Journal of Beijing University of Posts and Telecommunications

  • EI核心期刊

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2013, Vol. 36 ›› Issue (4): 39-43.doi: 10.13190/jbupt.201304.36.zhaol

• Papers • Previous Articles     Next Articles

Optimal Energy Efficient Power Allocation for Downlink MIMO System

ZHAO Long, LONG Hang, ZHAO Hui, ZHENG Kan, WANG Wen-bo   

  1. Key Laboratory of Universal Wireless Communication (Beijing University of Posts and Telecommunications), Ministry of Education, Beijing 100876, China
  • Received:2012-11-15 Online:2013-08-31 Published:2013-05-22

Abstract:

In order to decrease the carbon emission and operator expenditure induced by energy consumption of wireless communication networks, a power allocation scheme achieving optimal energy efficiency is proposed for downlink multiple-input multiple-output system. An energy efficient model is formulated based on realistic power consumption model and beam forming. The existence of unique globally optimal energy efficiency is proved, and the closed-from of the optimal energy efficiency is derived depending on channel state information. Based on the closed-form result, an iterative algorithm achieving optimal energy efficiency adaptively is developed. Simulation shows that the proposed scheme can improve the energy efficiency and spectrum efficiency. Meanwhile, increasing the number of antennas and shrinking cell radius are two important measures to enhance the energy efficiency and the spectrum efficiency.

Key words: multiple-input multiple-output system, energy efficiency, spectrum efficiency, power allocation

CLC Number: