本文選題：可見光通信 + OFDM��； 參考：《哈爾濱理工大學》2017年碩士論文

【摘要】：隨著互聯(lián)網(wǎng)技術(shù)的快速發(fā)展,人們對數(shù)據(jù)的傳輸速率和傳輸質(zhì)量有了更高的要求。但是,在目前的射頻通信領(lǐng)域中,因為數(shù)據(jù)信息傳輸需求迅速增加,讓有限的頻譜資源更加短缺。因此,一種利用LED閃爍信號來進行傳輸數(shù)據(jù)信息的通信方式被提出,其兼具照明和通信雙重功能,我們稱之為可見光通信,它具有無需頻帶資源、對人體沒有傷害以及保密性強等優(yōu)點。同步技術(shù)會直接影響可見光通信系統(tǒng)的整體性能。若是同步估計不夠準確,不僅不能可靠的進行傳輸信息,而且也不能在系統(tǒng)的接收端恢復出所需要的信息,故可見光通信系統(tǒng)要想正常的工作,同步是其基礎(chǔ)。本文主要研究定時同步技術(shù)。本文在分析了可見光通信的特點和現(xiàn)狀后建立了其系統(tǒng)模型。其中,在LED陣列的驅(qū)動模塊,設計的電源系統(tǒng)具有低耗、穩(wěn)定、高效以及使用壽命長等優(yōu)點,其可以認為是一種驅(qū)動LED陣列的理想電源;采用的調(diào)制方式是16QAM-OFDM,其易于抑制多徑效應,不僅可以減少同步算法的設計復雜程度,而且還可以增加頻帶的利用率。在分析了定時同步的經(jīng)典算法SC算法、Minn算法以及Park算法之后,再結(jié)合目前此領(lǐng)域的大量文獻,發(fā)現(xiàn)經(jīng)典算法存在“相關(guān)峰平臺”現(xiàn)象以及次峰干擾影響符號精確定位等,目前研究成果存在實時性不佳以及抗擾性弱等缺陷。本文針對它們的不足之處,提出了一種定時同步的改進算法。最后,將SC算法、Minn算法、Park算法和改進算法應用到可見光通信系統(tǒng)模型中,進行定時估計的仿真測試。采用定時度量函數(shù)和字符串的定時估計均方差曲線對比以及數(shù)據(jù)分析,圖片的視覺差異,檢驗改進算法的可行性。對仿真結(jié)果分析后證明,相比于上述經(jīng)典算法,無論在AWGN還是RMF信道中,本文提出的改進算法能夠精準定位且能保持良好的實時性和抗擾性。尤其在低信噪比的條件下,改進算法的定時估計均方差接近0(為0.041),而基礎(chǔ)算法的均方差遠大于改進算法。本文的研究成果,在可見光通信領(lǐng)域中具有良好的應用前景。
[Abstract]:With the rapid development of Internet technology, people have higher requirements for data transmission rate and transmission quality. However, in the field of radio frequency communication, the demand for data transmission is increasing rapidly, which makes the limited spectrum resources more scarce. Therefore, a communication mode using LED flicker signals to transmit data information is proposed. It has both lighting and communication functions, which we call visible light communication, and it has no frequency band resources. No harm to the human body and strong confidentiality and other advantages. Synchronization technology will directly affect the overall performance of visible light communication systems. If the synchronization estimation is not accurate enough, not only can't transmit the information reliably, but also can't restore the needed information in the receiver of the system, so synchronization is the basis of the visible light communication system if it wants to work normally. This paper mainly studies timing synchronization technology. After analyzing the characteristics and present situation of visible light communication, the system model is established in this paper. In the driving module of LED array, the designed power supply system has the advantages of low consumption, stability, high efficiency and long service life, which can be considered as an ideal power supply for driving LED array. The modulation mode is 16QAM-OFDM, which is easy to suppress the multipath effect, which not only reduces the design complexity of the synchronization algorithm, but also increases the utilization rate of the frequency band. After analyzing the classical algorithm of timing synchronization, SC algorithm and Park algorithm, and combining with a large number of literatures in this field, it is found that the classical algorithm has the phenomenon of "correlation peak platform" and the influence of sub-peak interference on the accurate location of symbol, and so on. At present, the research results have some defects, such as poor real-time performance and weak immunity. In this paper, an improved timing synchronization algorithm is proposed for their shortcomings. Finally, the SC algorithm, Minn algorithm, Park algorithm and the improved algorithm are applied to the visible light communication system model, and the simulation test of timing estimation is carried out. Using timing measure function and string timing estimation mean square error curve contrast and data analysis, image visual difference, to test the feasibility of the improved algorithm. After analyzing the simulation results, it is proved that the proposed improved algorithm can locate accurately and maintain good real-time and immunity in both AWGN and RMF channels, compared with the classical algorithms mentioned above. Especially under the condition of low signal-to-noise ratio, the RMS of the improved algorithm is close to 0 (0.041), while the RMS of the basic algorithm is much larger than that of the improved algorithm. The research results of this paper have a good application prospect in the field of visible light communication.
【學位授予單位】：哈爾濱理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.1

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