基于OFDM的室內(nèi)光無線傳輸技術(shù)研究
發(fā)布時間：2019-02-11 16:06
【摘要】：可見光通信(VLC)系統(tǒng)是室內(nèi)高速數(shù)據(jù)傳輸極具吸引力和競爭力的解決方案。為滿足室內(nèi)可見光通信高速數(shù)據(jù)傳輸?shù)男枨?在可見光通信系統(tǒng)中引入正交頻分復(fù)用(Orthogonal Frequency Division Multiplexing,OFDM)技術(shù)。由于VLC系統(tǒng)采用強(qiáng)度調(diào)制／直接檢測(IM/DD)技術(shù),調(diào)制LED燈強(qiáng)度的OFDM符號必須滿足實(shí)數(shù)、正極性的要求,因此本文對可見光OFDM信號單極化方法的原理做了詳細(xì)的研究,主要有加直流偏置光OFDM (DC Biased Optical OFDM, DCO-OFDM)、非對稱性限幅光OFDM (Asymmetrically Clipped Optical OFDM, ACO-OFDM)、單極性光OFDM (Unipolar OFDM,U-OFDM)、改進(jìn)的ACO-OFDM (Modified ACO-OFDM, MACO-OFDM)和翻轉(zhuǎn)OFDM (Flip-OFDM),并從功率效率、頻帶利用率及誤碼性能等方面對幾種可見光OFDM系統(tǒng)做對比分析。 作為未來短距離無線通信有效可選方案的可見光通信,照明控制是其面臨的主要挑戰(zhàn)之一。如何在保證可靠的寬帶通信鏈路的同時滿足高質(zhì)量的照明狀態(tài)是可見光通信的重要課題。本文在分析了采用連續(xù)電流調(diào)節(jié)(CCR)和脈沖寬度調(diào)制(PWM)兩種調(diào)光控制技術(shù)的光OFDM系統(tǒng)工作原理的基礎(chǔ)上,提出了一種新的室內(nèi)可見光高速通信調(diào)光控制系統(tǒng)設(shè)計方案。該方案將照明應(yīng)用中的兩種調(diào)光技術(shù)引入到功率效率高、誤碼性能好的Unipolar OFDM系統(tǒng)中,在提供良好傳輸性能的同時實(shí)現(xiàn)了照明信號的連續(xù)調(diào)節(jié)和線性調(diào)節(jié)功能。仿真結(jié)果表明,本文提出的U-OFDM調(diào)光控制系統(tǒng)可在不犧牲照明質(zhì)量的同時獲得更好的誤碼性能,對于設(shè)計具有調(diào)光控制功能的室內(nèi)VLC高速數(shù)據(jù)通信系統(tǒng),基于U-OFDM的PWM調(diào)光控制是一種最佳的解決方法。此外,針對室內(nèi)低照明、低功耗的應(yīng)用需求,本文提出了一種功率更加有效的ZACO-OFDM (Zero-padding ACO-OFDM)系統(tǒng),仿真分析表明,ZACO-OFDM系統(tǒng)可在不損失誤碼性能的情況下提高系統(tǒng)的功率效率、調(diào)光深度及靈活性。
[Abstract]:Visible light communication (VLC) system is an attractive and competitive solution for indoor high-speed data transmission. In order to meet the demand of high speed data transmission for indoor visible light communication, orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing,OFDM) technology is introduced in the visible light communication system. Because the intensity modulation / direct detection (IM/DD) technique is adopted in VLC system, the OFDM symbol of the intensity modulation of LED lamp must meet the requirements of real number and positive pole, so the principle of single polarization method of visible light OFDM signal is studied in detail in this paper. The main ones are DC bias light (OFDM (DC Biased Optical OFDM, DCO-OFDM), asymmetric limiting light (OFDM (Asymmetrically Clipped Optical OFDM, ACO-OFDM), unipolar light (OFDM (Unipolar OFDM,U-OFDM), and improved ACO-OFDM (Modified ACO-OFDM,). MACO-OFDM) and flip OFDM (Flip-OFDM). Several visible light OFDM systems are compared and analyzed from the aspects of power efficiency, band efficiency and bit error performance. As an effective alternative for short range wireless communication in the future, lighting control is one of the main challenges. How to ensure reliable broadband communication links and meet the high quality of lighting is an important subject of visible light communication. Based on the analysis of the working principle of the optical OFDM system which adopts two dimming control technologies: continuous current regulation (CCR) and pulse width modulation (PWM), a new design scheme of the indoor visible light high speed communication dimming control system is proposed. In this scheme, two dimming techniques in lighting applications are introduced into Unipolar OFDM systems with high power efficiency and good bit error performance, which can provide good transmission performance and realize the continuous and linear adjustment functions of lighting signals at the same time. The simulation results show that the proposed U-OFDM dimming control system can achieve better bit error performance without sacrificing lighting quality. For the design of indoor VLC high-speed data communication system with dimming control function, PWM dimming control based on U-OFDM is the best solution. In addition, a more efficient ZACO-OFDM (Zero-padding ACO-OFDM) system is proposed to meet the requirements of indoor low lighting and low power consumption. The simulation results show that, ZACO-OFDM system can improve power efficiency, dimming depth and flexibility without losing bit error performance.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.1
本文編號：2419887
[Abstract]:Visible light communication (VLC) system is an attractive and competitive solution for indoor high-speed data transmission. In order to meet the demand of high speed data transmission for indoor visible light communication, orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing,OFDM) technology is introduced in the visible light communication system. Because the intensity modulation / direct detection (IM/DD) technique is adopted in VLC system, the OFDM symbol of the intensity modulation of LED lamp must meet the requirements of real number and positive pole, so the principle of single polarization method of visible light OFDM signal is studied in detail in this paper. The main ones are DC bias light (OFDM (DC Biased Optical OFDM, DCO-OFDM), asymmetric limiting light (OFDM (Asymmetrically Clipped Optical OFDM, ACO-OFDM), unipolar light (OFDM (Unipolar OFDM,U-OFDM), and improved ACO-OFDM (Modified ACO-OFDM,). MACO-OFDM) and flip OFDM (Flip-OFDM). Several visible light OFDM systems are compared and analyzed from the aspects of power efficiency, band efficiency and bit error performance. As an effective alternative for short range wireless communication in the future, lighting control is one of the main challenges. How to ensure reliable broadband communication links and meet the high quality of lighting is an important subject of visible light communication. Based on the analysis of the working principle of the optical OFDM system which adopts two dimming control technologies: continuous current regulation (CCR) and pulse width modulation (PWM), a new design scheme of the indoor visible light high speed communication dimming control system is proposed. In this scheme, two dimming techniques in lighting applications are introduced into Unipolar OFDM systems with high power efficiency and good bit error performance, which can provide good transmission performance and realize the continuous and linear adjustment functions of lighting signals at the same time. The simulation results show that the proposed U-OFDM dimming control system can achieve better bit error performance without sacrificing lighting quality. For the design of indoor VLC high-speed data communication system with dimming control function, PWM dimming control based on U-OFDM is the best solution. In addition, a more efficient ZACO-OFDM (Zero-padding ACO-OFDM) system is proposed to meet the requirements of indoor low lighting and low power consumption. The simulation results show that, ZACO-OFDM system can improve power efficiency, dimming depth and flexibility without losing bit error performance.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.1
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 丁德強(qiáng);柯熙政;;可見光通信及其關(guān)鍵技術(shù)研究[J];半導(dǎo)體光電;2006年02期
，本文編號：2419887
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