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Cognitive radio spectrum access network algorithm

Author: ZhangYingXiao
Tutor: YangTao
School: Fudan University
Course: Circuits and Systems
Keywords: Cognitive radio Spectrum sensing POMDP Spectrum allocation
CLC: TN925
Type: Master's thesis
Year: 2010
Downloads: 66
Quote: 0
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Abstract


With the continuous development of wireless communication technology , as a non- renewable resource increasingly scarce radio spectrum . However , FCC statistics show that , although some wireless spectrum is already very crowded, but there is still a lot of radio spectrum resources idle. Subject to the implementation of radio spectrum resource allocation fixed distribution, one can not take advantage of these spare flexible spectrum resources, which are currently the main radio spectrum management problem . Opportunistic spectrum access is the development trend of today's radio technology , spectrum management is fixed rules breakthrough. Cognitive Radio (Cognitive Radio, CR) is an opportunistic spectrum access techniques , through the wireless communications parameters surrounding the historical values ??of the current observation to detect , analyze , learning and reasoning , and based on the observation adjust their transmission parameters to the appropriate frequency to an appropriate modulation scheme and transmit power to complete the user's wireless transfer tasks . Cognitive radio technology can effectively improve the spectrum utilization efficiency. Firstly, the origins of cognitive radio technology , development and research status of a brief introduction is given to the definition and function of cognitive radio ; secondly , elaborated cognitive radio spectrum sensing and spectrum access technologies , were given spectrum sensing and spectrum access the main methods and research model ; addition, according to cognitive radio spectrum sensing and access characteristics of the problem , the establishment of a partially observable Markov decision process (POMDP) ??model . In the framework of this model is proposed based on the maximum likelihood criterion channel transition probability estimation algorithm . POMDP -based optimal access strategy algorithm is analyzed using Markov channel convergence characteristics , we propose a finite iteration POMDP based spectrum access algorithm , while maintaining performance while greatly reducing the computational complexity ; Finally , the establishment of a distributed POMDP model of cooperation , in this framework , the adjacent cognitive users exchange information and local policy , through a policy gradient method of gradual approximation of the global optimum access, reducing the individual cognitive user independent decision-making the conflict improve spectrum efficiency .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Radio relay communications,microwave communications
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