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Energy-efficient power allocation for delay-constrained systems

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Publication date2012
Host publication2012 IEEE Global Communications Conference (GLOBECOM)
Place of PublicationNew York
PublisherIEEE
Pages3554-3559
Number of pages6
ISBN (Print)9781467309202
Original languageEnglish
EventIEEE Global Communications Conference (GLOBECOM) - Anaheim, Canada
Duration: 3/12/20127/12/2012

Conference

ConferenceIEEE Global Communications Conference (GLOBECOM)
CountryCanada
Period3/12/127/12/12

Publication series

NameIEEE Global Telecommunications Conference (Globecom)
PublisherIEEE
ISSN (Print)1930-529X

Conference

ConferenceIEEE Global Communications Conference (GLOBECOM)
CountryCanada
Period3/12/127/12/12

Abstract

In this paper, we obtain an energy-efficient power allocation technique for a Rayleigh block-fading channel with delay-limited applications. In particular, we consider a probabilistic delay constraint as the user quality-of-service (QoS) requirement, and incorporate the concept of effective capacity to obtain the maximum arrival rate, at which, the delay constraint is satisfied. We obtain the energy efficiency (EE), which is formulated as the ratio between the effective capacity and the total expenditure power, of this system and derive the power allocation strategy that maximizes the EE. Numerical results are conducted to corroborate our theoretical results. In addition, for comparison reasons, we plot the maximum achievable EE under two well-known power allocations schemes, namely, water-filling (wf) and constant power allocation (cons) when considering delay constraints. The results show that in stringent delay limited systems, adaptive power allocation improves the maximum achievable EE significantly.