基于成对用户大规模MIMO两跳中继系统的最优能效设计

doi:10.11999/JEIT160245

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Abstract

The optimal system design based on maximizing the Energy Efficiency (EE) is investigated for the multi- pair massive Multiple-Input Multiple-Output (MIMO) relaying system. By virtue of the law of large numbers, an analytical expression of the involved EE function is derived with respect to the transmit power at the users and the relay, and the antenna number of the relay, when the Maximum Ratio Combining Maximum Ratio Transmission (MRC/MRT) precoding is adopted at the relay. The existences of a unique globally optimal transmit power vector and a unique globally optimal antenna number at relay are demonstrated separately by exploring the properties of the EE function. In order to obtain the optimal transmit power vector, the original fractional optimization problem is first transformed into an equivalent subtractive form by using the properties of fractional programming. Then, a low-complexity iterative algorithm is developed and the closed-form solution is deduced. Regarding the optimal number of relay antennas, a closed-form solution is also achieved by use of the Lambert W function. Numerical simulations show that the proposed power optimization algorithm converges to a near optimal solution only with a few numbers of iterations and the provided closed-form solution to the optimal number of relay antennas is also accurate.

Key words： Massive MIMO Two-hop relay Energy Efficiency (EE) Transmit power Number of antennas

Received: 17 March 2016 Published: 09 October 2016

PACS:

TN92

Fund:

The National 863 Program of China (2015AA01A703), The National Natural Science Foundation of China (61372101, 61271018, 61671144), Research Project of Jiangsu Province (BE2015156), The Natural Science Research Project of Jiangsu Province for Colleges and Universities (16KJB510008)

Corresponding Authors: WANG Yi E-mail: yiwang@seu.edu.cn

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	WANG Yi
	LIN Yan
	HUANG Yongming
	LI Chunguo
	YANG Luxi

Cite this article:

WANG Yi,LIN Yan,HUANG Yongming等. Optimal Energy-efficient Design for Two-hop Massive MIMO Relaying Systems with Multi-pair Users[J]. JEIT, 2017, 39(1): 1-8.

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http://jeit.ie.ac.cn/EN/10.11999/JEIT160245 OR http://jeit.ie.ac.cn/EN/Y2017/V39/I1/1

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