Relay Placement for FSO Multihop DF Systems With Link Obstacles and Infeasible Regions

Type
Article

Authors
Zhu, Bingcheng
Cheng, Julian
Alouini, Mohamed-Slim
Wu, Lenan

KAUST Department
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program

Online Publication Date
2015-05-19

Print Publication Date
2015-09

Date
2015-05-19

Abstract
Optimal relay placement is studied for free-space optical multihop communication with link obstacles and infeasible regions. An optimal relay placement scheme is proposed to achieve the lowest outage probability, enable the links to bypass obstacles of various geometric shapes, and place the relay nodes in specified available regions. When the number of relay nodes is large, the searching space can grow exponentially, and thus, a grouping optimization technique is proposed to reduce the searching time. We numerically demonstrate that the grouping optimization can provide suboptimal solutions close to the optimal solutions, but the average searching time linearly grows with the number of relay nodes. Two useful theorems are presented to reveal insights into the optimal relay locations. Simulation results show that our proposed optimization framework can effectively provide desirable solution to the problem of optimal relay nodes placement. © 2015 IEEE.

Citation
Zhu B, Cheng J, Alouini M-S, Wu L (2015) Relay Placement for FSO Multihop DF Systems With Link Obstacles and Infeasible Regions. IEEE Transactions on Wireless Communications 14: 5240–5250. Available: http://dx.doi.org/10.1109/TWC.2015.2434945.

Acknowledgements
This research is supported by an NSERC Discovery Grant. The associate editor coordinating the review of this paper and approving it for publication was N. C. Sagias.

Publisher
Institute of Electrical and Electronics Engineers (IEEE)

Journal
IEEE Transactions on Wireless Communications

DOI
10.1109/TWC.2015.2434945

Additional Links
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=7110383

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