Energy Efficiency Contours for Broadcast Channels Using Realistic Power Models
Akbari, A, Heliot, F, Imran, MA and Tafazolli, R (2012) Energy Efficiency Contours for Broadcast Channels Using Realistic Power Models IEEE Transactions on Wireless Communications, 11 (11). 4017 - 4025. ISSN 1536-1276
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Official URL: http://dx.doi.org/10.1109/TWC.2012.112207
Energy savings are becoming a global trend, hence the importance of energy efficiency (EE) as an alternative performance evaluation metric. This paper proposes an EE based resource allocation method for the broadcast channel (BC), where a linear power model is used to characterize the power consumed at the base station (BS). Having formulated our EE based optimization problem and objective function, we utilize standard convex optimization techniques to show the concavity of the latter, and thus, the existence of a unique globally optimal energy-efficient rate and power allocation. Our EE based resource allocation framework is also extended to incorporate fairness, and provide a minimum user satisfaction in terms of spectral efficiency (SE). We then derive the generic equation of the EE contours and use them to get insights about the EE-SE trade-off over the BC. The performances of the aforementioned resource allocation schemes are compared for different metrics against the number of users and cell radius. Results indicate that the highest EE improvement is achieved by using the unconstrained optimization scheme, which is obtained by significantly reducing the total transmit power. Moreover, the network EE is shown to increase with the number of users and decrease as the cell radius increases.
|Additional Information:||This is an author version of an article accepted for publication in IEEE Transactions on Wireless Communications. Copyright 2012 IEEE.|
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|Divisions:||Faculty of Engineering and Physical Sciences > Electronic Engineering > Centre for Communication Systems Research|
|Deposited By:||Symplectic Elements|
|Deposited On:||09 Oct 2012 14:34|
|Last Modified:||13 Jun 2013 14:49|
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