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Title: A real-time sub-carrier allocation scheme for multiple access downlink OFDM transmission
Authors: Wong, Cheong Yui
Tsui, Chi-Ying
Cheng, Roger
Letaief, K. B.
Keywords: OFDM
Sub-carrier allocation
Multipath fading channel
Multiple access
Issue Date: Sep-1999
Citation: VTC 1999 - Fall. 1999 IEEE 50th Vehicular Technology Conference, Amesterdam, 19-22 September 1999, vol. 2, p. 1124-1128
Abstract: 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 best 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.
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