Trustworthy Node Detection in Cognitive Radio in Hostile Environments
Keywords:
Cognitive radio, cooperative spectrum sensing, energy detector, trustworthy nodes detection.Abstract
The most important challenge in cognitive radio
networks is detection of primary user signal. Cooperation
among secondary users increases the performance of the system
significantly. In cooperative sensing in hostile environments,
intruder nodes send false sensing results to the fusion center and
make the fusion center erroneously decides about the presence
of the primary user. Several detection methods have been
proposed to nullify effects of malicious nodes. But in most of
these scenarios, the fading effects are not considered. In this
paper, we propose a method to identify trustworthy nodes in
hostile environments, considering fading effects. We introduce a
modified filtering method to reduce the effects of malicious
nodes. We also propose new trust factors to be assigned to the
nodes for increasing the effects of trustworthy nodes in the final
decision.
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