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International Journal of Antennas and Propagation
Volume 2018, Article ID 2346317, 11 pages
https://doi.org/10.1155/2018/2346317
Research Article

Defense against Malicious Users in Cooperative Spectrum Sensing Using Genetic Algorithm

1Department of Electrical Engineering, Faculty of Engineering and Technology, International Islamic University, Islamabad 44000, Pakistan
2Department of Electronics, University of Peshawar, Peshawar 25000, Pakistan
3Department of Electrical Engineering, Air University, Islamabad 44000, Pakistan

Correspondence should be addressed to Noor Gul; kp.ude.uii@15eedhp.roon

Received 4 August 2017; Accepted 18 October 2017; Published 24 January 2018

Academic Editor: Ana Alejos

Copyright © 2018 Noor Gul 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

In cognitive radio network (CRN), secondary users (SUs) try to sense and utilize the vacant spectrum of the legitimate primary user (PU) in an efficient manner. The process of cooperation among SUs makes the sensing more authentic with minimum disturbance to the PU in achieving maximum utilization of the vacant spectrum. One problem in cooperative spectrum sensing (CSS) is the occurrence of malicious users (MUs) sending false data to the fusion center (FC). In this paper, the FC takes a global decision based on the hard binary decisions received from all SUs. Genetic algorithm (GA) using one-to-many neighbor distance along with z-score as a fitness function is used for the identification of accurate sensing information in the presence of MUs. The proposed scheme is able to avoid the effect of MUs in CSS without identification of MUs. Four types of abnormal SUs, opposite malicious user (OMU), random opposite malicious user (ROMU), always yes malicious user (AYMU), and always no malicious user (ANMU), are discussed in this paper. Simulation results show that the proposed hard fusion scheme has surpassed the existing hard fusion scheme, equal gain combination (EGC), and maximum gain combination (MGC) schemes by employing GA.