A Computationally-Efficient Adaptive Resource Allocation Algorithm for Multiuser OFDM

Conference: European Wireless 2006 - 12th European Wireless Conference 2006 - Enabling Technologies for Wireless Multimedia Communications
04/02/2006 - 04/05/2006 at Athens, Greece

Proceedings: European Wireless 2006

Pages: 6Language: englishTyp: PDF

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Chen, Liang; Krongold, Brian; Evans, Jamie (ARC Special Research Centre for Ultra-Broadband Information Networks (CUBIN), Department of Electrical and Electronic Engineering, The University of Melbourne, VIC 3010, Australia)

This paper describes a practical and efficient adaptive subchannel, power and bit allocation algorithm for multiuser OFDM systems. Assuming perfect knowledge of CSI at the transmitter, we look at the problem of minimizing the total power consumption while maintaining individual rate requirements and QoS constraints. An average-SNR approximation is used to determine the bandwidth allocation while substantially reducing the computational complexity. The proposed algorithm guarantees improvement through each iteration and converges quickly to a stable suboptimal solution. Numerical results and complexity analysis show that the proposed algorithm offers a beneficial cost-versus-performance tradeoff compared to existing approaches.