The Optimal Subchannel and Bit Allocation for Multiuser OFDM System : A Dual-Decomposition Approach 


Vol. 34,  No. 1, pp. 90-97, Jan.  2009


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  Abstract

The advantages of the orthogonal frequency division multiplexing (OFDM) are high spectral efficiency, resiliency to RF interference, and lower multi-path distortion. To further utilize vast channel capacity of the multiuser OFDM, one has to find the efficient adaptive subchannel and bit allocation among users. In this paper, we propose an 0-1 integer programming model formulating the optimal subchannel and bit allocation problem of the multiuser OFDM. We employ a dual-decomposition method that provides a tight linear programming (LP) relaxation bound. Simulation results are provided to show the effectiveness of the 0-1 integer programming model. MATLAB simulation on a system employing M-ary quardarature amplitude modulation (MQAM) assuming a frequency-selective channel consisting of three independent Rayleigh multi-paths are carried with the optimal subchannel and bit allocation solution generated by 0-1 integer programming model.

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  Cite this article

[IEEE Style]

T. Park, S. Im, M. Seo, "The Optimal Subchannel and Bit Allocation for Multiuser OFDM System : A Dual-Decomposition Approach," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 1, pp. 90-97, 2009. DOI: .

[ACM Style]

Taehyung Park, Sungbin Im, and Manjung Seo. 2009. The Optimal Subchannel and Bit Allocation for Multiuser OFDM System : A Dual-Decomposition Approach. The Journal of Korean Institute of Communications and Information Sciences, 34, 1, (2009), 90-97. DOI: .

[KICS Style]

Taehyung Park, Sungbin Im, Manjung Seo, "The Optimal Subchannel and Bit Allocation for Multiuser OFDM System : A Dual-Decomposition Approach," The Journal of Korean Institute of Communications and Information Sciences, vol. 34, no. 1, pp. 90-97, 1. 2009.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880