Convergence of the steepest descent method for minimizing quasiconvex functions
Journal of Optimization Theory and Applications
Energy efficient Modulation and MAC for Asymmetric RF Microsensor Systems
ISLPED '01 Proceedings of the 2001 international symposium on Low power electronics and design
Information Theory and Reliable Communication
Information Theory and Reliable Communication
Battery-Driven System Design: A New Frontier in Low Power Design
ASP-DAC '02 Proceedings of the 2002 Asia and South Pacific Design Automation Conference
Convex Optimization
Fundamentals of wireless communication
Fundamentals of wireless communication
Energy-constrained modulation optimization
IEEE Transactions on Wireless Communications
Spectral efficiency in the wideband regime
IEEE Transactions on Information Theory
Energy-efficiency of MIMO and cooperative MIMO techniques in sensor networks
IEEE Journal on Selected Areas in Communications
Low-complexity energy-efficient OFDMA
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Interference-aware energy-efficient power optimization
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Energy-efficient transmission in cognitive radio networks
CCNC'10 Proceedings of the 7th IEEE conference on Consumer communications and networking conference
Energy-efficient communication in next generation rural-area wireless networks
Proceedings of the 2010 ACM workshop on Cognitive radio networks
Cross-layer channel-aware approaches for modern wireless networks
MACOM'10 Proceedings of the Third international conference on Multiple access communications
Analysis of client relay network with opportunistic cooperation
WWIC'11 Proceedings of the 9th IFIP TC 6 international conference on Wired/wireless internet communications
Mobile Networks and Applications
Energy efficient communications for future broadband cellular networks
Computer Communications
Interference Management and Power Allocation for Energy-Efficient Cognitive Femtocell Networks
Mobile Networks and Applications
Review: Enabling Green cellular networks: A survey and outlook
Computer Communications
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Energy efficiency is becoming increasingly important for small form factor mobile devices, as battery technology has not kept up with the growing requirements stemming from ubiquitous multimedia applications. This paper addresses link adaptive transmission for maximizing energy efficiency, as measured by the "throughput per Joule" metric. In contrast to the existing water-filling power allocation schemes that maximize throughput subject to a fixed overall transmit power constraint, our scheme maximizes energy efficiency by adapting both overall transmit power and its allocation, according to the channel states and the circuit power consumed. We demonstrate the existence of a unique globally optimal link adaptation solution and develop iterative algorithms to obtain it. We further consider the special case of flat-fading channels to develop an upper bound on energy efficiency and to characterize its variation with bandwidth, channel gain and circuit power. Our results for OFDM systems demonstrate improved energy savings with energy optimal link adaptation as well as illustrate the fundamental tradeoff between energy-efficient and spectrum-efficient transmission.