本文關(guān)鍵詞： 協(xié)作通信 雙向AF中繼 全雙工 中斷概率 性能分析　出處：《西安電子科技大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：中繼協(xié)作通信系統(tǒng)本質(zhì)上是一種虛擬的多輸入多輸出(Multiple-Input-Multiple-Output,MIMO)系統(tǒng),它通過(guò)將地理上分散的結(jié)點(diǎn)彼此共享天線資源,從而解決了由于尺寸、成本等原因在移動(dòng)結(jié)點(diǎn)上布置多天線困難的問(wèn)題,并且可以以較低的發(fā)送功率有效地?cái)U(kuò)大通信的覆蓋范圍、提高系統(tǒng)容量、對(duì)抗衰落,目前已經(jīng)成為學(xué)術(shù)界的研究熱點(diǎn)并得到了工業(yè)界的廣泛關(guān)注,并被納入3GPP LTE-A和IEEE802.16等多個(gè)國(guó)際標(biāo)準(zhǔn)。本文主要研究基于放大轉(zhuǎn)發(fā)的雙向中繼傳輸系統(tǒng)和全雙工單向中繼系統(tǒng)的性能,與傳統(tǒng)的單向半雙工中繼系統(tǒng)相比,其共同點(diǎn)是可以在兩個(gè)時(shí)隙內(nèi)完成兩次數(shù)據(jù)傳輸。論文的主要工作和貢獻(xiàn)如下:首先,針對(duì)雙向AF中繼系統(tǒng),考慮實(shí)際系統(tǒng)中存在信道估計(jì)誤差以及非對(duì)稱(chēng)數(shù)據(jù)速率需求兩個(gè)因素,根據(jù)非對(duì)稱(chēng)因子的大小,將其分為三類(lèi),在Nakagami-m信道下分別推導(dǎo)了該系統(tǒng)的精確系統(tǒng)中斷概率和一個(gè)很緊的下界。為了更好地分析系統(tǒng)參數(shù)對(duì)系統(tǒng)中斷概率的影響,在高信噪比下,推導(dǎo)了系統(tǒng)中斷概率的漸進(jìn)表達(dá)式,結(jié)果表明由于信道估計(jì)誤差的存在,系統(tǒng)中斷概率在高信噪比下出現(xiàn)地板效應(yīng)。以漸進(jìn)系統(tǒng)中斷概率為優(yōu)化目標(biāo),給出了布置中繼的最優(yōu)位置方案,并在獨(dú)立同分布的Nakagami-m信道中給出了閉式解析式。所得結(jié)論具有一般性和普遍性,仿真結(jié)果證明了所推導(dǎo)公式的正確性和理論分析的實(shí)用性。其次,考慮中繼處I路和Q路信號(hào)失衡的雙向AF中繼系統(tǒng),對(duì)IQ路失衡經(jīng)過(guò)簡(jiǎn)單的補(bǔ)償后,推導(dǎo)了Nakagami-m信道下單向中斷概率解析表達(dá)式和漸進(jìn)表達(dá)式,并分析了信干噪比產(chǎn)生平層效應(yīng)的原因,推導(dǎo)了系統(tǒng)中斷概率的下界和可達(dá)遍歷和容量及其上界,結(jié)果表明無(wú)IQI補(bǔ)償時(shí),系統(tǒng)的中斷概率和遍歷容量會(huì)出現(xiàn)平層,并且只與硬件的系統(tǒng)參數(shù)有關(guān),而經(jīng)過(guò)簡(jiǎn)單的ZF補(bǔ)償后可以消除平層效應(yīng)。作為一種擴(kuò)展情形,綜合考慮由于實(shí)際硬件不理想而產(chǎn)生的多種損耗,建立了相應(yīng)的雙向AF中繼系統(tǒng)傳輸模型,推導(dǎo)并給出了各自用戶(hù)的中斷概率的精確閉式表達(dá)式和漸進(jìn)中斷概率表達(dá)式,得出了對(duì)實(shí)際系統(tǒng)設(shè)計(jì)有指導(dǎo)意義的結(jié)論。仿真結(jié)果表明了理論分析的準(zhǔn)確性以及功率分配方案的有效性。最后,針對(duì)基于譯碼轉(zhuǎn)發(fā)協(xié)議的全雙工中繼系統(tǒng),考慮收發(fā)天線之間存在的回環(huán)干擾衰落信道,推導(dǎo)了Nakagami-m信道下單中繼全雙工譯碼轉(zhuǎn)發(fā)中繼系統(tǒng)和采用機(jī)會(huì)中繼選擇的多中繼系統(tǒng)的中斷概率解析式。以系統(tǒng)遍歷容量最大為目標(biāo),在兩種不同功率限制條件下,分別給出了最優(yōu)功率分配策略,并與等功率分配的情形進(jìn)行了對(duì)比,分析了回環(huán)干擾對(duì)系統(tǒng)性能的影響。結(jié)果表明在較低的發(fā)送功率和在較高的數(shù)據(jù)速率需求的情形下,FDR系統(tǒng)的中斷性能優(yōu)于HDR系統(tǒng)。最后對(duì)所推導(dǎo)的中斷概率和功率分配方案進(jìn)行了仿真驗(yàn)證。
[Abstract]:Relay cooperative communication system is essentially a virtual multiple-input-multiple-output MIMO (Multiple-Input-Multiple-OutputMimo) system. It solves the problem that it is difficult to arrange multiple antennas on mobile nodes because of size and cost by sharing antenna resources among geographically dispersed nodes. And it can effectively expand the communication coverage, improve the system capacity and combat the decline with low transmission power. It has become a hot spot in academic research and has been widely concerned by industry. This paper mainly studies the performance of the bidirectional relay transmission system based on amplifying and forwarding and the full-duplex one-way relay system. Compared with the traditional unidirectional half-duplex relay system, it can transmit data twice in two time slots. The main work and contributions of this paper are as follows: first, for two-way AF relay system. Considering the two factors of channel estimation error and asymmetric data rate requirement in the actual system, it is divided into three categories according to the size of the asymmetric factor. In order to better analyze the influence of system parameters on the system interrupt probability, the precise system interrupt probability and a very tight lower bound are derived under Nakagami-m channel, in order to better analyze the influence of system parameters on the system interrupt probability, the system has a high signal-to-noise ratio (SNR). The asymptotic expression of the system outage probability is derived. The results show that because of the channel estimation error, the outage probability of the system has a floor effect at high SNR. In this paper, the optimal location scheme of relaying is given, and the closed analytic formula is given in the independent and distributed Nakagami-m channel. The results obtained are general and universal. The simulation results show the correctness of the formula and the practicability of the theoretical analysis. Secondly, the bidirectional AF relay system which takes into account the imbalance between I and Q signals at relay points is simply compensated for the imbalance of IQ path. The analytical expressions and asymptotic expressions of one-way interrupt probability in Nakagami-m channel are derived, and the reason for the level effect of signal-to-noise ratio (SINR) is analyzed. The lower bound and reachable ergodic and capacity of the system interrupt probability and its upper bound are derived. The results show that without IQI compensation, the outage probability and ergodic capacity of the system will appear flat layer, and only related to the system parameters of the hardware. After simple ZF compensation, the flat layer effect can be eliminated. As an extended case, considering the various losses caused by the actual hardware is not ideal, the corresponding transmission model of bidirectional AF relay system is established. The exact closed-form expression and the asymptotic probability expression of the outage probability of the respective users are derived and given. The simulation results show the accuracy of the theoretical analysis and the effectiveness of the power allocation scheme. Finally, the full duplex relay system based on decoding and forwarding protocol is proposed. The backloop interference fading channel between transceiver antennas is considered. In this paper, the interrupt probability analysis formulas of Nakagami-m channel send order relay full duplex decoding relay system and multiple relay system with opportunity relay selection are derived. The maximum traversal capacity of the system is the goal. Under two different power constraints, the optimal power allocation strategy is given, and compared with the case of equal power allocation. The effect of the return loop interference on the performance of the system is analyzed. The results show that under the condition of lower transmission power and higher data rate requirement. The outage performance of FDR system is better than that of HDR system. Finally, the outage probability and power allocation scheme are simulated and verified.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN919.3

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