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In cognitive radio based cooperative sensing systems, some secondary users are likely to act malicious. Such secondary users are called malicious users. An optimal application of Dixon's outlier detection scheme for detecting malicious users in a cognitive radio cooperative spectrum sensing system has recently been termed as the Sliding Window Dixon's test. The Sliding window Dixon's test applies the Dixon's test on the smaller data sets with maximum overlaps. However, it is found that this scheme is highly complex. In this paper, we propose a novel scheme to exploit the robustness of the Dixon's test without compromising on its complexity. Simulations demonstrate that the proposed methods are efficient in suppressing multiple malicious users. Keywords— Sub-optimal low complex scheme, Cognitive Radio, Cooperative Spectrum Sensing, Secondary User, Malicious User, Dixon's test, Sliding Window Dixon's test

A Sub-Optimal Low Complex Multiple Malicious Users’ Detection Mechanism in a Cooperative Spectrum Sensing System