Cognitive Radio: Comparison of Methods for Free Band Detection

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Middlesex University, School of Engineering and Information Sciences, Computer Communications , İngiltere

Tezin Onay Tarihi: 2012

Tezin Dili: İngilizce

Öğrenci: Ismail Ünal

Danışman: Enver Ever

Özet:

Cognitive Radio is a way of fulfilling communication needs for those who require them mostly such as radio resources and wireless services. Cognitive Radio is an emerging technology for spectrum scarcity, price of spectrum bands and underutilization. Also restriction of present radio spectrums exposes needs for Cognitive Radio.

As a main duty of cognitive radio, spectrum sensing finds unused channels on operating spectrum. By applying different type algorithms, cognitive radio spectrum sensing works for above reasons. Cognitive radio mechanism is studied carefully to understand and apply through simulation programs. Also thesis includes cognitive radio mechanism according to need of this thesis. And spectrum sensing mechanisms, algorithms and case studies are included.

This thesis exhibits different scenarios for cognitive radio spectrum sensing and compares them by taking some variables as a reference. Three different methods broadly explained, then simulated by using “fresh” simulation tool SEAMCAT after that resulted according to cognitive radio needs and variables. It stands for Spectrum Engineering Advanced Monte Carlo Analysis tool. This thesis also includes cognitive radio spectrum sensing’s main structure as well as it represent SEAMCAT simulation tool cognitive radio approach. SEAMCAT simulation tool is a free of charge simulation tool which has cognitive radio capabilities that developed a year ago within the frame of European Conference of Postal and Telecommunications Administrations.

As well as input parameters are represented in this thesis, scenario facilities, simulation characteristic, SEAMCAT organization, attributes of all scenarios and screenshots of each step are also provided.

Through simulating by SEAMCAT simulation tool, results in this thesis provide wide range of outputs in categories that vary. Results show that under some circumstances scenario 2 is better than scenario 1, and scenario 3 is the best one. If these circumstances change results may vary. Having so many variables in simulation environment is let author to constrain some of variables as constant values according to previous studies as described in related sections.