本文關鍵詞： 認知中繼 功率分配 全雙工 認知容量 中斷概率　出處：《電子科技大學》2014年碩士論文　論文類型：學位論文

【摘要】：認知無線電技術作為提高頻譜資源利用率的有效手段近年來得到了廣泛地關注和研究。在認知系統(tǒng)中,認知用戶能夠利用合法授權主用戶的頻譜資源進行通信,前提是其發(fā)射功率不能過高進而影響到主用戶的通信質(zhì)量,這一使用前提使得認知網(wǎng)絡中發(fā)射節(jié)點的功率很受限制,造成其信號的覆蓋范圍較小,特別是長距離通信會變得很困難,系統(tǒng)通信速率較低,限制了頻譜利用率的提升空間。而中繼技術作為提高信號覆蓋、提升系統(tǒng)容量、和抗擊衰落的有效手段被深入研究,因此中繼技術與認知無線電結(jié)合進一步提升頻譜效率就成為了研究的熱點。現(xiàn)有的大量關于認知中繼系統(tǒng)的研究都是集中在半雙工認知中繼系統(tǒng)上面,然而關于中繼的研究表明,全雙工中繼相對半雙工中繼因其全雙工增益特性可能提供更好的系統(tǒng)性能,因此為更進一步提高頻譜利用率考慮,本文對全雙工認知中繼系統(tǒng)進行的研究就變得很有必要。文中首先在第一章對頻譜資源日益緊張的狀況和認知無線電作為提高頻譜利用率有效手段的基本原理分別進行了介紹,并對認知中繼的研究現(xiàn)狀做了詳細描述。第二章針對半雙工認知中繼系統(tǒng)可能有一個時隙會產(chǎn)生浪費這一問題,為充分利用時隙資源,本章研究了一個既含有直接鏈路又含有中繼輔助鏈路的認知中繼系統(tǒng),并分別從瞬時干擾信道和統(tǒng)計干擾信道兩個角度分析了該認知中繼系統(tǒng)的功率優(yōu)化問題,分別得到了在這兩種情況下的最優(yōu)功率分配方法。第三章介紹分析了全雙工DF(Decode-and-Forward)認知中繼系統(tǒng)的功率分配及中斷概率。在瞬時干擾信道下,提出了一種基于無協(xié)作情況的干擾平均分配的功率分配方法,并得到了該方法下的中斷概率表達式;然后分析了有協(xié)作下認知系統(tǒng)的最優(yōu)功率分配問題,得到了最優(yōu)的功率分配方法,并從噪聲主導和干擾主導兩個角度分析了最優(yōu)功率分配下認知系統(tǒng)的中斷概率。另外,從更實際的角度出發(fā),文中分析了在主用戶中斷概率限制下的最優(yōu)功率分配問題,由于問題直接解決十分困難,文中分別分析了其在噪聲主導和干擾主導下的功率分配方法。由于第三章中關于全雙工DF認知中繼系統(tǒng)得到的結(jié)果不能簡單的直接套用到全雙工AF(Amplify-and-Forward)認知中繼系統(tǒng)中,且全雙工AF認知中繼相較全雙工DF認知中繼更為簡單實用,所以第四章研究了全雙工AF認知中繼系統(tǒng)的功率分配問題。本章基于實際的干擾信道獲取情況從三個方面對全雙工AF認知中繼系統(tǒng)的功率分配問題進行了研究,即瞬時干擾信道下、統(tǒng)計干擾信道下、和未知干擾信道下,分別得到了閉合的最優(yōu)功率分配表達式、一種迭代搜索的功率分配方法、和一種基于感知的迭代搜索方法。第五章對全文進行了總結(jié),并指出以后可行的研究方向。
[Abstract]:As an effective means to improve the efficiency of spectrum resources, cognitive radio technology has been widely studied in recent years. In cognitive systems, cognitive users can use the spectrum resources of legitimate authorized primary users to communicate. The premise is that the transmission power should not be too high and thus affect the communication quality of the primary user. This premise makes the power of the transmitting node in the cognitive network very limited, resulting in the smaller coverage of the signal. In particular, long distance communication will become very difficult, and the system communication rate will be low, which limits the spectrum efficiency, and relay technology as an effective means to improve signal coverage, enhance system capacity, and combat fading has been deeply studied. Therefore, the combination of relay technology and cognitive radio to further improve spectral efficiency has become a hot topic. Many existing researches on cognitive relay systems are focused on half-duplex cognitive relay systems. However, researches on relay show that full-duplex relay may provide better system performance than half-duplex relay because of its full-duplex gain characteristics. It is necessary to study full duplex cognitive relay system in this paper. In the first chapter, we introduce the situation of spectrum resource becoming increasingly tight and the basic principle of cognitive radio as an effective means to improve spectrum efficiency. The second chapter aims at the problem that there may be a time slot waste in the half-duplex cognitive relay system, in order to make full use of the time slot resources. In this chapter, a cognitive relay system with both direct link and relay auxiliary link is studied, and the power optimization problem of the cognitive relay system is analyzed from the perspective of instantaneous interference channel and statistical interference channel, respectively. In chapter 3, the power allocation and interrupt probability of fully duplex DFO Decode-and-Forward-based cognitive relay system are analyzed. In this paper, a power allocation method based on interference average allocation without collaboration is proposed, and the expression of interruption probability is obtained, and then the optimal power allocation problem for cognitive systems with collaboration is analyzed. The optimal power allocation method is obtained, and the outage probability of the cognitive system under the optimal power allocation is analyzed from the point of view of noise dominance and interference dominance. In addition, from a more practical point of view, In this paper, the optimal power allocation problem under the limit of primary user interrupt probability is analyzed. It is very difficult to solve the problem directly. In this paper, the power allocation methods under noise and interference are analyzed, respectively. Since the results obtained from the full-duplex DF cognitive relay system in Chapter 3 can not be applied directly to the full-duplex AFA Amplify-and-Forward-based cognitive relay system, And full duplex AF cognitive relay is more simple and practical than full duplex DF cognitive relay. Therefore, in Chapter 4th, the power allocation problem of full-duplex AF cognitive relay system is studied. Based on the actual interference channel acquisition, the power allocation problem of full-duplex AF cognitive relay system is studied from three aspects. That is, the closed optimal power allocation expression is obtained for instantaneous interference channel, statistical interference channel and unknown interference channel, and an iterative search power allocation method is proposed. Chapter 5th summarizes the full text and points out the possible research directions in the future.
【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

【相似文獻】

相關期刊論文 前10條

1 周想凌;微波同頻中繼系統(tǒng)設計計算的特殊性探討[J];電力系統(tǒng)通信;1996年03期

2 孫少輝;南海濤;張景忠;;對便攜式應急移動調(diào)頻中繼系統(tǒng)的測試研究[J];中國無線電;2007年11期

3 唐倫;龍葉華;陳前斌;曾孝平;;協(xié)作中繼系統(tǒng)多目標聯(lián)合的跨層資源分配[J];應用科學學報;2011年04期

4 田心記;海林鵬;張延良;李亞;;3時隙的雙向中繼系統(tǒng)中用戶選擇的性能分析[J];計算機應用研究;2013年01期

5 李超林;;無線通信中協(xié)同中繼系統(tǒng)鏈路層關鍵技術研究[J];科技通報;2013年06期

6 鄭侃;蔣輝;龍航;王文博;;預編碼技術在協(xié)同中繼系統(tǒng)中的應用[J];電信科學;2008年08期

7 侯萌;;無源中繼系統(tǒng)在現(xiàn)網(wǎng)中運用的可行性研究[J];廣東通信技術;2010年12期

8 蘇莉萍;;協(xié)同中繼系統(tǒng)功率分配算法研究[J];廣西工學院學報;2013年01期

9 宋文;唐倫;陳前斌;;基于中繼系統(tǒng)的功率分配研究[J];電視技術;2009年S2期

10 臧蕓妍;;綜合模塊化浮空器中繼系統(tǒng)設計[J];電訊技術;2013年06期

相關會議論文 前2條

1 王永奇;張永貴;;基于無線中繼系統(tǒng)的井下安全避險系統(tǒng)應用[A];第九屆全國采礦學術會議暨礦山技術設備展示會論文集[C];2012年

2 劉金柳;李穎;孫岳;;一種適用于半雙工MIMO中繼系統(tǒng)的新型發(fā)送端預編碼策略[A];中國電子學會第十七屆信息論學術年會論文集[C];2010年

相關博士學位論文 前10條

1 張超;分布式空時中繼系統(tǒng)的關鍵技術研究[D];中國科學技術大學;2010年

2 石t，

本文編號：1505235