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On the Performance of Cellular Two-Way Relay Systems with Analog Network Coding and Multiuser Diversity

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Abstract

We consider a cellular two-way relaying system in which a multi-antenna base station (BS) communicates bidirectionally with one of several single-antenna mobile stations (MSs) via a single-antenna relay using analog network coding. We employ MS selection coupled with beamforming at the BS so as to maximize the end-to-end signal-to-noise ratios. In the considered system, the target rates at the sources can generally be different owing to the asymmetric traffic flow in opposite directions. With such a general setup, we perform an overall system outage probability analysis over Rayleigh fading channels. For more insights, we derive a closed-form asymptotic expression for overall outage probability and an upper bound expression for ergodic sum-rate of the system. Based on these expressions, we show that the system achieves a performance gain, and a diversity order of minimum of the number of BS antennas and the number of MSs. Moreover, we address the problem of optimization of relay location in order to minimize the overall system outage under asymmetric traffic conditions. Finally, we provide numerical and simulation results to corroborate the theoretical analysis and the advantages offered by the proposed scheme.

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Authors and Affiliations

  1. Discipline of Electrical Engineering, Indian Institute of Technology Indore, Indore, 452017, MP, India

    Prabhat K. Upadhyay & Suneel Yadav

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  1. Prabhat K. Upadhyay
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  2. Suneel Yadav
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Correspondence to Prabhat K. Upadhyay.

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Upadhyay, P.K., Yadav, S. On the Performance of Cellular Two-Way Relay Systems with Analog Network Coding and Multiuser Diversity. Wireless Pers Commun 72, 2705–2720 (2013). https://doi.org/10.1007/s11277-013-1175-z

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