Research Article
Performance of Adaptive Sub-carrier and Bit Allocation Algorithms for Multi-user OFDM Wireless Systems
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@INPROCEEDINGS{10.1007/978-3-642-04648-3_23, author={Xiangning Fan and Chu Jintao}, title={Performance of Adaptive Sub-carrier and Bit Allocation Algorithms for Multi-user OFDM Wireless Systems}, proceedings={AccessNets. Third International Conference on Access Networks, AccessNets 2008, Las Vegas, NV, USA, October 15-17, 2008. Revised Papers}, proceedings_a={ACCESSNETS}, year={2012}, month={5}, keywords={OFDM OFDMA bit loading sub-carrier allocation multi-user}, doi={10.1007/978-3-642-04648-3_23} }- Xiangning Fan
Chu Jintao
Year: 2012
Performance of Adaptive Sub-carrier and Bit Allocation Algorithms for Multi-user OFDM Wireless Systems
ACCESSNETS
Springer
DOI: 10.1007/978-3-642-04648-3_23
Abstract
Multi-user orthogonal frequency division multiplexing (OFDM) with adaptive sub-carrier and bit allocation are considered in this paper. Assuming having the knowledge of the instantaneous users’ channel gains, three typical dynamic sub-carrier and bit allocation algorithms are analyzed and compared. The goal of each algorithm is to minimize the total transmit power with the user’s data rate constraint. Then, based on the comparison, an improvement method is proposed for Zhang algorithm. Finally, performance comparisons between adaptive schemes and static ones are given. The results prove that the performances of adaptive algorithms are much better than that of the traditional fixed sub-carrier allocation method.
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