Dissertation > Excellent graduate degree dissertation topics show

Research on Key Technologies for Cognitive Radio System

Author: LiuChao
Tutor: ZhangShunYi
School: Nanjing University of Posts and Telecommunications
Course: Information network
Keywords: Cognitive Radio Spectrum Sensing Spectrum Allocation Game Theory Channel Allocation Power Control
CLC: TN925
Type: PhD thesis
Year: 2013
Downloads: 69
Quote: 0
Read: Download Dissertation

Abstract


In order to improve the efficiency of system bandwidth and protect the user’s quality of service, several key issues of congnitve radio have been studied in this thesis, which includes spectrum sensing, spectrum allocation, channel allocation and power control. The contributions and results are listed as follows:Other than the traditional method, a new in-band spectrum sensing technique based on linear self-signal elimination in cognitive radio is proposed in this work. The method eliminates the self-signal in the received signal through the linear weighting of the adjacent reception symbol by using the AR model of wireless fading channel. Based on the Neyman-Pearson criterion an optimum detector for spectrum sensing of the residual signal is presented. The simulation results demonstrate that the proposed method is better than the existing in-band spectrum sensing methods without Quiet Period when the Doppler frequency shift is large. The algorithm achieves an acceptable detection performance for IEEE802.22system and improves the performance of spectrum sensing.For the requirements of improving spectrum utilization, reducing power consumption and guaranteeing quality of service for cognitive radio, two algorithms are developed by using orthogonal frequency division multiplexing. The proposed algorithms solve the problem of spectrum sharing between the cognitive radio and the orthogonal frequency division multiplexing. Compared with the traditional static spectrum allocation algorithm based on the FDMA, the proposed algorithms can satisfy the QoS requirements, and improve the system capacity by nearly30%. A spectrum allocation model of cognitive user is built based on the study. It solves the balance of chain game model by introducing appropriate coordination mechanism. Simulation results verify the advantage from the aspects of mathematical expectation of payoff, channel usage and communication time.In order to solve the channel assignment problem in multi-radio multi-channel network, a game-theoretical formulation is presented. Firstly, a utility function is constructed which considers the channel load-balance and fairness among players. Secondly, a channel assignment model is built based on the non-cooperative game. Thirdly, a novel channel assignment algorithm with fairness and load-balance is proposed. The simulations verify that the proposed algorithm can achieve the load balance of the channel and fully guarantee the validity and fairness of the users.A heuristic algorithm is proposed to solve the problem of optimal power control with QoS constraint for OFDM based cognitive radio network. As a result, the cognitive radio network achieves the optimal power allocation. In order to solve the problem of channel allocation and power control of cognitive wireless network, an optimal mathematical model for common channel and power allocation is presented in this paper. The model utilizes the interference power model under imperfect spectrum sensing. Using penalty function to simplify the nominal mixed integer programming to be an unconstrained nonlinear programming, an optimal allocation approach based on genetic algorithm is proposed. The proposed algorithm can achieve the jointly optimal allocation for power control and channel resource, reduce the power interference for the primary user, and reach the maximum throughput of cognitive users under imperfect spectrum sensing.

Related Dissertations

  1. Power Aware Routing Protocal Based on OLSR in Ad Hoc Network,TN929.5
  2. Research on MAC Protocol for WIreless Sensor Network,TN915.04
  3. Government harmony handle mass incidents Game Analysis,D630
  4. Research of Spectrum Sensing on Cognitive Radio,TN925
  5. Research on Single Node Spectrum Sensing Method in Cognitive Radio,TN925
  6. Wireless network based multi- layer protocols transmit power across key technologies,TN92
  7. The Design and Implementation of Open Laboratory Management System,TP311.52
  8. Researches of Spectrum Sensing Based on the Minimum Bayes Risk,TN925
  9. The Research of Credit Management Countermeasure to Network Group Buying in China,F203
  10. Research on Sidelobe Suppression for NC-OFDM Systems,TN919.3
  11. Research of the Relationship between Clan System and Principal-agent Relationship in Huizhou Pawnshops,K248
  12. Information Economics Perspective Library Service,G252
  13. Power management based on Multi-Radio MAC protocol for wireless sensor networks,TP212.9
  14. Jointly Optimal Power Control and Congestion Control for Ad Hoc Networks,TN929.5
  15. Based on the "Five Zones" Fuzzy Control for Substation Voltage and Reactive Power,TM761.1
  16. On the Realization of the Unerringness of Criminal Responsibility,D924.1
  17. Coordinated Wireless Resource Optimization Allocation in Multi-cell Networks,TN929.5
  18. Design and Implementation of a Fault-Tolerant Topology Control Algorithm for the Space Information Network,TN915.02
  19. The Research on the Ecological Compensation Mechanism of the Development of Mineral Resources in Guizhou Province,F205;F224.32
  20. Research on the Optimal Urban Transportation Network Based on the Minimum Polluting Emission,F572
  21. Research on Core Stakeholders of Public Project Based on Game Theory,F224.32

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