可充電協(xié)作認(rèn)知無線網(wǎng)絡(luò)的中斷性能分析
[Abstract]:In recent years, intelligent devices, applications and services based on wireless communication have shown explosive growth. However, the spectrum resources available for wireless communication are limited. Under the current spectrum allocation mechanism, the spectrum efficiency is low. Therefore, cognitive radio technology, which can improve spectrum efficiency, has attracted extensive attention of experts and scholars. The communication system based on cognitive radio technology can make full use of the limited spectrum resources and provide better quality services. In addition, the characteristics of wireless transmission determine that the transmission rate and quality of service of traditional wireless communication systems can not meet the high requirements. Therefore, the cooperative cognitive network, which can improve the quality of wireless communication and spectrum utilization efficiency at the same time, is worth studying. Moreover, as a common problem in wireless communication systems, continuous energy supply is also an important problem in cooperative cognitive networks. Therefore, this paper applies portable communication technology to cooperative cognitive network. In this paper, from the point of view of information theory, the communication quality and physical layer security of rechargeable cooperative cognitive network are studied. The influence of different parameters on the communication quality and security performance of the system is analyzed in detail. In addition, this paper also studies different cooperation strategies in rechargeable cooperative cognitive networks, that is, single relay and multiple relay collaboration. Moreover, the performance of the two cooperation strategies is compared and analyzed. Considering that Nakagami-m fading channel is closer to actual wireless channel than Rayleigh fading channel, Nakagami-m fading channel is used in this paper. Specifically, the main research contents and achievements of this paper are as follows: first, the expressions of the rates that can be realized by the main users in the rechargeable cooperative cognitive network under the single relay cooperation mechanism and the multi-relay cooperation mechanism are analyzed. Then, according to the definition of interrupt probability, the concrete expression of interrupt probability is obtained when the main user uses single relay and multi-relay cooperation respectively. Secondly, the effects of different coefficients on the interrupt performance of the system are studied and the interrupt performance of direct transmission, single relay cooperation and multi-relay cooperation under different coefficients is compared. Among them, the single relay cooperation strategy is superior to direct transmission and multi-relay cooperation in terms of the tradeoff between the rate that can be realized by secondary users and the rate that can be realized by primary users. In other words, in the system with single relay cooperation strategy, secondary users can get more benefits. Thirdly, the problem of security interruption in rechargeable cooperative cognitive networks is studied, and the security capacity of primary users in rechargeable cooperative cognitive networks under single relay and multi-relay cooperation strategies is analyzed. According to the definition of safe interrupt probability, the concrete expression is obtained by derivation. Fourth, the influence of different coefficients on the security performance of the system is studied, and the security interrupt performance of single relay cooperation and multi-relay cooperation strategy is compared. It is found that the security interrupt performance of the primary user under the single relay cooperation strategy is better than that of the multi-relay cooperation strategy.
【學(xué)位授予單位】:西南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TN925
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