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Optimal Spectrum Management Strategy in Cognitive Radio

Author: YanZhiZhi
Tutor: ZhouXianJun
School: Hubei University of Technology
Course: Electrical Engineering
Keywords: Cognitive radio Spectrum Management Detection sequence The estimated time of Threshold
CLC: TN925
Type: Master's thesis
Year: 2011
Downloads: 74
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Abstract


The emergence of cognitive radio technology can alleviate tension and spectrum utilization lower spectrum resources on the one hand . This feature makes the cognitive radio spectrum management strategy faces many challenges but because the dynamic changes of the spectrum of cognitive user . The available spectrum of the current time , it may become unavailable spectrum of the next moment , the next moment the spectrum sensing and data transfer status also affect the update of the first spectral sequence . This paper focuses on spectrum sensing and detection , and more in-depth study of the entire process of cognitive radio spectrum management in dynamic spectrum network optimization algorithms and scheduling strategies to ensure the inter-node communication more efficient . Thesis work are as follows : 1 . Establish the sequence of an initialization available spectrum . Estimated based on idle time probability density to form a set of candidate spectrum , thus avoiding all channel -aware to reduce blindness finding idle spectrum . By setting a threshold to determine when cognitive perceived by the user to an available idle channels , this channel is good or bad , so get the best throughput , allowing the system to get high-speed run . Idle and available spectrum based on the formation the priority perception and detection of available spectrum sequence . 2 . A spectral sequence management strategy . The the initialization sequence available spectrum , spectrum management , the actual spectrum management need to be updated in a timely manner . When the high priority position spectrum idle but unavailable , and the frequency spectrum of the second priority position position exchange, and if the frequency spectrum of the high priority position is not idle, then the spectral shift in the first spectrum using the position in the sequence number of bits . Performance analysis shows that this improvement strategy , can be faster to search the available spectrum , the larger to reduce the transmission delay , and to improve the system throughput .

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