本文選題：自由空間光通信 + 性能分析��； 參考：《吉林大學(xué)》2017年博士論文

【摘要】：自由空間光通信(FSOC,free space optics communication)是指利用紅外至紫外波段的光載波,在無(wú)波導(dǎo)傳輸媒介中傳輸信息的技術(shù)。FSOC系統(tǒng)具有通信速率高、保密性好、非授權(quán)頻譜、安裝靈活、成本低廉等優(yōu)點(diǎn),廣泛應(yīng)用在城域網(wǎng)擴(kuò)展、災(zāi)后應(yīng)急通信、光纖備份、蜂窩回程網(wǎng)絡(luò)、量子通信以及軍事保密通信等領(lǐng)域。隨著物聯(lián)網(wǎng)和大數(shù)據(jù)時(shí)代的來(lái)臨,人們對(duì)高速、大容量通信網(wǎng)絡(luò)的需求不斷提升,陸地FSOC系統(tǒng)在“最后一英里”問(wèn)題中的應(yīng)用逐漸成為研究熱點(diǎn)。然而,光束在傳播路徑上遇到的大氣湍流以及發(fā)射機(jī)接收機(jī)之間的對(duì)準(zhǔn)誤差會(huì)導(dǎo)致光信號(hào)在幅度和相位上發(fā)生閃爍和畸變,進(jìn)而大幅降低FSOC系統(tǒng)的通信性能,而FSOC系統(tǒng)點(diǎn)對(duì)點(diǎn)傳輸?shù)奶匦詣t會(huì)降低系統(tǒng)的使用效率。為了解決FSOC系統(tǒng)的技術(shù)瓶頸,分集技術(shù)可以改善FSOC系統(tǒng)的通信質(zhì)量,減緩大氣湍流衰落和對(duì)準(zhǔn)誤差對(duì)通信性能的影響;復(fù)用技術(shù)可以提高FSOC系統(tǒng)的使用效率,在不增加設(shè)備成本的情況下,為更多的用戶提供服務(wù);混合射頻/自由空間光通信中繼技術(shù)兼顧改善通信性能和擴(kuò)展通信范圍,將FSOC技術(shù)與傳統(tǒng)射頻(RF,radio frequency)通信技術(shù)相融合,發(fā)揮各自優(yōu)勢(shì),提高通信網(wǎng)絡(luò)整體性能。在設(shè)計(jì)和部署基于上述技術(shù)的FSOC系統(tǒng)時(shí),需要綜合考慮系統(tǒng)的成本、復(fù)雜度以及通信性能等因素。因此,非常有必要對(duì)分集、復(fù)用以及中繼FSOC系統(tǒng)的通信性能進(jìn)行定量的分析,以確保FSOC系統(tǒng)在可控預(yù)算內(nèi)提供最優(yōu)的通信服務(wù)。本文首先分析采用并行發(fā)射分集技術(shù)的FSOC系統(tǒng)漸進(jìn)性能。隨后,分析基于探測(cè)器復(fù)用的同步FSOC系統(tǒng)性能。進(jìn)而,研究混合RF/FSOC中繼系統(tǒng)的端到端通信性能。最后,計(jì)算基于非精確信道模型的FSOC系統(tǒng)的通信性能指標(biāo)。本文的主要研究工作集中于以下幾個(gè)方面:首先,闡述本課題研究的意義和背景,介紹基于分集、復(fù)用以及混合RF/FSOC中繼技術(shù)的FSOC系統(tǒng)性能分析的研究現(xiàn)狀,詳細(xì)介紹FSOC系統(tǒng)中的大氣湍流信道模型和對(duì)準(zhǔn)誤差模型。其次,研究了并行發(fā)射分集技術(shù)在FSOC系統(tǒng)中的應(yīng)用,分析了采用發(fā)射分集技術(shù)的FSOC系統(tǒng)的漸進(jìn)性能。針對(duì)傳統(tǒng)發(fā)射選擇分集(TLS,transmit laser selection)技術(shù)會(huì)造成發(fā)射機(jī)頻繁切換的問(wèn)題,引入了切換輪詢發(fā)射(SET,switch-and-examine transmit)技術(shù)以及后選擇切換輪詢發(fā)射技術(shù)(SETps,switch-and-examine transmit with post-selection)。針對(duì)TLS系統(tǒng)發(fā)射功率受到安全標(biāo)準(zhǔn)限制的問(wèn)題,提出了改進(jìn)的雙分支發(fā)射選擇(Dual-TLS,dual-branch transmit laser selection)原理以及分組發(fā)射選擇(Group-TLS,group transmit laser selection)原理。基于大氣湍流和對(duì)準(zhǔn)誤差復(fù)合漸進(jìn)信道模型,推導(dǎo)了基于上述四種發(fā)射分集技術(shù)的FSOC系統(tǒng)的漸進(jìn)平均符號(hào)錯(cuò)誤概率和分集增益表達(dá)式。再次,在兩用戶同步FSOC通信場(chǎng)景下,研究基于探測(cè)器復(fù)用的FSOC系統(tǒng)的性能。兩個(gè)FSOC用戶分別定義為主用戶和次用戶,二者以不同的功率同步發(fā)送數(shù)據(jù)。針對(duì)無(wú)背景輻射噪聲且接收機(jī)已知信道狀態(tài)信息的情況,分別推導(dǎo)主用戶和次用戶在信道狀態(tài)信息下的條件符號(hào)錯(cuò)誤概率,并利用大氣湍流和對(duì)準(zhǔn)誤差信道模型,計(jì)算平均符號(hào)錯(cuò)誤概率。針對(duì)有背景輻射噪聲的情況,推導(dǎo)主用戶和次用戶數(shù)據(jù)的判決準(zhǔn)則,并計(jì)算在信道狀態(tài)信息下的條件符號(hào)錯(cuò)誤概率。隨后,分析基于中繼的混合RF/FSOC系統(tǒng)的端到端性能。系統(tǒng)中的射頻用戶采用空時(shí)編碼技術(shù),中繼節(jié)點(diǎn)分別采用固定增益放大轉(zhuǎn)發(fā)模式和可變?cè)鲆娣糯筠D(zhuǎn)發(fā)模式,RF鏈路服從瑞利衰落,FSOC鏈路受大氣湍流和對(duì)準(zhǔn)誤差的影響。我們推導(dǎo)系統(tǒng)端到端瞬時(shí)信噪比的累積分布函數(shù),并基于此分別計(jì)算系統(tǒng)的中斷概率與平均符號(hào)錯(cuò)誤概率。此外,利用Meijer-G函數(shù)在零點(diǎn)的級(jí)數(shù)展開(kāi)性質(zhì),討論了固定增益中繼混合RF/FSOC系統(tǒng)的漸進(jìn)性能。最后,分析基于非精確湍流信道模型的FSOC系統(tǒng)性能。假設(shè)非精確模型為精確信道增益與高斯隨機(jī)變量的疊加,而精確信道增益服從考慮對(duì)準(zhǔn)誤差的Gamma-Gamma湍流衰落。我們首先計(jì)算非精確信道增益的統(tǒng)計(jì)特征,并以此推導(dǎo)了非精確信道增益FSOC系統(tǒng)的中斷概率、平均符號(hào)錯(cuò)誤概率以及遍歷容量等性能指標(biāo)的表達(dá)式。
[Abstract]:FSOC (free space optics communication) refers to the technology that uses the optical carrier of the infrared to the ultraviolet band to transmit information in the media without waveguide transmission. The.FSOC system has the advantages of high communication rate, good secrecy, unauthorized spectrum, flexible installation and low cost and so on. It is widely used in the expansion of the metropolitan area network and the emergency communication after the disaster. In the fields of optical fiber backup, cellular return network, quantum communication and military secure communications. With the advent of the Internet of things and the era of big data, the demand for high-speed and large capacity communication networks is increasing. The application of land FSOC system in the "last mile" problem is gradually becoming a hot spot. However, the beam is encountered on the path of propagation. The atmospheric turbulence and the alignment error between the transmitter receiver will cause the light signal to scintillation and distortion in the amplitude and phase, and thus greatly reduce the communication performance of the FSOC system, and the point to point transmission of the FSOC system will reduce the use efficiency of the system. In order to solve the technical bottleneck of the FSOC system, the diversity technology can be changed. The communication quality of good FSOC system reduces the influence of atmospheric turbulence fading and alignment error on communication performance; reuse technology can improve the use efficiency of FSOC systems and provide services for more users without increasing the cost of equipment; hybrid radio frequency / free space optical communication relay technology improves communication performance and extended communication model. It combines the FSOC technology with the traditional RF (radio frequency) communication technology to improve the overall performance of the communication network. When designing and deploying the FSOC system based on the above technology, it is necessary to consider the cost, complexity and communication performance of the system. Therefore, it is very necessary to divide, reuse and relay F. The communication performance of the SOC system is quantitatively analyzed in order to ensure that the FSOC system provides the optimal communication service in the controllable budget. This paper first analyzes the progressive performance of the FSOC system using parallel transmit diversity technology. Then, the performance of the synchronous FSOC system based on the detector reuse is analyzed. Then, the end to end of the hybrid RF/FSOC relay system is studied. In the end, the main research work of this paper is focused on the following aspects: first, the significance and background of the research are expounded, and the research status of the performance analysis of FSOC system based on diversity, reuse and hybrid RF/FSOC relay technology is introduced, and FSO is introduced in detail. The atmospheric turbulence channel model and the alignment error model in the C system. Secondly, the application of the parallel transmit diversity technology in the FSOC system is studied. The gradual performance of the FSOC system using the transmit diversity technology is analyzed. The traditional transmit selection diversity (TLS, transmit laser selection) technology will cause the frequent switching of the transmitter, and the introduction of the transmission diversity (transmit laser selection) technology will be introduced. The SET (switch-and-examine transmit) technology and the post selective switched polling Technology (SETps, switch-and-examine transmit with post-selection) are used to solve the problem that the emission power of the TLS system is limited by the security standard. The improved dual branch selection (Dual-TLS, dual-branch transmit) is proposed. On) principle and the principle of Group-TLS (Group transmit laser selection). Based on the atmospheric turbulence and the align error complex progressive channel model, the progressive mean symbol error probability and the diversity increase expression of the FSOC system based on the above four transmit diversity techniques are derived. Again, the synchronization of the FSOC communication scene in the two user is synchronized. The performance of the FSOC system based on the multiplexed detector is studied. Two FSOC users define the primary and secondary users respectively. The two are sending data at different power synchronously. For the case of no background radiation noise and the known channel state information of the receiver, the conditional symbol error of the main user and the sub user in the channel state information is derived respectively. The probability of error is calculated and the error probability of the mean symbol is calculated by using the atmospheric turbulence and the align error channel model. Based on the background radiation noise, the decision criteria of the main and sub user data are derived, and the conditional symbol error probability under the channel state information is calculated. Then, the end to end of the hybrid RF/FSOC system based on the relay is analyzed. The radio frequency users in the system use space-time coding technology. The relay nodes adopt fixed gain amplification and forward mode and variable gain amplification and forward mode respectively. The RF link obeys Rayleigh fading, and the FSOC link is affected by atmospheric turbulence and alignment error. We derive the cumulative distribution function of the signal to noise ratio at the end to end of the system, and based on this point. In addition, the asymptotic performance of the fixed gain relay hybrid RF/FSOC system is discussed by using the Meijer-G function in the series expansion of the zero point. Finally, the performance of the FSOC system based on the inexact turbulent channel model is analyzed. The false inexact model is the exact channel gain and Gauss follow. The superposition of the machine variables, and the exact channel gain obeys the Gamma-Gamma turbulent fading considering the alignment error. We first calculate the statistical characteristics of the inexact channel gain, and deduce the expression of the performance indexes such as the interruption probability, the mean symbol error probability and the ergodic capacity of the inexact channel gain FSOC system.

【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.1

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