[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5370/JEET.2014.9.2.721

A Fast Converged Solution for Power Allocation of OFDMA System

Hwang, Sungho (LIG Nex1 R&D Center)
Cho, Ho-Shin (School of Electronics Engineering, Kyungpook National University)

Publication Information

Journal of Electrical Engineering and Technology / v.9, no.2, 2014 , pp. 721-725 More about this Journal

Abstract

In this paper, we propose a fast adaptive power allocation method for an orthogonal frequency division multiple access (OFDMA) system that employs an adaptive modulation and coding (AMC) scheme. The proposed scheme aims to reduce the calculation complexity of greedy adaptive power allocation (APA), which is known as the optimal algorithm for maximizing the utility argument of power. Unlike greedy APA, which starts power allocation from "0", the proposed algorithm initially allocates a certain level of power determined by the water-filling scheme. We theoretically demonstrate that the proposed algorithm has almost the same capability of maximizing the utility argument as the greedy APA while reducing the number of operations by 2M, where M is the number of AMC levels.

Keywords

Adaptive power allocation; Discrete utility function; OFDMA; AMC;

Citations & Related Records

Reference

1	D. Tse, Fundamentals of Wireless Communication, Cambridge University Press, 2005.
2	G. Song, and Y. (G.) Li, "Cross-Layer Optimization for OFDM Wireless Networks-Part I: Theoretical Framework," IEEE Trans. Commun., vol. 4, no. 2, pp. 614-624, March 2005.
3	G. Song, and Y. (G.) Li, "Cross-Layer Optimization for OFDM Wireless Networks-Part II: Algorithm Development," IEEE Trans. Commun., vol. 4, no. 2, pp. 625-634, March 2005.
4	K. Kim, "Efficient Adaptive Modulation and Power Allocation Algorithm for OFDMA Cellular Systems," in Proc. 2005 Wireless Telecommunications Symposium, pp. 169-173, April 2005.
5	Y. -F. Chen, and J. -W. Chen, "A Fast Subcarrier, Bit, and Power Allocation Algorithm for Multiuser OFDM-based Systems," IEEE Trans. Veh. Tech., vol. 57, no. 2, pp. 873-881, Jan. 2008. DOI ScienceOn
6	S.H. Ali, Lee Ki-Dong, and V.C.M. Leung, "Dynamic resource allocation in OFDMA wireless metropolitan area networks," IEEE Wireless Communications, vol. 14, issue 1, Feb. 2007, pp. 6-13.