Energy-efficient power allocation for non-regenerative OFDM relay links  

作　　者：YU Huan QIN HaoHao LI YunZhou ZHAO YiFei XU XiBin WANG Jing 

机构地区：[1]State Key Laboratory on Microwave and Digital Communications, Tsinghua National Laboratory for Information Science and Technology, Department of Electronic Engineering, Tsinghua University

出　　处：《Science China(Information Sciences)》2013年第2期52-59,共8页中国科学（信息科学）（英文版）

基　　金：supported by National Basic Research Program of China (973 Program) (Grant No. 2012CB316002);National Natural Science Foundation of China (Grant No. 61021001);National High-tech R&D Program of China(863 Program) (Research on the Key Technology of Green Networks);State Key Laboratory of Wireless Mobile Communications (CATT) and National S&T Major Project (Grant No. 2010ZX03005-001)

摘　　要：We consider a two-hop non-regenerative （amplify-and-forward） relay link with one source, one destination and one relay, in which orthogonal frequency division multiplexing （OFDM） is used. The power allocation （PA） to maximize the energy efficiency for the whole link is investigated under quality of service （Qos） require- ment and separate power constraints. An approximation method with low complexity is first proposed to convert the PA problem into a quasi-concave problem, which can obtain a tight lower bound in high SNR region. Furthermore, a more accurate approximation method with higher complexity is raised, which can approach the actual performance both in the low SNR and high SNR regions. We also introduce subcarrier pairing scheme to further enhance the energy efficiency for the link. Simulation results are shown to compare the performance of the two proposed methods.We consider a two-hop non-regenerative （amplify-and-forward） relay link with one source, one destination and one relay, in which orthogonal frequency division multiplexing （OFDM） is used. The power allocation （PA） to maximize the energy efficiency for the whole link is investigated under quality of service （Qos） require- ment and separate power constraints. An approximation method with low complexity is first proposed to convert the PA problem into a quasi-concave problem, which can obtain a tight lower bound in high SNR region. Furthermore, a more accurate approximation method with higher complexity is raised, which can approach the actual performance both in the low SNR and high SNR regions. We also introduce subcarrier pairing scheme to further enhance the energy efficiency for the link. Simulation results are shown to compare the performance of the two proposed methods.

关 键 词：energy efficiency power allocation OFDM RELAY cooperative communication 

分 类 号：TN919.3[电子电信—通信与信息系统]