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Mathematical Problems in Engineering
Volume 2015, Article ID 839698, 12 pages
http://dx.doi.org/10.1155/2015/839698
Research Article

A Robust Cooperative Spectrum Sensing-Assisted Multiuser Resource Allocation Scheme

1College of Communications Engineering, PLA University of Science & Technology, Nanjing, Jiangsu 210007, China
2Unit 72241, PLA, Jinan, Shandong 250029, China

Received 27 April 2014; Accepted 25 July 2014

Academic Editor: Guido Maione

Copyright © 2015 Jun Du 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), which is proposed as a solution for spectrum scarcity, imposes some threats to the network. One severe attack to cognitive radio network is the primary user emulation attack (PUEA), in which an attacker may transmit its signal with high power or mimic specific features of the primary user’s signal to prevent secondary users from accessing the licensed spectrum. In this paper, we study a subcarrier and power allocation problem for orthogonal frequency division multiple access-(OFDMA-) based CR systems in the presence of PUEA. To maximize the system throughput while keeping the interference introduced to the primary user (PU) below given thresholds with a certain probability, a joint design of a robust cooperative spectrum sensing and a resource allocation scheme is proposed. In the proposed scheme, the inaccurate classification of PU signals and PUEA signals provided by robust cooperative spectrum sensing is utilized by resource scheduling module. To further exploit the underutilized spectrum bands, we also evaluate the performance of the proposed scheme in the hybrid overlay/underlay spectrum access mechanism. Numerical results demonstrate the effectiveness of the proposed scheme compared to conventional scheme regardless of the number of SUs or the kind of spectrum access mechanism being used.