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Interference Alignment in Relay-Aided Networks with Imperfect CSIT

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Abstract

In this paper, a relay-aided interference alignment (RIA) strategy was considered based on the benefits offered by relay-based cooperative networks. Along with the benefits offered by cooperative networks, the RIA was shown as a practical solution for a K-user BC network. The relationship between the achievable DoF region of the RIA and the different levels of outdated channel state information (CSI) were derived. The trade-off between the NRIA and RIA were analysed and the specific trade-off region in each outdated CSI assumption was indicated in the numerical results. Through the achievable DoF numerical results, it was recognised that regarding achievable DoF, the RIA outperforms the NRIA in most of the outdated CSI scenarios.

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Acknowledgements

This work was supported in part by the Natural Science Foundation of Fujian Province, China, under Grant 2019J01874, in part by the Xiamen Scientific Research Start-up Foundation for the Returned Overseas Chinese Scholars, China, under Grant C2018057.

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Authors and Affiliations

  1. Fujian Key Laboratory of Communication Network and Information Processing, School of Opto-Electronic and Communication Engineering, Xiamen University of Technology, Li Gong Rd. No.600, Xiamen, 361024, China

    Yue Tian

  2. CSN Research Group, University of Bristol, Bristol, UK

    Yue Tian

  3. School of Information Engineering, Zhengzhou University, Zhengzhou, China

    Zhanwei Wang

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  1. Yue Tian
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  2. Zhanwei Wang
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Correspondence to Yue Tian.

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Tian, Y., Wang, Z. Interference Alignment in Relay-Aided Networks with Imperfect CSIT. Wireless Pers Commun 114, 1085–1105 (2020). https://doi.org/10.1007/s11277-020-07410-2

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