Adaptive Subcarrier Allocation for Multi-User OFDM System*This paper was presented in part at IEEE Asia-Pacific Conference on Comunications (IEEE APCC) in Perth, October 2005.

Authors:
Kok Ann Donny Teo;Yoshiyuki Otani;Shuichi Ohno
Affiliations:
The authors are with the Department of Artificial Complex Systems Engineering, Graduate School of Engineering, Hiroshima University, Higashi-hiroshima-shi, 739-8527 Japan. E-mail: ohno@hiroshima-u ...;The author is with Sanyo Electric Co., Ltd., Gifu-ken, 503-0116 Japan.;The authors are with the Department of Artificial Complex Systems Engineering, Graduate School of Engineering, Hiroshima University, Higashi-hiroshima-shi, 739-8527 Japan. E-mail: ohno@hiroshima-u ...
Venue:
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Year:
2006

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Abstract

Orthogonal Frequency Division Multiple Access (OFDMA) allows multiple users to make use of the same bandwidth as the single-user OFDM for data transmission and is a promising candidate to be used for future cellular systems. A key issue at hand is the rate-adaptive resource allocation problem. In this paper, we propose two basic subcarrier allocation schemes with low complexities based on the magnitude of the channel frequency responses. The proposed algorithms ensure a fair resource allocation in terms of the number of subcarriers with affordable bit-rates. Through extensive discussions and Monte Carlo simulations, a comprehensive comparison with previously derived subcarrier allocation schemes is performed which depicts the pros and cons of our proposed algorithms.