Hussien Al-Hmood
Start date: 01/07/2011
Email: hussien.al-hmood@brunel.ac.uk
Supervisor: Professor Hamed Al-Raweshidy
PhD Research Title: A Proposed Wideband Spectrum Sensing Techniques for Cognitive Radio Systems
My research topic is about the spectrum sensing (SS) in cognitive radio (CR) systems. Cognitive radio (CR) system has been proposed to become a tempting solution to the spectrum scarcity problem. Spectrum sensing is one of the major functionalities in cognitive radio, which allows CRs to monitor spectrum band of interest. There are a lot of techniques for spectrum sensing and each one has some problems. Some of them are related to the flexibility, accuracy, power consumption, speed, noise sensitivity and/or complexity. Our proposed spectrum detection techniques will fix or reduce the effect of most previous problems. As a result, more efficient spectrum usage can be achieved. At the same time, existing users can maintain their communications without being interfered. In the first part of our research, we have divided our proposed techniques into two approaches are advanced energy detection (AED) and enhanced multi-resolution spectrum sensing (EMRSS). In the second part, we have suggested some mathematical solutions to reduce the effect of incorrect choice of threshold value that used in our previous spectrum sensing. For both parts, we will measure the performance of the cognitive radio system by computing the probability of detection (Pd) and probability of misdetection (Pmd) versus signal to noise ratio (SNR) and probability of false alarm (Pfa) respectively.
Figure shows PSD analysis of wide band signal. Sub-bands with high PSD are used by primary user (PU) and sub-bands with low or zero PSD can be used by CR user.
