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Appl. Sci. 2017, 7(7), 709; doi:10.3390/app7070709

Transmission Power Determination Based on Power Amplifier Operations in Large-Scale MIMO-OFDM Systems

1
School of Intelligent Mechatronics Engineering, Sejong University, Seoul 05006, Korea
2
Departmemt of Electronic Engineering, Kwangwoon University, Seoul 01897, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Christos Bouras
Received: 29 April 2017 / Revised: 22 June 2017 / Accepted: 7 July 2017 / Published: 9 July 2017
(This article belongs to the Section Computer Science and Electrical Engineering)
View Full-Text   |   Download PDF [1139 KB, uploaded 9 July 2017]   |  

Abstract

This paper presents a method to determine transmission power based on power amplifier (PA) operations in order to improve the energy efficiency (EE) of a large-scale (LS) Multiple Input Multiple Output (MIMO)-OFDM system, which is a multi-carrier multiple antenna system with a large amount of transmitter (TX) antennas. Regarding the EE improvement, we propose two kinds of PA operation schemes: increasing the effective TX power (ITXP) and reducing the PA power consumption (RPC) assuming that a reduction of peak-to-average power ratio is applied in the appropriate manner. Closed-form expressions of relative EE are derived for both schemes, and the relative EE of the ITXP scheme is shown to depend on the precoding method that is applied to reduce the inter-user interference, while that of the RPC scheme is independent of the precoding method. The relative EE difference between the ITXP and the RPC schemes is also shown to rely on the occupation ratio of the PA power consumption over the total power consumption. Thus, the EE can remarkably improve by selecting the appropriate scheme based on the circumstances. The results of a simulation also validate the derived closed-form expression of the relative EE. View Full-Text
Keywords: antenna; large-scale MIMO; energy efficiency; power amplifier antenna; large-scale MIMO; energy efficiency; power amplifier
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MDPI and ACS Style

Lee, B.M.; Kim, Y. Transmission Power Determination Based on Power Amplifier Operations in Large-Scale MIMO-OFDM Systems. Appl. Sci. 2017, 7, 709.

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