【摘要】：近年來(lái)無(wú)線通信技術(shù)發(fā)展迅猛,給人們的生活帶來(lái)非常巨大的影響,比如說(shuō)在移動(dòng)通信領(lǐng)域已經(jīng)普及的3G技術(shù)以及正在全面推廣的4G技術(shù),無(wú)線局域網(wǎng)中經(jīng)常用到的WiFi技術(shù)等,都極大的便利了現(xiàn)代人的生活和工作方式。隨著白光LED照明技術(shù)的發(fā)展,如何實(shí)現(xiàn)利用LED光傳輸無(wú)線通信信號(hào)成為了一大研究熱點(diǎn)。本文基于上述思想,設(shè)計(jì)了一個(gè)LED光傳輸網(wǎng)絡(luò)視頻流的實(shí)驗(yàn)方案,并通過(guò)實(shí)際的軟硬件電路將方案付諸實(shí)踐。本論文的創(chuàng)新點(diǎn)在于結(jié)合了LED燈光照明與無(wú)線通信的優(yōu)勢(shì),通過(guò)LED光來(lái)傳輸以太網(wǎng)數(shù)據(jù)流,這樣既可以解決無(wú)線通信中帶寬有限,功耗太大等固有的不足,又具有節(jié)能環(huán)保的巨大優(yōu)勢(shì)。本系統(tǒng)利用高速閃爍的LED光傳輸以太網(wǎng)視頻流,其實(shí)驗(yàn)原理就是將以太網(wǎng)格式的視頻流信息轉(zhuǎn)換成串行信號(hào)去驅(qū)動(dòng)LED燈,高低電平控制著燈的亮滅,然后通過(guò)光電轉(zhuǎn)換模塊將串行信號(hào)恢復(fù),最后由串行信號(hào)轉(zhuǎn)換為GMII格式以太網(wǎng)數(shù)據(jù)供后面的接收端接收和播放。實(shí)驗(yàn)方案如下:視頻發(fā)送由PC機(jī)上的VLC軟件通過(guò)網(wǎng)卡傳送到網(wǎng)線上;然后通過(guò)FPGA電路與以太網(wǎng)PHY芯片為主組成發(fā)送板,PHY芯片負(fù)責(zé)完成網(wǎng)線接口到FPGA接口(GMII格式)數(shù)據(jù)的轉(zhuǎn)換,FPGA完成數(shù)據(jù)緩存,報(bào)文解析,通道切換與并串轉(zhuǎn)換等;帶有以太網(wǎng)數(shù)據(jù)的串行信號(hào)去驅(qū)動(dòng)LED電路,產(chǎn)生高速閃爍的光路,再由光電轉(zhuǎn)換電路完成光信號(hào)到串行數(shù)據(jù)信號(hào)的轉(zhuǎn)換;接收板的主芯片包括了FPGA和PHY芯片,FPGA完成數(shù)據(jù)的恢復(fù)和發(fā)送,PHY則完成GMII格式數(shù)據(jù)到RJ45接口數(shù)據(jù)的轉(zhuǎn)換以方便網(wǎng)線與PC機(jī)之間的數(shù)據(jù)通信;最后,接收PC通過(guò)VLC完成對(duì)視頻的接收和播放。本系統(tǒng)設(shè)計(jì)完成后,對(duì)其進(jìn)行了整體測(cè)試,目前的測(cè)試結(jié)果均滿足甚至超過(guò)客戶提出的需求。包括:光路傳輸帶寬為20M;視頻流可通過(guò)UART、UDP端口號(hào)設(shè)置進(jìn)行靈活切換;視頻流延遲小于0.5秒;視頻流可同步清晰播放,播放過(guò)程中無(wú)丟幀現(xiàn)象或丟幀率為0。目前,本系統(tǒng)目前已經(jīng)順利完成聯(lián)合調(diào)試,下一步可以升級(jí)系統(tǒng)設(shè)計(jì)以滿足市場(chǎng)需求。同時(shí),本課題內(nèi)容為其他LED光通信設(shè)計(jì)者提供了參考。
[Abstract]:In recent years, the rapid development of wireless communication technology has brought a great impact on people's lives, such as 3G technology, which has been popularized in the field of mobile communication, 4G technology, which is being popularized, and WiFi technology, which is often used in WLAN, and so on. Both greatly facilitate the way of life and work of modern people. With the development of white LED lighting technology, how to transmit wireless communication signal using LED optical has become a research hotspot. Based on the above idea, this paper designs an experimental scheme of LED optical transmission network video stream, and puts the scheme into practice through actual hardware and software circuits. The innovation of this paper lies in combining the advantages of LED lighting and wireless communication, transmitting Ethernet data stream through LED light, which can not only solve the inherent shortcomings in wireless communication, such as limited bandwidth, too much power consumption, etc. It also has the huge advantage of energy saving and environmental protection. The experiment principle of this system is to convert the video stream information of Ethernet format into serial signal to drive the LED lamp, and the high and low level control the light to turn out. Then the serial signal is restored by photoelectric conversion module. Finally, the serial signal is converted into Ethernet data in GMII format for receiving and playing at the receiving end. The experimental scheme is as follows: the video transmission is transmitted by the VLC software of the PC machine to the network line through the network card; Then the sending board is composed of FPGA circuit and Ethernet PHY chip. The PHY chip is responsible for the data conversion from the network interface to the FPGA interface (GMII format), the FPGA completes the data cache, message parsing, channel switching and parallel string conversion. The serial signal with Ethernet data drives the LED circuit to produce the high speed flicker optical circuit, and then completes the conversion from the optical signal to the serial data signal by the photoelectric conversion circuit. The main chip of the receiving board includes FPGA and PHY chips, FPGA completes the data recovery and transmission, PHY completes the conversion of GMII format data to RJ45 interface data to facilitate the data communication between network cable and PC computer. Finally, the receiving PC through the VLC to complete the video reception and play. After the design of the system is finished, it is tested as a whole, and the current test results meet or exceed the requirements of the customers. It includes: the transmission bandwidth of the optical path is 20m; the video stream can be flexibly switched through the UART,UDP port number setting; the video stream delay is less than 0.5 seconds; the video stream can be played clearly and synchronously. At present, the system has successfully completed joint debugging, the next step can upgrade the system design to meet market needs. At the same time, this paper provides reference for other LED optical communication designers.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.1

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