本文選題：天線相關(guān) + 信道估計(jì)誤差�。� 參考：《西安電子科技大學(xué)》2014年博士論文

【摘要】：協(xié)作中繼技術(shù)因其可以顯著提高網(wǎng)絡(luò)的覆蓋范圍、增強(qiáng)無線通信的可靠性而成為無線通信領(lǐng)域最為廣泛關(guān)注的熱點(diǎn)。為進(jìn)一步提高系統(tǒng)容量,對協(xié)作中繼系統(tǒng)采用多天線技術(shù)成為未來移動通信中的關(guān)鍵技術(shù)。如何分析和度量不同多天線中繼傳輸系統(tǒng)的理論性能,是多天線中繼網(wǎng)絡(luò)相關(guān)研究的基礎(chǔ)問題。本文從實(shí)際通信場景下多天線中繼系統(tǒng)模型出發(fā),分別研究了天線的空間相關(guān)性、信道估計(jì)誤差、信息反饋時(shí)延和共信道干擾對單向前向放大(Amplify-and-Forward:AF)中繼網(wǎng)絡(luò)以及雙向AF中繼網(wǎng)絡(luò)的系統(tǒng)性能的影響規(guī)律。本文的主要貢獻(xiàn)概括如下：1.針對天線相關(guān)性,研究了基于天線選擇／機(jī)會調(diào)度策略的雙向前向放大中繼系統(tǒng)(Two-way Amplify-and-Forward Relay Network:TWRN-AF)性能的影響。僅考慮基站配置天線存在空間相關(guān)的情況,K個(gè)單天線用戶通過單天線中繼節(jié)點(diǎn)與基站進(jìn)行雙向通信。在瑞利衰落信道條件下,推導(dǎo)了該系統(tǒng)的中斷概率以及系統(tǒng)總?cè)萘康南陆玳]合表達(dá)式。在此基礎(chǔ)上,為了更直觀地理解用戶數(shù)K以及空間相關(guān)系數(shù)ρ與系統(tǒng)性能之間的關(guān)系,進(jìn)一步分析了在不同信道狀態(tài)特性下,用戶數(shù)K足夠大時(shí),系統(tǒng)總?cè)萘康臐u進(jìn)表達(dá)式。通過理論分析和仿真結(jié)果表明系統(tǒng)性能依賴于空間相關(guān)度以及系統(tǒng)的用戶數(shù)量K。特別地,我們還分析了非對稱信道特性下,中繼節(jié)點(diǎn)的位置對系統(tǒng)性能的影響。2.針對信道估計(jì)誤差和信息反饋時(shí)延,研究了基于波束成形技術(shù)(Beamforming)的單向多輸入多輸出前向放大中繼網(wǎng)絡(luò)(One-way Multiple-input Multiple-output AF Relay Networks:OWRN MIMO AF)的中斷概率以及誤比特率。推導(dǎo)了該系統(tǒng)的中斷概率和誤比特率的閉合表達(dá)式,為了獲得更多直接的結(jié)果,還給出了中斷概率和誤比特率的漸進(jìn)近似公式,分析了系統(tǒng)的分集增益以及編碼增益與信道估計(jì)誤差參數(shù)和反饋時(shí)延相關(guān)系數(shù)之間的關(guān)系。通過理論推導(dǎo)分析信道估計(jì)誤差參數(shù)和反饋時(shí)延相關(guān)系數(shù)對系統(tǒng)的影響機(jī)制,并證明了多天線技術(shù)的采用可以獲得更多的性能增益。但是由于信道估計(jì)誤差和反饋時(shí)延的存在,使得系統(tǒng)性能會受到很大幅度的惡化。即使在源端S和目的端D處配置多根天線,系統(tǒng)的分集增益也不會有所改進(jìn),依然為0。最后,通過理論推導(dǎo)和仿真結(jié)果深入分析了兩種不同信道估計(jì)參數(shù)模型下系統(tǒng)性能的優(yōu)劣。仿真實(shí)驗(yàn)驗(yàn)證了理論分析結(jié)果的正確性。3.針對共信道干擾(Multiple Co-channel Interferers:CCI)和非理想信道狀態(tài)信息(Imperfect Channel State Information:Imperfect CSI)存在的情況,研究了基于傳輸天線選擇/最大比合并(Transmit Antenna Selec-tion/Receiver Maximal-ratio Combining)的單向MIMO AF中繼網(wǎng)絡(luò)的中斷性能�？紤]各個(gè)節(jié)點(diǎn)都配置多根天線并且中繼節(jié)點(diǎn)和目的端存在多個(gè)干擾的通信場景,推導(dǎo)了系統(tǒng)端到端信干比(Signal to Interference Ratio:SIR)表達(dá)式,在此基礎(chǔ)上,給出了系統(tǒng)中斷概率的閉合下界以及漸進(jìn)表達(dá)式,并且深入分析了不完美CSI存在的情況和不完美CSI不存在的情況下,基于多個(gè)共信道干擾的單向MIMO AF系統(tǒng)的分集增益以及編碼增益。理論推導(dǎo)發(fā)現(xiàn),共信道干擾惡化系統(tǒng)的編碼增益但不影響系統(tǒng)的分集增益,在僅有共信道干擾存在的情況下,系統(tǒng)仍然可以獲得滿增益。但是當(dāng)不完美CSI與CCI同時(shí)存在的情況下,系統(tǒng)分集增益將減少,系統(tǒng)性能急速下降。最后,通過仿真結(jié)果驗(yàn)證了理論分析的正確性以及比較分析了信道估計(jì)誤差和反饋系數(shù)對系統(tǒng)性能的影響規(guī)律。
[Abstract]:Cooperative relay technology has become the most widespread concern in the field of wireless communication because it can significantly improve the coverage of the network and enhance the reliability of wireless communication. In order to further improve the system capacity, it is the key technology in the future mobile communication to adopt multi antenna technology to the cooperative relay system. How to analyze and measure different days for different days The theoretical performance of line relay transmission system is the basic problem in the research of multi antenna relay network. In this paper, the spatial correlation, channel estimation error, information feedback delay and common channel interference to one direction forward amplification (Amplify-and-Forward:AF) relay are respectively studied from the multi antenna relay system model under the actual communication scene. The main contributions of the network and the system performance of the bidirectional AF relay network are summarized as follows: 1. for the antenna correlation, the influence of the Two-way Amplify-and-Forward Relay Network: TWRN-AF based on the antenna selection / opportunity scheduling strategy is studied. Only the base station configuration antenna is considered. In the case of spatial correlation, K single antenna users communicate with the base station through a single antenna relay node. Under the Rayleigh fading channel, the interruption probability and the lower bound expression of the system total capacity are derived. On this basis, to more intuitively solve the user number K and the spatial correlation coefficient rho. The relationship between performance is further analyzed for the progressive expression of the total system capacity when the number of users K is large enough under different channel state characteristics. The theoretical analysis and simulation results show that the system performance depends on the spatial correlation and the number of users of the system, K. especially, we also analyze the relay nodes under the asymmetric channel characteristics. The effect of location on the performance of the system.2. studies the interruption probability and bit error rate of the unidirectional multiple input and multi output forward amplification relay network (One-way Multiple-input Multiple-output AF Relay Networks:OWRN MIMO AF) based on the channel estimation error and information feedback delay. In order to obtain more direct results, the asymptotic approximate formula of the interruption probability and bit error rate is given, and the relationship between the diversity gain of the system and the relationship between the coding gain and the channel estimation error parameters and the feedback delay correlation coefficient is analyzed. The channel estimation is derived and analyzed by theoretical deduction. Considering the influence mechanism of the error parameters and the feedback delay correlation coefficient on the system, it is proved that the use of multi antenna technology can gain more performance gain. But because of the existence of channel estimation error and feedback delay, the performance of the system will be greatly deteriorated. Even a number of antennas are configured at the source end S and the destination D. The diversity gain will not be improved, and still is 0.. Through the theoretical and simulation results, the system performance of the two different channel estimation parameters is deeply analyzed. The simulation experiments verify the correctness of the theoretical analysis results.3. for the common channel interference (Multiple Co-channel Interferers:CCI) and the non ideal channel shape. In the presence of Imperfect Channel State Information:Imperfect CSI, the interruption performance of a one-way MIMO AF relay network based on the transmission antenna selection / maximum ratio merger (Transmit Antenna Selec-tion/Receiver Maximal-ratio Combining) is studied. A communication scene with multiple interference is present at the end, and the end to end Signal to Interference Ratio:SIR expression is derived. On this basis, the closed lower bound and progressive expression of the system interrupt probability are given, and the existence of imperfect CSI and the absence of perfect CSI are deeply analyzed, based on multiple Co trust. The diversity gain and coding gain of a one-way MIMO AF system with channel interference are derived. The theoretical derivation shows that cochannel interference worsens the coding gain of the system but does not affect the diversity gain of the system, and the system can still gain full gain in the presence of only common channel interference. But when the imperfect CSI and CCI exist at the same time, the system points are divided. The set gain will be reduced and the system performance decreases rapidly. Finally, the correctness of the theoretical analysis is verified by the simulation results and the influence of channel estimation error and feedback coefficient on the performance of the system is compared and analyzed.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TN92

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