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Resource Allocation in RelayBased OFDM Networks with Proportional Fairness
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WU Youlong1,LUO Hanwen1,LIU Wei1,WANG Hailong2,ZHOU Xiaolin3
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(1.School of Electronic, Information and Electric Engineering, Shanghai Jiaotong University,Shanghai 200240, China； 2.Leadcore Technology Co. Ltd, Shanghai 200233, China;3.Department of Communication Science and Engineering, Fudan University, Shanghai 200433, China)
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Abstract A new scheme was proposed which adaptively allocates the resource in the downlink scenario of a cellular cooperative frequencydivision multiplexing (OFDM) networks. The allocation scheme mainly contains the subcarrier and power allocation both in base station and relay nodes. Two algorithms, strict rate proportional fairness and relaxed subcarrier proportional fairness, for subcarrier allocation were proposed. The first one aims to achieve perfect rate proportional among users, allocates the best subcarrier to the user with worst rate proportional fairness; the second one relaxes the rate proportional fairness into subcarrier proportional fairness so that it can avoid too many subcarriers being allocated to the user with bad channel gains. After the subcarrier allocation, power allocation based on waterfilling algorithm was employed to improve the throughput. The simulation results and analysis show that, both of the proposed algorithms can substantially increase the throughput, and achieve a fine proportional fairness.
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Received: 08 November 2009
Published: 28 September 2010
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