NDLI: Adaptive Subcarrier Allocation Algorithms in Wireless OFDMA Systems

Content Provider	IEEE Xplore Digital Library
Author	Marabissi, D. Tarchi, D. Fantacci, R. Biagioni, A.
Copyright Year	2008
Description	Author affiliation: Dept. of Electron. & Telecommun., Univ. of Florence, Florence (Marabissi, D.; Tarchi, D.; Fantacci, R.; Biagioni, A.)
Abstract	WiMAX is one of the most important technologies for providing a Broadband Wireless Access (BWA) in a metropolitan area. The use of OFDM transmission has been proposed to reduce the effect of multipath fading in wireless communications; moreover, multiple access is achieved by resorting to the use of OFDMA. Adaptive subcarrier allocation techniques have been selected to exploit the multiuser diversity, leading to an improvement of performances by assigning subchannels to the users accordingly with their channel responses. In this paper, three adaptive subcarrier allocation algorithms have been proposed; they are based on channel capacity and aim to assign an equal amount of capacity to all the users or to distribute the capacity proportionally to the users' channel conditions. The algorithms performances have been valued and compared in terms of bit error rate and throughput. The proposed strategies show a substantial improvement with respect to a static allocation, turning the multiuser diversity into a significant increase of data rate.
Starting Page	3475
Ending Page	3479
File Size	130326
Page Count	5
File Format	PDF
ISBN	9781424420759
DOI	10.1109/ICC.2008.653
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-19
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Wireless communication Radio spectrum management Frequency diversity Fading Channel capacity Downlink Frequency estimation Media Access Protocol Frequency conversion
Content Type	Text
Resource Type	Article

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