本文選題：可見光通信 + 脈沖幅度調(diào)制-離散多音��； 參考：《東南大學(xué)》2017年碩士論文

【摘要】：脈沖幅度調(diào)制-離散多音(Pulse Amplitude Modulation-Discrete MultiTone,PAM-DMT)是一種典型的應(yīng)用于LED(LightEmittingDiode,LED)可見光通信(Visible Light Communication,VLC)系統(tǒng)的光正交頻分復(fù)用(Optical-Orthogonal Frequency Division Multiplexing,O-OFDM)方案。本文主要研究 了基于PAM-DMT的VLC系統(tǒng)中檢測與同步技術(shù),設(shè)計了一個基于時域分集合并辦法的高性能選擇檢測算法,并且提出了基于PAM-DMT接收信號對稱特性的盲符號定時同步算法以及基于高效黃金分割搜索法的采樣時鐘頻率偏差估計方法。首先,本文對傳統(tǒng)射頻(Radio Frequency,RF)通信系統(tǒng)中正交頻分復(fù)用(Orthogonal Frequency Division Multiplexing,OFDM)技術(shù)以及VLC系統(tǒng)中強度調(diào)制/直接檢測(Intensity Modulation/DirectDetection,IM/DD)方式進行 了介紹,引出了適用于IM/DD方式的O-OFDM技術(shù),分析了三種典型的O-OFDM方案,即直流偏置光正交頻分復(fù)用(Direct Current Biased Optical OFDM,DCO-OFDM)、非對稱截斷光正交頻分復(fù)用(Asymmetrically Clipped Optical OFDM,ACO-OFDM)和PAM-DMT。經(jīng)過對這三種方案的理論研究與性能分析,選擇了基于PAM-DMT的VLC系統(tǒng)作為本文研究的系統(tǒng)模型。然后,研究了基于PAM-DMT的高性能選擇性檢測算法的設(shè)計問題�；仡櫫藗鹘y(tǒng)檢測方案并且分別介紹了基于時域和頻域的分集合并檢測辦法。為了解決分集合并的檢測方法中存在的符號矩陣估計精度不高的問題,提出了一種基于時域分集合并辦法的選擇性檢測算法。與頻域分集合并檢測算法相比,該算法的計算復(fù)雜度要小得多。此外,仿真結(jié)果表明,該算法可以進一步改善系統(tǒng)的檢測性能。接著,設(shè)計了基于PAM-DMT的VLC系統(tǒng)中的符號定時同步方案。分別對基于訓(xùn)練序列的定時同步方案和盲定時同步方案進行了探討和總結(jié),給出了基于PAM-DMT接收信號本身固有的結(jié)構(gòu)特性設(shè)計的盲符號定時同步算法。對該定時同步算法進行了仿真,并且與基于訓(xùn)練序列的定時同步算法進行了性能比較。仿真結(jié)果表明,在高信噪比(Signalto Noise Ratio,SNR)下,該定時同步方案可以獲得與基于訓(xùn)練序列的定時同步方案相同的正確定時性能。最后,提出了基于PAM-DMT的VLC系統(tǒng)中的采樣時鐘頻率同步方案。分析了采樣時鐘頻率偏差的基本理論及其對系統(tǒng)性能造成的影響,建立了包含采樣時鐘頻率偏差因子的系統(tǒng)模型。設(shè)計了基于一維搜索方法(黃金分割法)的采樣時鐘頻率偏差因子的估計算法。仿真結(jié)果表明,該算法可以高效地對采樣時鐘頻率偏差因子進行估計,此外,利用得到的高精度的估計值還可以實現(xiàn)對采樣時鐘頻率偏差的有效補償,完成對系統(tǒng)的采樣時鐘頻率的同步。
[Abstract]:Pulse Amplitude Modulation-Discrete Multitone (PAM-DMT) is a typical optical orthogonal Frequency Division Multiplexing (OFDM) scheme for visible Light Communication (VLC) systems. In this paper, the detection and synchronization technology in VLC system based on PAM-DMT is studied, and a high performance selective detection algorithm based on time-domain diversity combination is designed. A blind symbol timing synchronization algorithm based on the symmetry of PAM-DMT received signals and a sampling clock frequency offset estimation method based on efficient golden section search are proposed. Firstly, this paper introduces the orthogonal Frequency Division Multiplexing OFDM (OFDM) technology in the traditional Radio Frequency Division Multiplexing (RF) communication system and the intensity Modulation / Direct Detection (IM-DD) method in VLC system. Three typical O-OFDM schemes, Direct current Biased Optical OFDMOFDM (DCO-OFDM), Asymmetrically clipped Optical OFDM ACO-OFDM and PAM-DMTs, are analyzed. The VLC system based on PAM-DMT is selected as the system model after the theoretical research and performance analysis of the three schemes. Then, the design of high performance selective detection algorithm based on PAM-DMT is studied. This paper reviews the traditional detection schemes and introduces the diversity combination detection methods based on time domain and frequency domain respectively. In order to solve the problem that the precision of symbol matrix estimation is not high in the detection method of diversity merging, a selective detection algorithm based on time-domain diversity combination is proposed. Compared with the frequency domain diversity combination detection algorithm, the computational complexity of this algorithm is much smaller. In addition, the simulation results show that the algorithm can further improve the detection performance of the system. Then, the symbol timing synchronization scheme in VLC system based on PAM-DMT is designed. The timing synchronization scheme based on training sequence and blind timing synchronization scheme are discussed and summarized respectively. A blind symbol timing synchronization algorithm based on the inherent structural characteristics of PAM-DMT reception signal is presented. The timing synchronization algorithm is simulated and compared with the training sequence based timing synchronization algorithm. The simulation results show that the timing synchronization scheme can achieve the same correct timing performance as the training sequence based timing synchronization scheme under high signal-to-noise ratio (SNR). Finally, the sampling clock frequency synchronization scheme in VLC system based on PAM-DMT is proposed. The basic theory of sampling clock frequency deviation and its influence on system performance are analyzed, and a system model including sampling clock frequency deviation factor is established. An estimation algorithm of sampling clock frequency deviation factor based on one dimensional searching method (golden section method) is designed. The simulation results show that the proposed algorithm can efficiently estimate the sampling clock frequency deviation factor, in addition, it can effectively compensate the sampling clock frequency deviation by using the obtained high precision estimation value. Synchronize the sampling clock frequency of the system.
【學(xué)位授予單位】：東南大學(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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