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On relay selection and power allocation in cooperative free-space optical networks

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Abstract

Drawing increasing attention, free-space optics (FSO) is a cost-effective technology to support data intensive communications. Cooperative diversity is considered to be an effective means for combating weather turbulence in FSO networks. In this paper, we consider the challenging problem of joint relay selection and power allocation in FSO networks. The objective was to maximize the FSO network-wide throughput under constraints of a given power budget and a limited number of FSO transceivers. The problem is formulated as a mixed integer nonlinear programming (MINLP) problem, which is NP-hard. We first adopt the reformulation-linearization technique (RLT) to derive an upper bound for the original MINLP problem. Due to the relaxation, the solutions obtained from RLT are infeasible. We then propose both centralized and distributed algorithms using bipartite matching and convex optimization to obtain highly competitive solutions. The proposed algorithms are shown to outperform the noncooperative scheme and an existing relay selection protocol with considerable gains through simulations.

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Acknowledgments

This work is supported in part by the US National Science Foundation (NSF) under Grants CNS-1145446 and CNS-1320664, and through the NSF Broadband Wireless Access & Applications Center (BWAC) site at Auburn University. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the foundation.

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Authors and Affiliations

  1. Department of Electrical and Computer Engineering, Auburn University, Auburn, AL, 36849-5201, USA

    Hui Zhou, Shiwen Mao & Prathima Agrawal

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  1. Hui Zhou
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  2. Shiwen Mao
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  3. Prathima Agrawal
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Correspondence to Shiwen Mao.

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Zhou, H., Mao, S. & Agrawal, P. On relay selection and power allocation in cooperative free-space optical networks. Photon Netw Commun 29, 1–11 (2015). https://doi.org/10.1007/s11107-014-0465-z

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