A sub-optimal joint subcarrier and power allocation algorithm for multiuser OFDM

This paper investigates subcarrier and power allocation in multiuser OFDM. The aim is to maximize the overall rate while achieving proportional fairness amongst users under a total power constraint. Achieving the optimal solution is computationally demanding thereby necessitating the use of sub-optimal techniques. Existing sub-optimal techniques either use fixed power allocation and perform only subcarrier allocation or handle subcarrier and power allocation separately. In this paper, we propose an algorithm that performs joint subcarrier and power allocation. Simulation results are shown to compare the performance of the proposed algorithm with that of existing algorithms.

[1]  Eric Lawrey.  Multiuser OFDM , 1999, ISSPA '99. Proceedings of the Fifth International Symposium on Signal Processing and its Applications (IEEE Cat. No.99EX359).

[2]  Douglas L. Jones,et al.  Computationally efficient optimal power allocation algorithms for multicarrier communication systems , 2000, IEEE Trans. Commun..

[3]  Khaled Ben Letaief,et al.  Multiuser OFDM with adaptive subcarrier, bit, and power allocation , 1999, IEEE J. Sel. Areas Commun..

[4]  D. A. Bell,et al.  Information Theory and Reliable Communication , 1969 .

[5]  J. Andrews,et al.  Adaptive Resource Allocation in Multiuser OFDM Systems with Proportional Fairness , 2004 .

[6]  John M. Cioffi,et al.  Increase in capacity of multiuser OFDM system using dynamic subchannel allocation , 2000, VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026).

[7]  Kwang Bok Lee,et al.  Transmit power adaptation for multiuser OFDM systems , 2003, IEEE J. Sel. Areas Commun..

[8]  Jeffrey G. Andrews,et al.  Adaptive resource allocation in multiuser OFDM systems with proportional rate constraints , 2005, IEEE Transactions on Wireless Communications.

[9]  Kung Yao,et al.  Channel Estimation and Optimal Power Allocation for a Multiple-Antenna OFDM System , 2002, EURASIP J. Adv. Signal Process..