Maximizing energy-efficiency in multi-relay OFDMA cellular networks
Maximizing energy-efficiency in multi-relay OFDMA cellular networks
This contribution presents a method of obtaining the optimal power and subcarrier allocations that maximize the energy-efficiency (EE) of a multi-user, multi-relay, orthogonal frequency division multiple access (OFDMA) cellular network. Initially, the objective function (OF) is formulated as the ratio of the spectral-efficiency (SE) over the power consumption of the network. This OF is shown to be quasi-concave, thus Dinkelbach's method can be employed for solving it as a series of parameterized concave problems. We characterize the performance of the aforementioned method by comparing the optimal solutions obtained to those found using an exhaustive search. Additionally, we explore the relationship between the achievable SE and EE in the cellular network upon increasing the number of active users. In general, increasing the number of users supported by the system benefits both the SE and EE, and higher SE values may be obtained at the cost of EE, when an increased power may be allocated.
green radio, energy efficiency, spectrum efficiency, multiple relays, OFDMA, dual decomposition, fractional programming, subcarrier/power allocation
2767-2772
Cheung, Kent Tsz Kan
2cd81603-71fa-4ef6-b859-5892fdb08bfd
Yang, Shaoshi
df1e6c38-ff3b-473e-b36b-4820db908e60
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
December 2013
Cheung, Kent Tsz Kan
2cd81603-71fa-4ef6-b859-5892fdb08bfd
Yang, Shaoshi
df1e6c38-ff3b-473e-b36b-4820db908e60
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Cheung, Kent Tsz Kan, Yang, Shaoshi and Hanzo, Lajos
(2013)
Maximizing energy-efficiency in multi-relay OFDMA cellular networks.
56th IEEE Global Communications Conference (IEEE GLOBECOM 2013), Atlanta, United States.
09 - 13 Dec 2013.
.
(doi:10.1109/GLOCOM.2013.6831493).
Record type:
Conference or Workshop Item
(Paper)
Abstract
This contribution presents a method of obtaining the optimal power and subcarrier allocations that maximize the energy-efficiency (EE) of a multi-user, multi-relay, orthogonal frequency division multiple access (OFDMA) cellular network. Initially, the objective function (OF) is formulated as the ratio of the spectral-efficiency (SE) over the power consumption of the network. This OF is shown to be quasi-concave, thus Dinkelbach's method can be employed for solving it as a series of parameterized concave problems. We characterize the performance of the aforementioned method by comparing the optimal solutions obtained to those found using an exhaustive search. Additionally, we explore the relationship between the achievable SE and EE in the cellular network upon increasing the number of active users. In general, increasing the number of users supported by the system benefits both the SE and EE, and higher SE values may be obtained at the cost of EE, when an increased power may be allocated.
More information
Published date: December 2013
Venue - Dates:
56th IEEE Global Communications Conference (IEEE GLOBECOM 2013), Atlanta, United States, 2013-12-09 - 2013-12-13
Keywords:
green radio, energy efficiency, spectrum efficiency, multiple relays, OFDMA, dual decomposition, fractional programming, subcarrier/power allocation
Organisations:
Southampton Wireless Group
Identifiers
Local EPrints ID: 351291
URI: http://eprints.soton.ac.uk/id/eprint/351291
PURE UUID: a790e925-9d66-4a4b-8763-715992e7b0cf
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Date deposited: 19 Apr 2013 08:28
Last modified: 18 Mar 2024 02:35
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Contributors
Author:
Kent Tsz Kan Cheung
Author:
Shaoshi Yang
Author:
Lajos Hanzo
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