Dissertation > Excellent graduate degree dissertation topics show

On the Centralized Channel Allocation Strategy Based on Super-slot in Cognitive Radio Networks

Author: DaiYu
Tutor: JinShunFu; YangZhiGuo
School: Yanshan University
Course: Computer technology
Keywords: Cognitive Radio Network channel allocation super-slot access threshold queueing model system optimization
Type: Master's thesis
Year: 2013
Downloads: 0
Quote: 0
Read: Download Dissertation


In the wireless communication networks, the scarcity of spectrum resources is anindisputable fact. With only the static method, the shortage pressure of spectrum resourceis difficult to be alleviated. The dynamic spectrum allocation strategy which caneffectively improve the spectrum utilization has become a hot issue in the researches ofthe wireless communications. Considering the Cognitive Radio Network environments, acentralized channel allocation strategy based on a super-slot is proposed, and amathematical model is established. Moreover, performance analysis and systemoptimization are also conducted.Firstly, for the S-CSAS (Slot Based Centralized Spectrum Allocation Strategy),considering the general transmission time for the packets of secondary users, a queueingmodel with possible transmission interruption is established. By using the method of anembedded Markov chain, the system stationary distributions are given. With numericalexperiments, the influence of the traffic load for the secondary users and the arrival ratefor the packets of the primary users on the system performance is investigatedquantitatively. Then the traffic load of the secondary users is optimized.Secondly, in order to improve the throughput of secondary users, to reduce thechannel switching ratio, and to decrease the interferences to primary users as much aspossible, several continuous slots are combined into a super-slot. Letting the primary usersaccess channel with a preemptive priority based on a super-slot, a SS-CCAS (Super-SlotBased Centralized Channel Allocation Strategy) is proposed. A queueing model withpossible interruption at the boundary of a super-slot is established. Then the systemperformance of the SS-CCAS strategy is analyzed by using the method of a matrixgeometry solution.Thirdly, based on the SS-CCAS strategy, in order to improve the responseperformance of secondary users, the data packets of secondary users to enter the system islimited and a SS-CCAS-AT (Super-Slot Based Channel Allocation Strategy with AnAccess Threshold) in Cognitive Radio Networks is proposed. A queueing model withpossible interruption at the boundary of a super-slot and an access threshold is established. Then the system performance of the SS-CCAS-AT strategy is analyzed by using aGauss-Seidel method.Finally, through numerical experiments with analysis and simulation, the tradeoffbetween different performance metrics is investigated. For the SS-CCAS strategy, a profitfunction is constructed to optimize the super-slot size. For the SS-CCAS-AT strategy, acost function is constructed to optimize the access threshold and super-slot size.

Related Dissertations

  1. An Optimizing Study of Training System on Employee Development,F272.92
  2. Optimizing of SSR Analysis Sytem and Genetic Mapping of Apple (Qinguan × Fuji),S661.1
  3. Investigation of Dynamic Channel Allocation Algorithms in the TD-SCDMA Trunking System.,TN929.533
  4. Defense Against Primary User Emulation Attack Based on Channel Characteristics in Cognitive Radio Networks,TN925
  5. RL Company Performance Appraisal System Optimization Research,F272.92
  6. Establishment and Optimization of the Anther Culture System of Artemisia Annua L. (Chinese Wormwood),S567.219
  7. Study on Adding-storeys Renovation and Reinforcement Methods of Framework Based on the Overall Performance,TU746.3
  8. Robust Design Optimization for Automotive Fuel Tank Slosh Noise Depression,U464.136
  9. D City Unicom Group Account Manager Salary System Optimization,F626
  10. Study of the Exhaustive-Service M/D/1 Queueing Model with Optional Server Vactions,O226
  11. Behavior of the Composite System of Deep Mixing and Concrete Pile Wall at Deep Excavations in Soft Soils,TU753
  12. Study on Logistics Emergency Support System Optimization in APF,R821
  13. The Research of Freeway Network Traffic Regulation Based on Expense Function,F224;U491
  14. Design and Simulation of Sewage-Source Heat Pump System with Multilevel Sprinkling Heat Exchanger,TQ460.9
  15. Urban core area road network traffic microcirculation system optimization and application,U491.13
  16. Optimazation Route on the Letter-Pleaing System Malfuction from the Grass Roots,D632.8
  17. Research of Routing and Channel Assignment in Cognitive Wireless Mesh Networks,TN929.5
  18. The Study of Channel Allocation Strategies in GPRS Networks,TN929.5
  19. Access Point Placement and Channel Assignment in WLAN,TN925.93
  20. Key Techniques of TD-SCDMA Implement in RNP Tool,TN929.533
  21. Utilization of the Exergy Theory in Energy Audition,F239.6

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications
© 2012 www.DissertationTopic.Net  Mobile