【摘要】：煤礦井下安全作業(yè)離不開(kāi)井下通信技術(shù),如何實(shí)現(xiàn)穩(wěn)定的信息傳輸成為重點(diǎn)研究的問(wèn)題,利用可見(jiàn)光進(jìn)行信息傳輸成為一種選擇,一方面高速的可見(jiàn)光通信技術(shù)可以實(shí)現(xiàn)信息的穩(wěn)定傳輸,另一方面利用原有工作面照明系統(tǒng)實(shí)現(xiàn)信息傳輸可以節(jié)省成本,此外井下相對(duì)封閉的環(huán)境可以有效的減少外界自然光的干擾,為可見(jiàn)光通信創(chuàng)造良好的環(huán)境。本文針對(duì)煤礦井下復(fù)雜多變的工作環(huán)境,提出了將可見(jiàn)光通信技術(shù)應(yīng)用于煤礦井下工作面。首先介紹了煤礦工作面可見(jiàn)光通信系統(tǒng)的整體架構(gòu),包括煤礦工作面可見(jiàn)光通信系統(tǒng)的模型,結(jié)構(gòu)以及實(shí)現(xiàn)方案,本文主要研究了井下工作面照明燈基站與移動(dòng)節(jié)點(diǎn)之間的可見(jiàn)光通信,重點(diǎn)介紹了硬件電路實(shí)現(xiàn)。針對(duì)可見(jiàn)光通信通用硬件電路部分,主要包括發(fā)射端的LED驅(qū)動(dòng)電路,接收端的光電二極管放大電路以及為提高系統(tǒng)帶寬的頻域均衡電路,在LED驅(qū)動(dòng)電路中為提高LED的輸出光功率,利用偏置樹(shù)硬件電路將直流信號(hào)和傳輸?shù)臄?shù)字交流信號(hào)耦合后作用于LED,并設(shè)計(jì)了一種可以調(diào)節(jié)輸出電壓的開(kāi)關(guān)型穩(wěn)壓電路。針對(duì)光電二極管放大電路部分,仿真分析了反饋電阻和反饋電容對(duì)電路帶寬的影響,最后為了滿足要求的放大增益和帶寬,設(shè)計(jì)了二級(jí)放大電路。在可見(jiàn)光通用硬件電路的基礎(chǔ)上設(shè)計(jì)語(yǔ)音信號(hào)的可見(jiàn)光傳輸系統(tǒng),該部分涉及了語(yǔ)音信號(hào)的編碼和解碼。最后介紹了一種可見(jiàn)光通信多用戶實(shí)現(xiàn)方案,該方案是在一路可見(jiàn)光語(yǔ)音系統(tǒng)的基礎(chǔ)上利用時(shí)分復(fù)用原理實(shí)現(xiàn)多用戶,此外提出了一種提高發(fā)射端輸出光功率的解決方案。
[Abstract]:Underground safety operation can not be separated from underground communication technology, how to achieve stable information transmission has become a key research problem, using visible light for information transmission has become a choice. On the one hand, the high-speed visible light communication technology can realize the stable transmission of information, on the other hand, using the original working face lighting system to realize the information transmission can save the cost. In addition, the underground relatively closed environment can effectively reduce the interference of external natural light, and create a good environment for visible light communication. Aiming at the complicated and changeable working environment of underground coal mine, this paper puts forward the application of visible light communication technology in underground working face of coal mine. Firstly, the paper introduces the whole structure of the visible optical communication system in the coal face, including the model, structure and realization scheme of the visible optical communication system in the coal face. In this paper, the visible light communication between the base station and the mobile node in underground working face is studied, and the realization of hardware circuit is emphasized. Aiming at the general hardware circuit of visible light communication, it mainly includes the LED driving circuit at the transmitting end, the photodiode amplifying circuit at the receiving end, and the frequency domain equalization circuit to improve the bandwidth of the system. In order to improve the output power of LED in the LED drive circuit, the DC signal and the transmitted digital AC signal are coupled and acted on the LED, by using the bias tree hardware circuit. A switching voltage regulator circuit which can adjust the output voltage is designed. In the part of photodiode amplification circuit, the influence of feedback resistance and feedback capacitance on circuit bandwidth is simulated and analyzed. Finally, in order to meet the requirements of amplification gain and bandwidth, a two-stage amplifier circuit is designed. The visible light transmission system of speech signal is designed on the basis of visible light general hardware circuit. This part relates to the encoding and decoding of speech signal. Finally, a multi-user realization scheme for visible light communication is introduced, which uses time division multiplexing (TDM) principle on the basis of a visible optical voice system. In addition, a solution to improve the output power of the transmitter is proposed.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN929.1

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本文編號(hào)：2471983