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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© 2009 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering
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Fan, X., Jintao, C. (2009). Performance of Adaptive Sub-carrier and Bit Allocation Algorithms for Multi-user OFDM Wireless Systems. In: Wang, C. (eds) AccessNets. AccessNets 2008. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 6. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-04648-3_23
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DOI: https://doi.org/10.1007/978-3-642-04648-3_23
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