Resource allocation in a cognitive radio system with imperfect channel state estimation

Authors:
Tao Qin;Cyril Leung;Chunyan Miao;Zhiqi Shen
Affiliations:
School of Computer Engineering, Nanyang Technological University, Singapore;Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, B.C., Canada;School of Computer Engineering, Nanyang Technological University, Singapore;School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore
Venue:
Journal of Electrical and Computer Engineering
Year:
2010

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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.