27 - STUDENT - Spectrum Sensing Techniques for OFDM-Based Cognitive Radio Networks

Omar Alhussein, R. Mahmoud, Kh. Eledlebi, Z. Saed (Khalifa University for Science)

The need for efficient utilization of spectrum has become a fundamental requirement in modern wireless networks, which is mainly due to spectrum scarcity and the ever-increasing demand for higher data rate applications and internet services. Cognitive radios have shown to be very efficient in maximizing spectrum utilization due to its inherent spectrum sensing capability. In a cognitive radio network environment, different users can be categorized as Primary Users (PUs), who are known as users having higher priority, and Secondary Users (SUs), who represent those users wishing to opportunistically access the spectrum.
Three detection techniques are commonly used for spectrum sensing in CRs, namely, energy detection, matched filters, and cyclostationary detection. In energy detection which is the one with less complexity, the presence of a PU signal is simply detected by comparing the output of the energy detector with a certain threshold that depends on signal-to-noise ratio in the system.

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