本文關(guān)鍵詞： 認(rèn)知中繼 功率分配 全雙工 認(rèn)知容量 中斷概率　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：認(rèn)知無線電技術(shù)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(guān)注和研究。在認(rèn)知系統(tǒng)中,認(rèn)知用戶能夠利用合法授權(quán)主用戶的頻譜資源進(jìn)行通信,前提是其發(fā)射功率不能過高進(jìn)而影響到主用戶的通信質(zhì)量,這一使用前提使得認(rèn)知網(wǎng)絡(luò)中發(fā)射節(jié)點(diǎn)的功率很受限制,造成其信號(hào)的覆蓋范圍較小,特別是長(zhǎng)距離通信會(huì)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(shù)作為提高信號(hào)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(shù)與認(rèn)知無線電結(jié)合進(jìn)一步提升頻譜效率就成為了研究的熱點(diǎn)。現(xiàn)有的大量關(guān)于認(rèn)知中繼系統(tǒng)的研究都是集中在半雙工認(rèn)知中繼系統(tǒng)上面,然而關(guān)于中繼的研究表明,全雙工中繼相對(duì)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(jìn)一步提高頻譜利用率考慮,本文對(duì)全雙工認(rèn)知中繼系統(tǒng)進(jìn)行的研究就變得很有必要。文中首先在第一章對(duì)頻譜資源日益緊張的狀況和認(rèn)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(jìn)行了介紹,并對(duì)認(rèn)知中繼的研究現(xiàn)狀做了詳細(xì)描述。第二章針對(duì)半雙工認(rèn)知中繼系統(tǒng)可能有一個(gè)時(shí)隙會(huì)產(chǎn)生浪費(fèi)這一問題,為充分利用時(shí)隙資源,本章研究了一個(gè)既含有直接鏈路又含有中繼輔助鏈路的認(rèn)知中繼系統(tǒng),并分別從瞬時(shí)干擾信道和統(tǒng)計(jì)干擾信道兩個(gè)角度分析了該認(rèn)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(rèn)知中繼系統(tǒng)的功率分配及中斷概率。在瞬時(shí)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(dá)式;然后分析了有協(xié)作下認(rèn)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(dǎo)和干擾主導(dǎo)兩個(gè)角度分析了最優(yōu)功率分配下認(rèn)知系統(tǒng)的中斷概率。另外,從更實(shí)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(dǎo)和干擾主導(dǎo)下的功率分配方法。由于第三章中關(guān)于全雙工DF認(rèn)知中繼系統(tǒng)得到的結(jié)果不能簡(jiǎn)單的直接套用到全雙工AF(Amplify-and-Forward)認(rèn)知中繼系統(tǒng)中,且全雙工AF認(rèn)知中繼相較全雙工DF認(rèn)知中繼更為簡(jiǎn)單實(shí)用,所以第四章研究了全雙工AF認(rèn)知中繼系統(tǒng)的功率分配問題。本章基于實(shí)際的干擾信道獲取情況從三個(gè)方面對(duì)全雙工AF認(rèn)知中繼系統(tǒng)的功率分配問題進(jìn)行了研究,即瞬時(shí)干擾信道下、統(tǒng)計(jì)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(dá)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(duì)全文進(jìn)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(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN925

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