Paper Info
Title
Fast optimal energy-efficient resource allocation for downlink multi-user OFDM systems
Abstract
In this paper, we propose an optimal resource allocation algorithm that maximizes the energy efficiency (EE) of a downlink (DL) multi-user orthogonal frequency division multiplexing (OFDM) system subject to a constraint on the total transmit power of the base station (BS). We show that the optimal EE is obtained by first allocating each subcarrier to the user equipment (UE) with the best channel power gain and then adapting the transmit power for each subcarrier using water-filling (WF) policy. Moreover, we propose a fast algorithm with linear complexity to compute the optimal WF level. We perform simulations to illustrate the effectiveness of the proposed algorithm and investigate the impact of maximum transmit power on the optimal EE. Simulation results indicate that an energy-efficient system behaves like a spectral-efficient system when the maximum transmit power of the BS is set to lower values.
Year
DOI
Venue
2013
10.1109/PIMRC.2013.6666411
PIMRC
Keywords
Field
DocType
resource allocation,ofdm modulation
Subcarrier,Base station,Transmitter power output,Efficient energy use,Computer science,Real-time computing,Resource allocation,User equipment,Orthogonal frequency-division multiplexing,Telecommunications link
Conference
ISSN
Citations 
PageRank 
2166-9570
1
0.36
References 
Authors
8
3
Name
Order
Citations
PageRank
Suman Khakurel11095.30
Christopher Leung2202.74
Tho Le-Ngoc32210237.14