Spectrum sensing in cognitive radio:use of cyclo-stationary detector

Dave, Manish B (2012) Spectrum sensing in cognitive radio:use of cyclo-stationary detector. MTech thesis.



Cognitive radio allows unlicensed users to access licensed frequency bands through dynamic spectrum access so as to reduce spectrum scarcity. This requires intelligent spectrum sensing techniques like co-operative sensing which makes use of information from number of users. This thesis investigates the use of cyclo-stationary detector and its simulation in MATLAB for licensed user detection. Cyclo-stationary detector enables operation under low SNR conditions and thus saves the need for consulting more number of users. Simulation results show that implementing co-operative spectrum sensing help in better performance in terms of detection. The cyclo-stationary detector is used for performance evaluation for Digital Video Broadcast-Terrestrial (DVB-T) signals. Generally, DVB-T is specified in IEEE 802.22 standard (first standard based on cognitive radio) in VHF and UHF TV broadcasting spectrum. The thesis is further extended to find the number of optimal users in a scenario to optimize the detection probability and reduce overhead leading to better utilization of resources. The gradient descent algorithm and the particle swarm optimization (PSO) technique are put to use to find an optimum value of threshold. The performance for both these schemes is evaluated to find out which fares better.

Item Type:Thesis (MTech)
Uncontrolled Keywords:Spectrum sensing, Cognitive radio, WRAN, Cyclo-stationary detector
Subjects:Engineering and Technology > Electronics and Communication Engineering > Wireless Communications
Divisions: Engineering and Technology > Department of Electronics and Communication Engineering
ID Code:4033
Deposited By:Unnamed user with email mbdave27@gmail.com
Deposited On:12 Jun 2012 16:00
Last Modified:12 Jun 2012 16:00
Supervisor(s):Patra, S K

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