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Mathematical Problems in Engineering
Volume 2013, Article ID 613470, 7 pages
Research Article

Chunk-Based Energy Efficient Resource Allocation in OFDMA Systems

1The Institute of Embedded Software and Systems, Beijing University of Technology, Beijing 100022, China
2Department of Vehicle Information Systems, North Information Control Group Co., Ltd., Guangzhou 510220, China
3Department of Physical, Shunde High School, Foshan 528300, China
4Department of National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu 610054, China

Received 22 August 2013; Revised 2 November 2013; Accepted 6 November 2013

Academic Editor: Zhan Shu

Copyright © 2013 Yong Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Energy efficiency (EE) capacity analysis of the chunk-based resource allocation is presented by considering the minimum spectrum efficiency (SE) constraint in downlink multiuser orthogonal frequency division multiplexing (OFDM) systems. Considering the minimum SE requirement, an optimization problem to maximize EE with limited transmit power is formulated over frequency selective channels. Based on this model, a low-complexity energy efficient resource allocation is proposed. The effects of system parameters, such as the average channel gain-to-noise ratio (CNR) and the number of subcarriers per chunk, are evaluated. Numerical results demonstrate the effectiveness of the proposed scheme for balancing the EE and SE.