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Title: Multiuser OFDM with adaptive sub-carrier, bit, and power allocation
Authors: Wong, Cheong Yui
Cheng, Roger
Letaief, K. B.
Murch, Ross David
Keywords: OFDM
Adaptive modulation
Multiaccess communication
Multiuser channel
Frequency selective fading channel
Resource management
Issue Date: Oct-1999
Citation: IEEE journal on selected areas in communications, v. 17, no. 10, October 1999, p. 1747-1758
Abstract: Multiuser Orthogonal Frequency Division Multiplexing (OFDM) with adaptive multiuser sub-carrier allocation and adaptive modulation is considered. Assuming knowledge of the instantaneous channel gains for all users, we propose a multiuser OFDM sub-carrier, bit, and power allocation algorithm to minimize the total transmit power. This is done by assigning, to each user, a set of sub-carriers, and by determining, for each sub-carrier, the number of bits and the transmit power level. We obtain the performance of our proposed algorithm in a multiuser frequency selective fading environment for various time delay spread values and various numbers of users. The results show that our proposed algorithm outperforms multiuser OFDM systems with static TDMA or FDMA techniques which employ fixed and pre-determined time-slot or sub-carrier allocation schemes. We have also quantified the improvement in terms of the overall required transmit power, the bit error rate, or the area of coverage for a given outage probability.
Rights: © 1999 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
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