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Power allocation in small cell networks with full-duplex self-backhauls and massive MIMO

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Abstract

With the dense deployment of small cell networks, low-cost backhaul schemes for small cell base stations (SBSs) have attracted great attentions. Self-backhaul using cellular communication technology is considered as a promising solution. Although some excellent works have been done on self-backhaul in small cell networks, most of them do not consider the recent advances of full-duplex (FD) and massive multiple-input and multiple-output (MIMO) technologies. In this paper, we propose a self-backhaul scheme for small cell networks by combining FD and massive MIMO technologies. In our proposed scheme, the macro base station (MBS) is equipped with massive MIMO antennas, and the SBSs have the FD communication ability. By treating the SBSs as special macro users, we can achieve the simultaneous transmissions of the access link of users and the backhaul link of SBSs in the same frequency. Furthermore, considering the existence of inter-tier and intra-tier interference, we formulate the power allocation problem of the MBS and SBSs as an optimization problem. Because the formulated power allocation problem is a non-convex problem, we transform the original problem into a difference of convex program by successive convex approximation method and variable transformation, and then solve it using a constrained concave convex procedure based iterative algorithm. Finally, extensive simulations are conducted with different system configurations to verify the effectiveness of the proposed scheme.

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Notes

  1. To simplify the network model, single-antenna SBS is assumed in this paper and the works of this paper can be expanded to small cell networks with multi-antenna SBS by involving multi-antenna channel model.

  2. The proposed FD self-backhaul scheme with massive MIMO also can be used in FDD system based on some channel estimation method [26, 27].

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Acknowledgments

This paper is jointly supported by the Hi-Tech Research and Development Program of China (National 863 Program) under Grant 2014AA01A701 and National Natural Science Foundation of China under Grant 61271182.

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Authors and Affiliations

  1. Key Laboratory of Universal Wireless Communications, Beijing University of Posts and Telecommunications, Beijing, People’s Republic of China

    Lei Chen & Hong Ji

  2. Department of Systems and Computer Engineering, Carleton University, Ottawa, ON, Canada

    F. Richard Yu

  3. Communications Research Centre, Ottawa, ON, Canada

    Bo Rong

  4. Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, BC, Canada

    Victor C. M. Leung

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  1. Lei Chen
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Correspondence to Hong Ji.

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Chen, L., Yu, F.R., Ji, H. et al. Power allocation in small cell networks with full-duplex self-backhauls and massive MIMO. Wireless Netw 24, 1083–1098 (2018). https://doi.org/10.1007/s11276-016-1381-1

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