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|Title: ||A real-time sub-carrier allocation scheme for multiple access downlink OFDM transmission|
|Authors: ||Wong, Cheong Yui|
Letaief, K. B.
Multipath fading channel
|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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|Appears in Collections:||ECE Conference Papers|
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