【摘要】：可見光通信(Visible Light Communication，VLC)是利用LED發(fā)出的肉眼察覺不到的高速調(diào)制信號來實(shí)現(xiàn)信息傳輸?shù)耐ㄐ偶夹g(shù)�？梢姽馔ㄐ偶骖櫿彰骱屯ㄐ�，具有網(wǎng)絡(luò)布置方便、無電磁干擾、通信帶寬大等優(yōu)點(diǎn)，有著巨大的發(fā)展?jié)摿�。本論文圍繞室內(nèi)可見光通信存在的技術(shù)難點(diǎn)開展了具體的研究工作，包括點(diǎn)對點(diǎn)通信中LED編碼、通信的調(diào)制、MIMO復(fù)用結(jié)構(gòu)等。 首先，論文介紹了可見光通信系統(tǒng)的組成；搭建了一套白光LED音頻傳輸?shù)膶?shí)驗(yàn)平臺，實(shí)現(xiàn)了室內(nèi)短距離可見光音頻傳輸，實(shí)驗(yàn)中暴露出可見光通信在未有糾錯(cuò)編碼的情況下性能較差的問題。因此，本論文提出了適合可見光傳輸且具備調(diào)光功能的M-PAM和RS（15,11）編碼方式，并對其性能作了進(jìn)一步分析。結(jié)論表明RS（15,11）糾錯(cuò)編碼在SNR4dB時(shí)，誤碼率明顯改善，且當(dāng)SNR≥10dB后，誤比特率將低于10-4；相比于未使用RS編碼的4-PAM信號的誤比特率性能，RS（15,11）編碼具有2dB的性能改善。 其次，研究了可見光DCO-OFDM調(diào)制，并計(jì)算不同M、DCdB對DCO-OFDM誤碼率的影響，，研究發(fā)現(xiàn)4QAM-DCO-OFDM的性能最優(yōu)，當(dāng)DCdB=0、SNR8dB時(shí)誤碼率可降低到10-5；當(dāng)DCdB=1、SNR12dB時(shí)誤碼率為10-5。此外，建立室內(nèi)可見光通信系統(tǒng)模型，獲取多徑反射后脈沖時(shí)延及衰減的幅頻響應(yīng)，仿真DCO-OFDM信號在一次反射路徑下的誤碼率性能。仿真結(jié)果表明，多徑干擾對誤碼率影響甚重，無論M、DCdB為多少，系統(tǒng)的誤碼率都大于10-3。本論文研究成果為改進(jìn)DCO-OFDM調(diào)制提供了理論依據(jù)。最后，介紹了可見光通信MIMO復(fù)用系統(tǒng)原理，研究了MIMO復(fù)用系統(tǒng)的光學(xué)結(jié)構(gòu)如光源發(fā)散角、偏移角及不同波長的光波與收發(fā)光學(xué)天線（透鏡）尺寸的對通信性能的影響，為優(yōu)化陣列尺寸與傳輸距離提供了理論參數(shù)；并提出了一種QR碼圖形LEDs空間MIMO陣列發(fā)送，實(shí)現(xiàn)了通信距離5米，通信速率24Kbps的單工通信，驗(yàn)證了可見光MIMO復(fù)用結(jié)構(gòu)的可行性，為可見光通信提供了實(shí)驗(yàn)參考。
[Abstract]:Visible light communication (Visible Light Communication,VLC) is a kind of communication technology which can realize the information transmission by using the high speed modulation signal that LED can't detect. Visible light communication has many advantages, such as convenient network arrangement, no electromagnetic interference and large communication bandwidth, so it has great development potential. This paper focuses on the technical difficulties of indoor visible light communication, including LED coding, modulation and MIMO multiplexing in point-to-point communication. Firstly, the composition of visible light communication system is introduced. A set of white light LED audio transmission experiment platform is set up to realize indoor short distance visible light audio transmission. In the experiment, the performance of visible light communication is poor without error correcting coding. Therefore, in this paper, the M-PAM and RS (15F11) coding scheme, which is suitable for visible light transmission and has dimming function, is proposed, and its performance is further analyzed. The results show that the error rate of RS (15M11) error-correcting code is significantly improved when SNR4dB is used, and when SNR 鈮

本文編號：2319033