本文選題：可見光通信 + 糾錯碼　； 參考：《哈爾濱理工大學(xué)》2017年碩士論文

【摘要】：可見光通信VLC(Visible Light Communication)是使用LED(Light Emitting Diodes)作為數(shù)據(jù)的傳輸裝置進(jìn)行網(wǎng)絡(luò)通信。LED具有體積小、重量輕、壽命長、亮度高等諸多優(yōu)點(diǎn),此外,LED通信具有綠色環(huán)保、無電磁干擾、信息安全、頻譜無需申請等優(yōu)點(diǎn),使得世界各國紛紛關(guān)注并進(jìn)行相關(guān)研究。LED-to-LED可見光通信是一個基于TCP/IP協(xié)議的點(diǎn)對點(diǎn)通信平臺,使用一個發(fā)光二極管實(shí)現(xiàn)數(shù)據(jù)的發(fā)送與接收,LED通過其天然特性將數(shù)據(jù)以光信號的形式發(fā)送出去,LED利用其感光特性將光信號轉(zhuǎn)為電壓信號實(shí)現(xiàn)數(shù)據(jù)的接收。由于微觀上發(fā)送數(shù)據(jù)與接收數(shù)據(jù)不是同時進(jìn)行的,所以LED-to-LED通信平臺的兩端只需一個LED即可同時實(shí)現(xiàn)發(fā)送端與接收端功能。根據(jù)大量實(shí)驗(yàn)發(fā)現(xiàn)在可見光通信中存在隨機(jī)誤碼問題,該問題由環(huán)境中光線干擾、光信號衰減等因素導(dǎo)致,并且隨機(jī)誤碼具有發(fā)生概率高、誤碼位數(shù)低且誤碼位置和時間點(diǎn)不可預(yù)期等特點(diǎn),高發(fā)生率無疑增加了重傳次數(shù),降低了傳輸效率。針對該問題本文提出了一種將低密度奇偶校驗(yàn)碼糾錯碼(Low Density Parity Check Code,LDPC)與RS(Reed Solomon)糾錯碼進(jìn)行級聯(lián)的混合編碼方案,RS碼具有很強(qiáng)的處理突發(fā)錯誤的能力,LDPC碼具有接近香農(nóng)極限的良好性能,該混合編碼能夠有效降低甚至避免隨機(jī)誤碼問題,進(jìn)而提高通信傳輸效率。由于可見光通信中使用的光元器件的物理性質(zhì)限制,在高速數(shù)據(jù)傳輸過程中,常見的光通信LED很難實(shí)現(xiàn)信號的高頻轉(zhuǎn)換,并且接收端接收信號失真較嚴(yán)重,這無疑限制了高負(fù)載率的可見光數(shù)據(jù)傳輸。針對可見光通信負(fù)載率低的問題,根據(jù)現(xiàn)有編碼方法的性能對比分析,本文提出了一種使用OOK(On-Off Keying)和FSK(Frequency Shift Keying)混合編碼的編碼方式,有效的解決了目前傳輸負(fù)載量低的問題。此外,由于FSK相對于OOK有更好的抗干擾能力的特點(diǎn),本文還提出了一種粗粒度載波傳輸?shù)妮o助傳輸方式,FSK編碼數(shù)據(jù)由于其具有較好的傳輸正確率的優(yōu)點(diǎn)作為粗粒度載波數(shù)據(jù),傳輸概要數(shù)據(jù),而OOK由于其具有單位時間傳輸數(shù)據(jù)量高的優(yōu)點(diǎn)作為細(xì)粒度基波數(shù)據(jù),傳輸詳細(xì)數(shù)據(jù)。根據(jù)接收端實(shí)際精度需求來解決重傳問題,如果粗粒度數(shù)據(jù)能夠滿足數(shù)據(jù)需求那么無須進(jìn)行細(xì)粒度數(shù)據(jù)重傳,進(jìn)而降低了重傳次數(shù)。可見光通信具有廣闊的應(yīng)用領(lǐng)域,但目前人們的研究焦點(diǎn)仍然停留在參數(shù)性能上面,對其應(yīng)用領(lǐng)域的考慮缺乏研究。針對可見光通信的功能應(yīng)用問題,本文提出了一種兼具照明功能的可見光通信方案(Brighten Visible Light Communication,Brighten VLC),該方案能夠使得LED始終處于常亮狀態(tài),不受可見光通信設(shè)備所處運(yùn)行狀態(tài)的影響,該方案使得可見光通信能夠很好的實(shí)現(xiàn)通信兼具照明功能,豐富了VLC的應(yīng)用領(lǐng)域。
[Abstract]:Visible light communication (VLC(Visible Light) is a network communication device using LED(Light Emitting Diodes as a data transmission device. It has many advantages, such as small volume, light weight, long life, high brightness and so on. In addition, VLC(Visible Light communication has green environmental protection, no electromagnetic interference, and information security. The spectrum does not need to be applied for, which makes the countries all over the world pay close attention to and research. LED-to-LED visible light communication is a peer-to-peer communication platform based on TCP/IP protocol. Using a light-emitting diode (LED) to transmit and receive the data, the LED transmits the data in the form of light signal through its natural characteristics. The LED converts the light signal into the voltage signal to realize the data receiving by using its photosensitive characteristics. Since sending and receiving data are not carried out at the same time microscopically, the function of sending and receiving can be realized by only one LED at both ends of LED-to-LED communication platform. Based on a large number of experiments, it is found that there is a random error code problem in visible light communication, which is caused by light interference and optical signal attenuation in the environment, and the random error code has a high probability of occurrence. Because of the low number of bit errors and the unpredictable error position and time point, the high incidence rate increases the number of retransmissions and reduces the transmission efficiency. To solve this problem, this paper presents a hybrid scheme for concatenation of low Density Parity Check code and RS(Reed code. RS codes have a strong ability to deal with burst errors. LDPCcodes are close to Shannon. The excellent performance of the limit, The hybrid coding can effectively reduce or even avoid the random error problem and improve the transmission efficiency. Due to the limitation of the physical properties of the optical components used in visible light communication, it is difficult for the LED to realize the high frequency signal conversion in the process of high-speed data transmission, and the distortion of the received signal at the receiving end is serious. This undoubtedly limits the transmission of visible light data at high load rates. Aiming at the problem of low load rate of visible light communication, according to the performance comparison and analysis of the existing coding methods, this paper proposes a hybrid coding method using OOK(On-Off Keying and FSK(Frequency Shift Keying, which effectively solves the problem of low transmission load at present. In addition, because FSK has better anti-jamming ability than OOK, a coarse-grained carrier transmission auxiliary transmission method is proposed in this paper, which is coarse-grained carrier data as coarse-grained carrier data because of its good transmission accuracy. OOK transmits detailed data as fine grained fundamental data because of its advantages of high data volume per unit time. To solve the retransmission problem according to the actual precision requirement of the receiver, if the coarse-grained data can meet the data requirement, then the fine-grained data retransmission is not necessary, thus reducing the retransmission times. Visible light communication has a wide range of applications, but at present, the research focus is still focused on the performance of the parameters. Aiming at the functional application of visible light communication, this paper presents a new visible light communication scheme, Brighten Visible Light Communication and Brighten VLC, which can make LED always be in a normal state without being affected by the operating state of the visible light communication device. This scheme enables visible light communication to achieve both lighting functions and enriches the application field of VLC.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.1

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