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Journal of Electrical and Computer Engineering
Volume 2010, Article ID 419430, 5 pages
http://dx.doi.org/10.1155/2010/419430
Research Article

Resource Allocation in a Cognitive Radio System with Imperfect Channel State Estimation

1School of Computer Engineering, Nanyang Technological University, Singapore 639798
2Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, B.C., Canada V6T 1Z4
3School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798

Received 17 October 2009; Accepted 23 February 2010

Academic Editor: Adam Panagos

Copyright © 2010 Tao Qin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Cognitive radio (CR) is a promising concept for improving the utilization of scarce radio spectrum resources. Orthogonal frequency division multiplexing (OFDM) is regarded as a technology which is well matched for CR systems. It is shown that channel estimation errors can result in a severe performance degradation in a multiuser OFDM CR system. A simple back-off scheme is proposed, and simulation results are provided which show that the proposed scheme is very effective in mitigating the negative impact of channel estimation errors.