【摘要】：隨著科學技術(shù)的飛速發(fā)展,無線通信技術(shù)不斷涌現(xiàn),并需要為這些新的技術(shù)分配頻譜資源。現(xiàn)有的靜態(tài)頻譜分配方案,需要為每一類技術(shù)分配一個固定的頻段,這就導(dǎo)致了可用頻譜資源越來越少。認知無線電是解決這種頻譜供需矛盾的一個手段,系統(tǒng)針對授權(quán)頻段利用率不高現(xiàn)象,提出認知用戶在不影響授權(quán)用戶的前提下,合理利用頻譜空洞進行通信,從而解決頻譜資源的供需矛盾并提高頻譜的利用率。頻譜感知技術(shù)是認知無線電的關(guān)鍵技術(shù),本文對單點頻譜感知技術(shù)和協(xié)作頻譜感知技術(shù)進行深入的研究。論文分析了現(xiàn)有的單點頻譜感知技術(shù)和協(xié)作頻譜感知技術(shù)的不足,提出了空域協(xié)作感知方法。提出的方法能夠通過RSSI算法和三邊定位算法得出授權(quán)用戶的位置、功率等信息,該授權(quán)用戶信息可以輔助得到結(jié)合空域信息的頻譜狀態(tài),從而提高頻譜資源的利用率。最終在基于USRP硬件平臺的單頻點頻譜感知模塊的基礎(chǔ)上,完成并實現(xiàn)了空域協(xié)作感知方法的有效性。
[Abstract]:With the rapid development of science and technology, wireless communication technology is emerging, and these new technologies need to allocate spectrum resources. The existing static spectrum allocation schemes need to allocate a fixed frequency band for each kind of technology, which leads to less and less available spectrum resources. Cognitive radio is a method to solve the contradiction between supply and demand of spectrum. Aiming at the phenomenon of low utilization of authorized frequency band, the system proposes that cognitive users can make use of spectrum holes to communicate reasonably without affecting authorized users. In order to solve the contradiction between supply and demand of spectrum resources and improve the efficiency of spectrum. Spectrum sensing technology is the key technology of cognitive radio. In this paper, single point spectrum sensing technology and cooperative spectrum sensing technology are deeply studied. In this paper, the shortcomings of the existing single point spectrum sensing and cooperative spectrum sensing techniques are analyzed, and a spatial cooperative sensing method is proposed. The proposed method can obtain the location and power information of authorized users through RSSI algorithm and trilateral location algorithm. The information of authorized users can help to obtain the spectrum state combined with spatial information and thus improve the utilization of spectrum resources. Finally, based on the single frequency spectrum sensing module based on USRP hardware platform, the effectiveness of spatial cooperative sensing method is completed and realized.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN925

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本文編號：2285722