achieve carrier class availability. A hybrid, FSO/wireless LAN (WLAN) self-synchronising architecture is presented, which provides transparent connectivity without protocol overhead. The switching from one link to another needs efficient algorithms to achieve the optimal bandwidth utilisation while maintaining availability. Generally, the received signal strength is considered as a parameter for switching between the links. In this study, link selection has been analysed for a variety of algorithms, including filtering and hysteresis, using measured data of fog events. The combination of time and power hysteresis is found to be the optimum solution.

Inspec keywords: bandwidth allocation; optical links; wireless LAN

Other keywords: free space optics; link selection algorithms; bandwidth utilisation; radio frequency hybrid network; high bandwidth links; hybrid FSO/wireless LAN self-synchronising architecture

Subjects: Free-space optical links; Local area networks; Radio links and equipment; Computer communications

References

    1. 1)
      • Flecker, B., Gebhart, M., Leitgeb, E., Muhammad, S.S., Chlestil, C.: `Results of attenuation-measurements for optical wireless channel under dense fog conditions regarding different wavelengths', SPIE, 2006, p. 1–11.
    2. 2)
      • Rec. ITU-R P.530-12: ‘Propagation data and prediction methods required for the design of terrestrial line of sight systems’, 2007.
    3. 3)
      • Kamalakis, T., Neokosmidis, I., Tsipouras, A., Sphicopoulos, T., Pantazis, S., Andrikopoulos, I.: `Hybrid free space optical/millimeter wave outdoor links for broadband wireless access networks', PIMRC, 2005, p. 1–5.
    4. 4)
      • Abtahi, M., Rusch, L.: `Mitigating of scintillation noise in FSO communication links using saturated optical amplifiers', MILCOM, October 2006, p. 1–5.
    5. 5)
      • D.M. Forin , G. Incerti , G.M. Tosi Beleffi , A.L.J. Teixeira , L.N. Costa , P.S. De Brito Andrè . Free space optical technologies.
    6. 6)
      • S. Ajaz , E. Hasan , A. Samir , M.A. Ali . Design and performance of hybrid FSO/RF architecture for next generation broadband access networks. Proc. SPIE
    7. 7)
      • Nadeem, F., Geiger, B., Awan, M.S., Leitgeb, E., Kandus, G.: `Evaluation of switch-over methods for hybrid FSO-WLAN systems', Wireless VITAE, May 2009, Aalborg, p. 565–570.
    8. 8)
      • S. Bloom , W.S. Hartley . The last-mile solution: hybrid FSO radio.
    9. 9)
      • Nebuloni, R., Capsoni, C.: `Laser attenuation by falling snow', CSNDSP, July 2008, p. 265–269.
    10. 10)
      • Leitgeb, E., Muhammad, S.S., Chlestil, C., Gebhart, M., Birnbacher, U.: `Reliability of FSO links in next generation optical networks', ICTON, 2005, p. 394–401.
    11. 11)
    12. 12)
      • Wu, H., Hamzeh, B., Kavehrad, M.: `Achieving carrier class availability of FSO link via a complementary RF link', ACSSC, November 2004, p. 1483–1487.
    13. 13)
      • A. Acampora . Last mile by laser.
    14. 14)
      • Kvicera, V., Grabner, M., Fiser, O.: `Visibility and attenuation due to hydrometeors at 850 nm measured on an 850 m path', CSNDSP, July 2008, p. 270–272.
    15. 15)
      • Recommendation ITU-R P.1814: ‘Prediction methods required for the design of terrestrial free-space optical links’, 2007.
    16. 16)
      • Vangala, S., Pishro-Nik, H.: `Optimal hybrid RF-wireless optical communication for maximum efficiency and reliability', CISS, March 2007, p. 684–689.
    17. 17)
      • Leitgeb, E., Muhammad, S.S., Flecker, B., Chlestil, C., Gebhart, M., Javornik, T.: `The influence of dense fog on optical wireless systems, analysed by measurements in Graz for improving link-reliability', ICTON, 2006, p. 154–159.
    18. 18)
      • Pacheco de Carvalho, J., Veiga, H., Gomes, P., Reis, A.: `Experimental development and study of Wi-Fi and FSO links', CSNDSP, July 2008, p. 137–141.
    19. 19)
      • ITU: ‘Attenuation due to clouds and fog’, recommendation ITU-R P840-3, 2009.
    20. 20)
      • Nadeem, F., Geiger, B., Henkel, M.: `Switch-over implementation and analysis for hybrid wireless network of optical wireless and GHz links', WTS, April 2009, Prague, p. 1–6.
    21. 21)
      • I.I. Kim , E. Korevaar . Availability of free space optics (FSO) and hybrid FSO/RF systems.
    22. 22)
      • Milner, S.D., Davis, C.C.: `Hybrid free space optical/RF networks for tactical operations', MILCOM, 2004, p. 409–415.
    23. 23)
      • Nadeem, F., Flecker, B., Leitgeb, E., Khan, M.S., Awan, M.S., Javornik, T.: `Comparing the fog effects on hybrid networks using optical wireless and GHz links', CSNDSP, July 2008, p. 278–282.
    24. 24)
      • Akbulut, A., Ilk, H., Ari, F.: `Design, availability and reliability analysis on an experimental FSO/RF communication system', ICTON, 2005, p. 403–406.
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-com.2009.0469
Loading

Related content

content/journals/10.1049/iet-com.2009.0469
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
Print this page
This is a required field
Please enter a valid email address