本文選題：正交頻分復(fù)用 + 彈性光網(wǎng)絡(luò)��； 參考：《聊城大學(xué)》2017年碩士論文

【摘要】：近年來,隨著寬帶數(shù)據(jù)業(yè)務(wù)的巨大發(fā)展以及大規(guī)模商用,核心網(wǎng)絡(luò)的網(wǎng)絡(luò)流量幾乎以每年2倍的速度增長,并且增長趨勢日益加快。因此網(wǎng)絡(luò)供應(yīng)商應(yīng)該更新他們的設(shè)備來支持高數(shù)據(jù)速率產(chǎn)品的廣泛應(yīng)用。由于快速增長的通信量需求,要實(shí)現(xiàn)未來的光網(wǎng)絡(luò)需要大容量、低價格的光纖傳輸系統(tǒng)。而目前的波分復(fù)用(WDM,Wavelength Division Multiplexing)技術(shù)也將達(dá)到了它的極限400Gb/s,為滿足未來互聯(lián)網(wǎng)的需要,光傳輸和網(wǎng)絡(luò)技術(shù)要向更高效、靈活、可擴(kuò)展的方向發(fā)展。因此為了提高現(xiàn)在大規(guī)模應(yīng)用的WDM網(wǎng)絡(luò)結(jié)構(gòu)的頻譜利用率,專家學(xué)者們在現(xiàn)有的網(wǎng)絡(luò)結(jié)構(gòu)基礎(chǔ)上提出了一些新型的網(wǎng)絡(luò)結(jié)構(gòu),而基于正交頻分復(fù)用(OFDM,Orthogonal Frequency Division Multiplexing)的彈性光網(wǎng)絡(luò)(EON,Elastic Optical Networking),因其具有較大的優(yōu)勢而被認(rèn)為是的下一代網(wǎng)絡(luò)結(jié)構(gòu)中當(dāng)前WDM網(wǎng)絡(luò)結(jié)構(gòu)的最優(yōu)替代品。因此,在OFDM-based EON這種新型網(wǎng)絡(luò)結(jié)構(gòu)中,在先驗(yàn)信息缺乏的條件下,如何進(jìn)行對多載波的隨機(jī)參數(shù)進(jìn)行自適應(yīng)識別關(guān)系到這種新型網(wǎng)絡(luò)結(jié)構(gòu)能否真正大規(guī)模應(yīng)用。在OFDM-based EON中,信號的各種參數(shù)均處于未知狀態(tài),因此在接收端在缺乏先驗(yàn)信息的條件下,能夠?qū)π盘栠M(jìn)行自適應(yīng)參數(shù)顯得十分重要。同時調(diào)制格式在信號參數(shù)自適應(yīng)識別的過程中處于前端,因此調(diào)制格式識別的準(zhǔn)確率與效率關(guān)系到接下去的參數(shù)識別準(zhǔn)確率與效率。因此本文參考借鑒了在其他領(lǐng)域中用于調(diào)制格式識別的方法,進(jìn)行改進(jìn)并首次在OFDM-based EON這種新型網(wǎng)絡(luò)結(jié)構(gòu)中進(jìn)行運(yùn)用。本文主要的研究內(nèi)容如下:(1)在OFDM-based EON這種新型網(wǎng)絡(luò)結(jié)構(gòu)中,在先驗(yàn)信息缺乏的情況下,首次將計算高階循環(huán)累積量的方法引入光OFDM信號的調(diào)制格式自適應(yīng)識別中。在計算過程中,本文得出了常用低高階調(diào)制格式的高階循環(huán)累積量值,并在此基礎(chǔ)上給出了調(diào)制格式識別區(qū)間,并且通過仿真對該調(diào)制格式識別區(qū)間進(jìn)行了性能檢驗(yàn)。(2)在OFDM-based EON這種新型網(wǎng)絡(luò)結(jié)構(gòu)中,在先驗(yàn)信息缺乏的情況下,首次引入了星座圖聚類并以此為基礎(chǔ)提出了一種改進(jìn)的光OFDM信號的調(diào)制格式識別方法。本文利用仿真系統(tǒng)搭建了OFDM-based EON網(wǎng)絡(luò)結(jié)構(gòu)中的系統(tǒng)模型,并通過仿真驗(yàn)證了該算法的性能。
[Abstract]:In recent years, with the huge development of broadband data services and large-scale commercial, the network traffic of core networks is almost twice as fast as every year, and the increasing trend is accelerating day by day. Therefore, network providers should update their devices to support the wide application of high data rate products. Because of the fast increasing demand of communication traffic, large capacity and low price optical fiber transmission system is needed to realize the future optical network. The current wavelength Division Multiplexing (WDM) technology will reach its limit of 400GB / s. In order to meet the needs of the future Internet, optical transmission and network technology should be more efficient, flexible and scalable. Therefore, in order to improve the spectral efficiency of the WDM network structure, experts and scholars put forward some new network structure based on the existing network structure. The elastic optical network based on orthogonal frequency division multiplexing (OFDM) and orthogonal Frequency Division Multiplexing) is considered to be the best substitute for the current WDM network structure in the next generation because of its advantages. Therefore, in the new network structure of OFDM-based EON, under the condition of lack of prior information, how to self-adaptively identify the random parameters of multi-carrier is related to whether this new network structure can be applied on a large scale. In OFDM-based EON, all the parameters of the signal are unknown, so it is very important to be able to adapt the parameters to the signal without prior information at the receiving end. At the same time, the modulation format is in the front end in the process of adaptive recognition of signal parameters, so the accuracy and efficiency of modulation format recognition are related to the next parameter identification accuracy and efficiency. Therefore, this paper uses the method of modulation format recognition in other fields for reference, and improves it and applies it to the new network structure of OFDM-based EON for the first time. The main contents of this paper are as follows: (1) in the new network structure of OFDM-based EON, the method of calculating high order cyclic cumulants is introduced into the adaptive recognition of modulation format of optical OFDM signals for the first time in the absence of prior information. In the course of calculation, the high order cyclic cumulants of common low order modulation schemes are obtained, and on this basis, the recognition interval of modulation formats is given. And the performance test of the modulation format recognition interval is carried out by simulation. In the new network structure of OFDM-based EON, the prior information is lacking. Constellation clustering is introduced for the first time and an improved modulation format recognition method for optical OFDM signals is proposed. In this paper, the system model of OFDM-based EON network structure is built by simulation system, and the performance of the algorithm is verified by simulation.
【學(xué)位授予單位】：聊城大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.1

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本文編號：1826286