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A real-time sub-carrier allocation scheme for multiple access downlink OFDM transmission

Authors Wong, Cheongyui
Tsui, Chi-Ying
Cheng, Roger S.K.
Ben letaief, Khaled
Issue Date 1999
Source IEEE VTS ... Vehicular Technology Conference , v. 50, (2), 1999, p. 1124-1128
Summary In this paper, we propose sub-carrier allocation algorithms for a multiple access scheme in downlink OFDM transmission. Knowing the channel characteristics of all the users at the base station, the sub-carrier allocation algorithm assigns sub-carriers to the users in a way that the total transmit power is minimized. An optimal algorithm is presented to provide the hest sub-carrier assignment. The complexity of the optimal solution renders it impractical for real-time application. To deal with the frequently changing channel characteristic of a fast time-varying multipath fading channel, a heuristic algorithm based on constructive assignment and iterative improvement is proposed which can give out a valid solution In real time. Experimental results show that the performance of this real-time algorithm is close to that of the optimal allocation. © 1999 IEEE.
ISSN 1090-3038
ISBN 0780354354
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Language English
Format Conference paper
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