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Joint user selection and power allocation optimization for energy-efficient MU-MIMO systems with limited feedback

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Abstract

The multi-user multiple-input multiple-output (MU-MIMO) systems can greatly improve the system throughput. An efficient user selection and power allocation schemes are essential to achieve the needed performance. This paper examines energy efficiency maximization under limited feedback in MU-MIMO systems. An expression for the achievable data rate is derived for RRH-user selection which is used to obtain the optimization framework for the energy efficiency (EE). The system EE is optimized through power allocation, RRH-user selection and number of antennas adjustment when the quality of service requirements and maximum transmit power constraints are satisfied. The formulated problem is NP-hard and non-convex. Based on Lagrange dual decomposition and successive convex approximation, a practical scheme is proposed to tackle the problem. It can be observed that there is an improvement of 4% in the energy efficiency of the proposed algorithm as compared with the energy efficiency of the existing algorithm. Furthermore, the computational complexity of the proposed algorithm is discussed. Finally, the proposed algorithm is validated through simulations and the results show that the proposed algorithm outperforms the existing algorithms in terms of the system EE.

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Acknowledgements

This work was supported in part by the National Natural Science Foundation of China under Grant 62071244, in part by the Key Technologies R&D Program of Jiangsu Province under Grant BE2018733.

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Authors and Affiliations

  1. Jiangsu Engineering Research Center of Communication and Network Technology, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Kusi Ankrah Bonsu, Su Pan & Weiwei Zhou

  2. Department of Internet of Things Engineering, Hohai University, Changzhou, 213022, China

    James Adu Ansere

  3. School of Electrical and Data Engineering, University of Technology Sydney, Sydney, 2007, Australia

    Weiwei Zhou

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  1. Kusi Ankrah Bonsu
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  2. Su Pan
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Correspondence to Su Pan.

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Bonsu, K.A., Pan, S., Ansere, J.A. et al. Joint user selection and power allocation optimization for energy-efficient MU-MIMO systems with limited feedback. Telecommun Syst 77, 479–492 (2021). https://doi.org/10.1007/s11235-021-00765-2

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