Energy efficient downlink MIMO transmission with linear precoding  

作　　者：XU Jie LI ShiChao QIU Ling SLIMANE Ben S. YU ChengWen 

机构地区：[1]Department of Electronic Engineering and Information Science, University of Science and Technology of China [2]Department of Communication Systems (CoS), ICT, The Royal Institute of Technology (KTH) [3]Wireless Research, Huawei Technologies Company Limited

出　　处：《Science China(Information Sciences)》2013年第2期85-96,共12页中国科学（信息科学）（英文版）

基　　金：supported by International Science and Technology Cooperation Program (Sino-Swedish Coop-erative Program 2008DFA12160);National Basic Research Program of China (Grant No. 2007CB310602);Huawei Technologies Company Limited, Shanghai, China

摘　　要：Energy efficiency （EE） is becoming increasingly important for wireless cellular networks. This paper addresses EE optimization problems in downlink multiuser MIMO systems with linear precoding. Referring to different active transmit/receive antenna sets and transmission schemes as different modes, we propose a joint bandwidth/power optimization and mode switching scheme to maximize EE. With a specific mode, we prove that the optimal bandwidth and transmit power is either full transmit power or full bandwidth. After deriving the optimal bandwidth and transmit power, we further propose mode switching to select the mode with optimal EE. Since the optimal mode switching, i.e. exhaustive search, is too complex to implement, an alternative heuristic method is developed to decrease the complexity through reducing the search size and avoiding the EE calculation during each search. Through simulations, we demonstrate that the proposed methods can significantly improve EE and the performance is similar to the optimal exhaustive search.Energy efficiency （EE） is becoming increasingly important for wireless cellular networks. This paper addresses EE optimization problems in downlink multiuser MIMO systems with linear precoding. Referring to different active transmit/receive antenna sets and transmission schemes as different modes, we propose a joint bandwidth/power optimization and mode switching scheme to maximize EE. With a specific mode, we prove that the optimal bandwidth and transmit power is either full transmit power or full bandwidth. After deriving the optimal bandwidth and transmit power, we further propose mode switching to select the mode with optimal EE. Since the optimal mode switching, i.e. exhaustive search, is too complex to implement, an alternative heuristic method is developed to decrease the complexity through reducing the search size and avoiding the EE calculation during each search. Through simulations, we demonstrate that the proposed methods can significantly improve EE and the performance is similar to the optimal exhaustive search.

关 键 词：energy efficiency downlink multiuser MIMO linear precoding bandwidth/power optimization mode switching low complexity 

分 类 号：TN919.3[电子电信—通信与信息系统]