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A Simple Resource Allocation Scheme for Throughput Enhancement in Relay Based OFDMA Cellular Systems  

Oh, Eun-Sung (School of Electrical and Electronic Eng., Yonsei University)
Ju, Hyung-Sik (School of Electrical and Electronic Eng., Yonsei University)
Han, Seung-Youp (School of Electrical and Electronic Eng., Yonsei University)
Hong, Dae-Sik (School of Electrical and Electronic Eng., Yonsei University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.46, no.9, 2009 , pp. 24-30 More about this Journal
Abstract
This paper presents a simple resource allocation scheme for throughput enhancement in relay based orthogonal frequency division multiple access (OFDMA) cellular systems. The resource allocation schemes, which are based on the optimization problem, have high computational complexity. That is why a searching process is required on the overall allocable resources. Since these schemes should be performed in real time, we propose a simple resource allocation scheme which has very low computational complexity. Firstly, we formulate the optimization problem and draw observations for throughput maximization. Based on observations, we propose a three step allocation scheme that separates the allocable resources into three (i.e. relay, frequency and time). By doing so, the computational complexity can be reduced. Simulation results show that the proposed scheme has near-optimum performance in spite of its low computational complexity.
Keywords
Resource allocation; relay system; orthogonal frequency division multiple access (OFDMA);
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