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Future Internet 2017, 9(2), 21; doi:10.3390/fi9020021

Energy Efficient Power Allocation for the Uplink of Distributed Massive MIMO Systems

1
College of Automation and Electrical Engineering, Qingdao University, Qingdao 266071, China
2
College of Traffic and Transportation, Chongqing Jiaotong University, Chongqing 400074, China
*
Author to whom correspondence should be addressed.
Academic Editors: Luca Chiaraviglio, William Liu, Jaap Van de Beek and Filip Idzikowski
Received: 19 March 2017 / Revised: 27 May 2017 / Accepted: 2 June 2017 / Published: 9 June 2017
(This article belongs to the Special Issue Communications and Computing for Sustainable Development Goals)
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Abstract

In this paper, an energy efficient power allocation scheme is proposed for a distributed massive multiple-input multiple-output (MIMO) system with a circular antenna array. Single-antenna users simultaneously transmit signal to the base station (BS) with a large number of distributed antennas. The tight approximation of the energy efficiency (EE) is derived in closed form expressions. Through jointly optimizing the power allocation and the antenna number of BS, an NP-hard problem is formulated to maximize the EE. The equal power allocation is proved to be optimal given the total transmit power and the number of antennas. Finally, the optimal antenna number is determined by one dimension search. It is noteworthy that the NP-hard problem is solved by one dimension search. Simulation results validate the accuracy and the low-complexity of our proposed scheme. View Full-Text
Keywords: distributed antenna systems; energy efficiency; lambert-W function; massive MIMO; power allocation; spectrum efficiency distributed antenna systems; energy efficiency; lambert-W function; massive MIMO; power allocation; spectrum efficiency
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Wang, X.; Yang, Y.; Sheng, J. Energy Efficient Power Allocation for the Uplink of Distributed Massive MIMO Systems. Future Internet 2017, 9, 21.

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