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Research on Dynamic Spectrum Allocation Algorithm in Cognitive Radio

Author: HouMaoSen
Tutor: XieXianZhong；FuChengPeng
School: Chongqing University of Posts and Telecommunications
Course: Applied Computer Technology
Keywords: Cognitive Radio Spectrum occupies model Dynamic spectrum allocation Channel state prediction Channel capacity estimates
CLC: TN929.5
Type: Master's thesis
Year: 2010
Downloads: 163
Quote: 1
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Abstract


With the development of wireless communication technologies , spectrum resources becomes more and more crowded , the left spectrum of new communication systems and technology resources fewer or even no spectrum can be assigned . However, the utilization of the licensed spectrum resources that have been assigned only in the range of 15% to 85 % , and in many cases the use efficiency is low. Cognitive radio technology is to solve the above problem , dynamic spectrum allocation is the key technology of cognitive radio (CR) system , its study has important theoretical and application value . Perception radio channel of the dynamic characteristics of the perception of the radio spectrum occupies model Markov model probability statistics estimated spectrum occupancy situation as well as channel state changes in circumstances , based on the estimated results , conduct real-time prediction spectrum occupied by the situation and achieve channel capacity estimates , given a capacity estimation formula . The simulation results show that the proposed method of channel state prediction and capacity to estimate the accuracy of high dynamic frequency selection provides a good reference for the quality of service (QoS) - based cognitive radio . Existing dynamic spectrum allocation methods are mainly focused on spectrum allocation conflict , as well as to maximize the spectrum utilization , etc. , did not fully consider the statistics of the dynamic spectrum , different business users need different bandwidth and real-time - non - real - time needs . This article proposes a statistics - based multi-queue CR dynamic spectrum allocation , and general the exclusive allocation method with the spectrum pool sharing method comparison . Simulation results show that in the case of centralized control , the spectrum pool sharing can ensure a better distribution fairness spectrum switch and provide a higher system throughput .

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