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Practical Coarse Relay Site Planning: Performance Analysis Over Composite Fading/Shadowing Channels

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Abstract

Relay deployments promise to alleviate the limitations of conventional macrocell networks, such as poor indoor penetration and coverage holes in a cost-efficient way. In this context, the capacity of the wireless relay link between a relay node (RN) and its serving base station has a crucial impact on the end-to-end performance. The deployment flexibility of RNs, which mainly stems from the wireless relay link, compact physical characteristics, and low-power consumption, can be exploited by relay site planning (RSP) to overcome the limitations of the relay link and, thus, enhance the system performance. To this end, RSP is carried out via selecting an RN deployment location from a discrete set of alternatives considering the signal-to-interference-plus-noise ratio (SINR) on the relay link as the selection criterion. In practice, the so-called coarse RSP takes into account only large-scale fading due to shadowing. Nevertheless, as RNs are stationary, the wireless channels pertaining to relay deployments are subject to simultaneous impairments by both shadowing and multi-path fading, i.e., composite fading/shadowing. In this paper, we present the performance of coarse RSP that can be used for planning and dimensioning of two-hop cellular relay networks in composite fading/shadowing environments, where co-channel interference is also present. The relay link is modeled by Nakagami-lognormal distribution while the access link between a mobile terminal and its serving RN is modeled by Rician-lognormal distribution. Further, we provide an accurate analytical framework through closed-form expressions for relay link SINR, link rates, and end-to-end rate. Results show that coarse RSP can still yield high performance improvements in terms of both SINR and rate considering composite fading/shadowing channels. Moreover, coarse RSP is shown to effectively decrease the amount of fading on the relay link and, thus, mitigate the detrimental effects of composite fading/shadowing.

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Notes

  1. Part of this work was presented at the 2013 IEEE Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) [15]. In addition to [15], this paper provides a comprehensive analysis and new extensive results.

  2. The abscissas and weight factors can be also generated via various online tools like in [29] for \(N\) up to 100.

  3. Recall that the variables \(\left\{ \widetilde{\varUpsilon }_{m,k}:m\ne n\right\} \) are assumed to be independent based on the discussion in Sect. 3.2.2 where uncorrelated shadowing is assumed among the different candidate RN locations.

  4. MATLAB is utilized in AoF evaluations after RSP.

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Acknowledgments

Part of this work has been performed in the framework of the FP7 project ICT-317669 METIS, which is partly funded by the European Union. The authors would like to acknowledge the contributions of their colleagues in METIS, although the views expressed are those of the authors and do not necessarily represent the project. This work was supported in part by Academy of Finland (Grant 254299).

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Authors and Affiliations

  1. Huawei European Research Center, Riesstrasse 25C, 80992, Munich, Germany

    Ömer Bulakci & Egon Schulz

  2. Department of Communications and Networking, Aalto University School of Electrical Engineering, P.O.Box 13000, 00076, Espoo, Finland

    Jyri Hämäläinen

Authors
  1. Ömer Bulakci
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  3. Egon Schulz
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Correspondence to Ömer Bulakci.

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Bulakci, Ö., Hämäläinen, J. & Schulz, E. Practical Coarse Relay Site Planning: Performance Analysis Over Composite Fading/Shadowing Channels. Int J Wireless Inf Networks 21, 249–261 (2014). https://doi.org/10.1007/s10776-014-0254-8

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