本文選題：光通信 + 高維調制��； 參考：《吉林大學》2017年碩士論文

【摘要】：隨著全球通信技術的飛躍發(fā)展以及高清視頻、賽事直播、云共享、聯(lián)機游戲、視頻會議等帶寬耗盡型業(yè)務的快速普及,網(wǎng)絡帶寬的需求以每年1.6倍的速度迅猛增長。在以物聯(lián)網(wǎng)、大數(shù)據(jù)為技術引導的智能化生活不斷推廣的趨勢下,信息化社會對于光纖通信網(wǎng)絡的帶寬需求勢必超過有史以來的任何一個階段,如何在不增加干線重建成本的基礎上向大容量升級是當前光纖通信系統(tǒng)面臨的主要問題之一。采用高階調制格式是提高系統(tǒng)容量的有效手段。然而,譜效率和功率效率是一對矛盾體,高階調制格式雖然具有較高的譜效率,但功率效率卻因此而下降。在同樣的發(fā)射功率和目標誤碼率下,較小的功率效率將會導致系統(tǒng)的傳輸距離變短。為了解決這一問題,高維調制格式應運而生。高維調制格式可以同時利用光場中的頻率、模式、時隙、偏振態(tài)等多個自由度對信號進行調制,增加的自由度可以最大化星座點間的最小歐式距離,進而增大信號的功率效率,較好地解決現(xiàn)有二維調制格式中譜效率與功率效率相互制約的問題,使長距離光纖通信系統(tǒng)的實現(xiàn)成為了可能。高維調制格式可以利用現(xiàn)行的通信傳輸網(wǎng)絡,在不改變已有光通信系統(tǒng)結構的基礎上,只需在發(fā)送端轉換信號的調制格式,并利用接收端數(shù)字信號處理技術即可提升系統(tǒng)性能,大大節(jié)約了通信成本。因此,研究高維調制格式具有十分重要的意義。在這一背景下,本文對高維調制四大關鍵技術之一的高維映射技術進行了探索與研究,提出了一種基于誤判比特最小化的高維映射技術。論文主要工作如下:首先,從當前通信業(yè)務發(fā)展的趨勢出發(fā),詳細闡述了研究高維調制格式的重要意義,并依據(jù)國內(nèi)外高維調制格式的發(fā)展脈絡,對所取得的研究成果做出了系統(tǒng)的總結。其次,介紹了高維調制格式的基本概念和主要參數(shù),重點介紹了漸進功率效率和譜效率兩個參數(shù)。從實現(xiàn)原理與實現(xiàn)步驟兩方面對高維調制格式的實現(xiàn)方法做出了分析與歸納,并從原理、性能以及硬件實現(xiàn)方式等角度對三種常見的高維調制格式進行了分析。再次,基于近幾年高維調制格式的研究現(xiàn)狀,對高維調制格式的主要技術及每種技術的解決方案進行了詳細的說明與分析,主要包括高維選點技術、高維映射技術、高維信號的解調技術和高維信號的數(shù)字信號處理技術。然后,針對已有高維映射研究中存在的問題,提出了一種基于誤判比特最小化的高維映射技術。詳細介紹了理論模型的建立過程,并推導了代價函數(shù)的理論上下限,給出了代價函數(shù)曲線圖。并給出了基于誤判比特最小化的高維映射的一般步驟,為該映射技術的應用提供了堅實的理論基礎。最后,以VPI-MATLAB聯(lián)合仿真平臺為依托,搭建了高維調制仿真系統(tǒng)。仿真驗證了誤判比特最小化高維映射技術的性能,并與隨機映射進行了對比。對六種四維調制格式與六種八維調制格式的誤碼率進行了詳細的分析,仿真結果充分證明了誤判比特最小化高維映射方式的優(yōu)良性能。
[Abstract]:With the rapid development of global communication technology and the rapid popularization of high definition video, live broadcast, cloud sharing, online games, video conferencing and other bandwidth depletion services, the demand for network bandwidth is growing at a rate of 1.6 times a year. Under the trend of the continuous popularization of the intelligent life guided by the Internet of things and large data, the information society The bandwidth requirement of the optical fiber communication network is bound to exceed any of the historical stages. It is one of the main problems in the current optical fiber communication system that how to upgrade the capacity of the optical fiber communication system without increasing the cost of the trunk reconstruction. The high order modulation format is an effective means to improve the capacity of the system. However, spectral efficiency and power efficiency are also used. The rate is a pair of contradictory bodies. Although the high order modulation format has high spectral efficiency, the power efficiency is reduced. At the same transmission power and target error rate, the smaller power efficiency will lead to the shorter transmission distance of the system. Using the frequency, mode, time slot and polarization state in the optical field to modulate the signal, the increased degree of freedom can maximize the minimum Euclidean distance between the constellation points, and then increase the power efficiency of the signal, and better solve the problem that the spectral efficiency and power efficiency in the existing two-dimensional modulation format are restricted to each other, so that long distance fiber communication is made. The realization of the signal system is possible. The high dimensional modulation format can make use of the current communication transmission network. On the basis of the structure of the optical communication system, it only needs to convert the modulation format of the signal at the sending end, and uses the receiver digital signal processing technology to improve the performance of the system and greatly save the communication cost. Therefore, the study of the communication cost is greatly saved. The high dimensional modulation format is of great significance. In this context, this paper explores and studies the high dimensional mapping technology of one of the four key technologies of high dimensional modulation, and proposes a high dimensional mapping technology based on the minimization of misjudged bits. The main work of this paper is as follows: first, from the trend of the current communication service development, the main work of this paper is detailed. The significance of the study of high dimensional modulation format is elaborated, and according to the development of high dimensional modulation format at home and abroad, the research results obtained are summarized systematically. Secondly, the basic concepts and main parameters of the high dimensional modulation format are introduced, and the two parameters of the progressive work efficiency and spectral efficiency are introduced, and the principle and the implementation principle are introduced. The realization of the high dimensional modulation format is analyzed and summarized in the two party, and the three common high dimensional modulation formats are analyzed from the principle, the performance and the hardware implementation. Thirdly, based on the research status of the high dimensional modulation format in recent years, the main technology and the solution of each technology in the high dimensional modulation format are solved. The scheme is explained and analyzed in detail, including high dimensional point selection, high dimensional mapping, high dimensional signal demodulation and high dimensional signal processing. Then, a high dimensional mapping technique based on the minimization of misjudged bits is proposed. The theoretical model is established and the theoretical and lower limits of the cost function are derived. The graph of the cost function is given. The general step of the high dimensional mapping based on the minimization of misjudged bits is given, which provides a solid theoretical basis for the application of the mapping technology. Finally, the high dimension modulation is built on the basis of the VPI-MATLAB joint simulation platform. Simulation system is used to verify the performance of misjudged bit minimization high dimensional mapping technology and compare with random mapping. The error rate of six four dimensional modulation formats and six eight dimensional modulation formats is analyzed in detail, and the simulation results fully demonstrate the excellent performance of misjudged bit minimization and high dimensional mapping.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN911.3

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