認知無線網(wǎng)絡分布式主動頻譜切換技術研究
[Abstract]:In spectrum utilization, the available spectrum and the spectrum with good performance are limited and have fixed allocation, but the demand for spectrum is increasing. On the other hand, the existing spectrum efficiency is not very high. Therefore, in cognitive wireless networks, when authorized users do not use spectrum, that is, when the channel is idle, cognitive users use idle spectrum to communicate without affecting the performance of authorized users to improve the utilization of spectrum. In the distributed active spectrum switching algorithm based on inaccurate perceptual information, the interactive clock synchronization and spectrum switching information are not needed between cognitive users, and the three states of the channel are used to determine the channel state. The false alarm, missed detection and error detection probability are used to correct the channel state transition probability, which corrects the inaccurate perceptual information and can effectively improve the accuracy of cognitive users' prediction of channel occupation in the future. Through this algorithm, the optimal channel is selected to communicate, and the passive switching times and collision times of cognitive users in the process of spectrum switching are reduced. Compared with centralized active spectrum switching, it also reduces the additional overhead such as computational complexity. In the distributed active spectrum switching algorithm based on spectrum aggregation, the probability of each state of the next slot channel is predicted by sensing the whole spectrum channel state and the channel state transition probability matrix. The optimal aggregation region and the optimal channel to meet the spectrum requirements in the aggregation region are selected to achieve the goal of minimum passive switching times in the aggregation region. At the same time, the performance of active switching times in aggregation area, total switching times in aggregation area, conflict times in channel access and communication process has been improved. The main innovation of this paper is that under the condition of distributed active spectrum switching, there is no need for interactive clock synchronization and spectrum switching information between cognitive users, by changing the channel state from the original two states to three states. A perception of other cognitive users has been added. Not only the conflict between cognitive users and authorized users is considered, but also the conflict between cognitive users is considered. At the same time, the channel state transition probability is corrected by using the perceived channel error probability, and the inaccurate perceptual information is corrected. On the basis of this model, we propose two algorithms: distributed active spectrum switching algorithm based on inaccurate perceptual information and distributed active spectrum switching algorithm based on spectrum aggregation technology.
【學位授予單位】:電子科技大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TN925
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