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| A Low Complexity Resource Allocation Scheme with Proportional Fairness for MIMO-OFDMA System |
| Du Na①; Gu Pin-biao②; Min Rui②③; Cao Ning① |
①Computer & Information Engineering College, Hohai University, Nanjing 210098, China;
②School of Information Science and Engineering, Southeast University, Nanjing 210096, China; ③Institute of Science, PLA University of Science & Technology, Nanjing 211101, China |
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Abstract This paper presents a new scheme based on proportional fairness for MIMO-OFDM downlink resource allocation to maximize the sum of user data rates, subject to constraints on total power, bit error rate, and proportionality among user data rates. This new scheme embraces the ability to simultaneously exploit space, frequency and multi-user diversity to improve spectrum efficiency. Based on MIMO channel state information, eigen-channels are intelligently used to determine subcarrier allocation and power allocation, which forms the foundation of the new scheme. A linear non-iterative power allocation method with low complexity is deduced that is made by the relaxation of strict user rate proportionality constraints. Simulation results show that this new adaptive allocation scheme can achieve good tradeoff between capacity and fairness, while requiring significantly less computation.
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Received: 03 June 2008
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Corresponding Authors:
Du Na
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2010, Vol. 32 
