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Using Game Theory to Battle Jammer in Control Channel of Ad-hoc Cognitive Radio Networks

Golzari Oskoui, Mohammad Reza | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47407 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Salehi, Javad
  7. Abstract:
  8. Due to both dynamic and opportunistic spectrum access, Cognitive radio networks is a promising solution for spectrum scarcity problem. In cognitive radio networks, users need to have a control channels in order to cooperate for sharing the sensing information, channel sharing and etc. In Ad-hoc cognitive radio networks because of the absence of infrastructure and central nodes, every user runs a distributed algorithm to create a common control channel. If the control channel gets jammed, network’s performance degrades dramatically, therefore the jammer’s target in cognitive radio networks is the control channels to disturb the networks’ performance. The traditional solution to confront jammer is using a frequency hopping sequence. Cognitive radio networks intelligence, dynamic spectrum access and learning algorithms all create challenges for jammer. To model these complexities we use Game Theory. First we study the sweep attack and its harmful influence on the control channels. Accordingly, by using game theoretic concepts and stochastic games and also by defining states, actions and players rewards, we design a stochastic game with multiple users to make control channels resilient against sweep attack. Wolf Q learning algorithm has been used to solve the designed game and variable learning rate has been used to make sure that the designed game converges. Finally we propose a distributed algorithm for network users to create maximum number of resistive control channels against jammer. By simulation we show that in the presence of dynamic channel variations and imperfect sensing, the proposed method outperforms existing ones in terms of jammer resistivity
  9. Keywords:
  10. Cognitive Radio ; Game Theory ; Ad Hoc Network ; Control Channel ; Adversary (Jammer)

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