Paper Info
Title
Energy efficiency tradeoff in downlink and uplink TDD OFDMA with simultaneous wireless information and power transfer
Abstract
Energy-efficient design in orthogonal frequency division multiple access (OFDMA) is becoming increasingly important, considering the booming energy consumption in wireless networks and the extensive deployment of OFDMA-based wireless infrastructures. On the other hand, wireless power transfer brings another promising approach for saving energy and prolonging lifetime in wireless networks by letting users scavenge energy from the received radio-frequency (RF) signals all over the wireless environments, including the desired information beams and undesired interference beams. In this paper, we study the downlink and uplink energy efficiency (EE) tradeoff in time-division duplexing (TDD) OFDMA with one access point (AP) and multiple users, where the users are allowed to split the received signals for decoding information and harvesting energy in the downlink, respectively. The established optimization problem turns to be an integer-mixed nonconvex program. Through relaxation and transformation, we develop a near-optimal resource allocation strategy that approaches the Pareto optimal tradeoff performance. Numerical results show that there may exist a tradeoff between the downlink and uplink EE and the AP can help improve the uplink EE by operating the downlink at the suboptimal EE regime.
Year
DOI
Venue
2014
10.1109/ICC.2014.6884177
ICC
Keywords
Field
DocType
uplink tdd ofdma,wireless power transfer,energy efficiency tradeoff,simultaneous information and power transfer,orthogonal frequency division multiple access,time division multiplexing,inductive power transmission,ofdm modulation,downlink tdd ofdma,energy conservation,telecommunication power management,time division duplexing,integer mixed nonconvex program,time-division duplexing (tdd),optimization problem,energy harvesting,wireless information,orthogonal frequency division multiple access (ofdma),radiofrequency signals,access point,energy consumption,near optimal resource allocation strategy,energy efficiency (ee) tradeoff,pareto optimal tradeoff performance,ofdm,uplink,tin,wireless communication,downlink
Wireless,Computer science,Efficient energy use,Computer network,Real-time computing,Maximum power transfer theorem,Telecommunications link
Conference
ISSN
Citations 
PageRank 
1550-3607
9
0.51
References 
Authors
14
3
Name
Order
Citations
PageRank
Cong Xiong168133.25
Lu Lu224813.64
Geoffrey Ye Li39071660.27