本文選題：PDM + CO-OFDM　； 參考：《天津理工大學》2017年碩士論文

【摘要】：偏振復用相干光正交頻分復用(PDM CO-OFDM)技術結合了OFDM技術頻譜效率高、色散(CD)容忍度高、抗偏振模色散(PMD)能力強的優(yōu)點和相干檢測技術接收靈敏度高、傳輸距離長的優(yōu)勢以及偏振復用技術加倍傳輸速率和信道容量的特點。然而,在IQ調制和相干檢測的過程中,由于器件的非理想特性,引入了發(fā)送端和接收端信號同相和正交相(IQ)之間的幅度和相位的不平衡,使得載波間的正交性受到破壞;在數(shù)據(jù)傳輸過程中,由于光纖中的CD、PMD以及噪聲等的影響,引入了兩個偏振態(tài)之間的相互干擾。這兩種因素都會導致PDM CO-OFDM系統(tǒng)性能的嚴重下降。本文主要研究了PDM CO-OFDM系統(tǒng)中信道與IQ不平衡的估計和補償算法。主要內容包括:(1)提出了一種新型訓練序列結構用于估計信道和發(fā)送端IQ不平衡。對比文獻給出了系統(tǒng)的數(shù)學模型,并將信道和IQ不平衡看做一個整體,提出了一種訓練序列結構,并給出了相應的估計和補償算法。由于僅有一半的子載波被使用,使得估計的誤差變大,從而降低了系統(tǒng)的性能。本文依據(jù)模型中IQ不平衡因子間的關系,提出了一種新型的訓練序列結構,并給出了兩種信道和IQ不平衡的估計算法。一種算法實現(xiàn)了信道和IQ不平衡的獨立估計,從而消除了估計誤差的累積;另一種算法降低了訓練序列的開銷,從而提高了頻譜利用率。仿真結果表明:在100Gb/s的系統(tǒng)中經(jīng)過傳輸480km的標準單模光纖的傳輸,當IQ幅度不平衡為3dB,相位不平衡為15°時,對比算法的誤碼率在110-量級;而提出的兩種算法可實現(xiàn)誤碼率為31 10-?的有效傳輸。經(jīng)過對比分析,提出的兩種算法的計算復雜度均降低了將近64%。(2)提出了一種新型訓練序列結構用于估計信道和接收端IQ不平衡。對比文獻采用GSOP算法和傳統(tǒng)訓練序列實現(xiàn)IQ不平衡和信道的估計和補償。GSOP算法并不能完全的消除IQ不平衡,使得信道的估計值會受到殘余的IQ不平衡的影響,從而降低系統(tǒng)的性能。本文推導了系統(tǒng)的數(shù)學模型,并給出了一種新的訓練序列結構,使其與GSOP算法結合時,能夠消除部分殘余IQ不平衡的影響,從而降低信道的估計誤差。另外,本文給出了一種頻域估計算法,能夠實現(xiàn)信道和IQ不平衡的獨立估計,從而消除估計誤差的累積。仿真結果表明:在100Gb/s的系統(tǒng)中經(jīng)過傳輸480km的標準單模光纖的傳輸,當IQ幅度不平衡為2dB,相位不平衡為10°,誤碼率為31 10-?時,所提出的基于新型訓練序列的GSOP算法和頻域估計算法與對比算法相比,對相位的容忍度分別提高了5°和15°,對光信噪比的處罰分別降低了4dB和6dB。
[Abstract]:Polarization-multiplexed coherent optical orthogonal frequency division multiplexing (PM-CO-OFDM) technology combines the advantages of high spectral efficiency of OFDM, high tolerance of dispersive CDD, strong ability of anti-polarization mode dispersion (PMD) and high receiving sensitivity of coherent detection technology.The advantages of long transmission distance and the characteristics of polarization multiplexing technology double transmission rate and channel capacity.However, in the process of IQ modulation and coherent detection, due to the non-ideal characteristics of the device, the amplitude and phase imbalance between the signal of the transmitter and the receiver is introduced, which results in the destruction of the orthogonality between carriers.In the process of data transmission, due to the influence of CDPMD and noise in optical fiber, the interference between two polarization states is introduced.Both of these factors will lead to a serious decline in the performance of PDM CO-OFDM systems.This paper mainly studies the estimation and compensation algorithm of channel and IQ imbalance in PDM CO-OFDM system.The main contents include: 1) A new training sequence structure is proposed to estimate the IQ imbalance between channel and transmitter.In this paper, the mathematical model of the system is given, and the imbalance between channel and IQ is considered as a whole. A training sequence structure is proposed, and the corresponding estimation and compensation algorithms are given.Because only half of the subcarriers are used, the estimation error becomes larger, which reduces the performance of the system.In this paper, according to the relationship between IQ imbalance factors in the model, a new structure of training sequence is proposed, and two estimation algorithms of channel and IQ imbalance are given.One algorithm realizes the independent estimation of the imbalance between channel and IQ, which eliminates the accumulation of estimation error, and the other algorithm reduces the cost of training sequence and improves the spectrum efficiency.The simulation results show that the error rate of the contrast algorithm is 110-magnitude when the IQ amplitude is 3 dB and the phase imbalance is 15 擄through the standard single mode fiber transmission of 480km in the 100Gb/s system, and the error rate of the two algorithms is 31 10 ~ (-)?Effective transmission.Through comparative analysis, the computational complexity of the two algorithms is reduced by nearly 64. 2) A new training sequence structure is proposed to estimate the IQ imbalance between the channel and the receiver.In contrast, using GSOP algorithm and traditional training sequence to realize IQ imbalance and channel estimation and compensation. GSOP algorithm can not completely eliminate IQ imbalance, and the channel estimation value will be affected by residual IQ imbalance.Thus, the performance of the system is reduced.In this paper, the mathematical model of the system is derived, and a new structure of training sequence is given. When combined with GSOP algorithm, the influence of partial residual IQ imbalance can be eliminated and the channel estimation error can be reduced.In addition, this paper presents a frequency domain estimation algorithm, which can realize the independent estimation of channel and IQ imbalance, thus eliminating the accumulation of estimation errors.The simulation results show that when the IQ amplitude is 2 dB, the phase imbalance is 10 擄and the error rate is 31 10?The proposed GSOP algorithm based on the new training sequence and the frequency domain estimation algorithm improve the phase tolerance by 5 擄and 15 擄respectively compared with the contrast algorithm, and the penalty of optical signal-to-noise ratio (SNR) is reduced by 4dB and 6 dB, respectively.
【學位授予單位】：天津理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.1

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