本文選題：可見光通信 + RS糾錯碼�。� 參考：《北京郵電大學》2014年碩士論文

【摘要】：白光LED作為第四代半導(dǎo)體照明光源,具有壽命長、光照強和能效高的特點,是未來國家大力推廣的照明產(chǎn)品。同時,在無線頻譜資源日益枯竭的大背景下,可見光波段具有400THz的帶寬,而且無需申請頻譜資源牌照,不存在電磁干擾,對人體無害等優(yōu)點。隨著LED制造工藝的提升,目前白光LED有著極高的響應(yīng)靈敏度(微秒級),因此,可以用來傳輸高速數(shù)據(jù)。兼顧照明和室內(nèi)通信的可見光通信成為近幾年快速興起的一種室內(nèi)無線寬帶接入技術(shù),具有重要的研究價值和應(yīng)用前景。 可見光通信(VLC)在國內(nèi)還處于起步階段,目前的研究成果主要集中在信道模型分析、調(diào)制方式等方面。對于糾錯碼技術(shù)和多接收技術(shù)在VLC中應(yīng)用的研究幾乎是一片空白,目前實現(xiàn)VLC系統(tǒng)的科研單位也屈指可數(shù)。將糾錯碼技術(shù)和多接收技術(shù)引入到VLC系統(tǒng)具有重要的意義。 本文提出了一種全雙工可見光通信系統(tǒng)模型,闡述了常用的光通信調(diào)制技術(shù)(OOK、PPM和DPPM)和糾錯碼技術(shù)(Turbo碼、LDPC碼和RS碼)。實現(xiàn)了OOK、PPM調(diào)制,通過對比分析,最終選擇了2-PPM作為系統(tǒng)調(diào)制方式。 本文提出了基于PPM調(diào)制和RS糾錯碼的可見光通信系統(tǒng)方案。設(shè)計實現(xiàn)了基于伽羅華域GF(28)的乘法器和RS(160,128)糾錯碼,并利用Modelsim仿真工具驗證了RS碼的糾錯性能。完成了有無RS碼情況下的通信系統(tǒng)誤碼率測試,得出如下結(jié)論：使用RS糾錯碼的BER性能要明顯優(yōu)于無RS糾錯碼,在保證系統(tǒng)的正常傳輸誤碼率低于10-6時,無RS碼時,傳輸距離可達1.5m；而在有RS碼時,傳輸距離可增加至2.2m,效果非常的明顯。在距離大于2.4m時,RS碼不再起到糾錯的作用。 本文提出了基于以太網(wǎng)的可見光通信系統(tǒng)方案。設(shè)計實現(xiàn)了MII控制器,包括MDIO接口控制、MAC與PHY之間數(shù)據(jù)傳輸模塊、4B/5B編碼和異步FIFO緩存器,并利用Modelsim仿真工具驗證了MII接口的正確性。完成了720P高清視頻的傳輸測試,傳輸速率10Mb/s,通信距離3.2m。 本文探討了多接收技術(shù)引入VLC的價值,并對每接收機平均增益與接收機數(shù)量的關(guān)系、不同接收機下系統(tǒng)誤碼率分別進行了仿真�？紤]到接收機的成本問題和誤碼率,提出了采用4接收作為最佳接收方案。
[Abstract]:White LED, as the fourth generation semiconductor lighting source, has the characteristics of long life, strong illumination and high energy efficiency. At the same time, under the background of the depletion of wireless spectrum resources, visible light band has the advantages of 400 THz bandwidth and no application for spectrum resource license, no electromagnetic interference, no harm to human body and so on. With the improvement of LED manufacturing process, white LED has high sensitivity (microsecond), so it can be used to transmit high speed data. The visible light communication with both lighting and indoor communication has become a kind of indoor wireless broadband access technology in recent years, which has important research value and application prospect. Visible light communication (VLC) is still in its infancy in China, and the current research results mainly focus on channel model analysis, modulation methods and so on. The research on the application of error-correcting code technology and multi-receiver technology in VLC is almost a blank. At present, there are only a few scientific research institutes to realize VLC system. It is of great significance to introduce the error-correcting code technology and multi-receiver technology into VLC system. In this paper, a full duplex visible light communication system model is proposed. The commonly used optical communication modulation techniques (OOKPPM and DPPM) and error correction codes (Turbo codes LDPC codes and RS codes) are described. OOKPPM modulation is realized, and 2-PPM is selected as the modulation mode by comparison and analysis. In this paper, a scheme of visible light communication system based on PPM modulation and RS error correction code is proposed. The multiplier and RS (160128) error-correcting code based on GF (28) are designed and implemented, and the error correction performance of RS code is verified by Modelsim simulation tool. The BER test of communication system with or without RS code is completed. The conclusion is as follows: the performance of BER using RS error correction code is obviously better than that of no RS code. When the normal transmission error rate of the system is less than 10-6, the BER performance of the communication system without RS code is obtained. The transmission distance can reach 1.5 m, but the transmission distance can be increased to 2.2 m with RS code, which is very effective. When the distance is more than 2.4 m, the RS code will no longer play an error-correcting role. A scheme of visible light communication system based on Ethernet is presented in this paper. The Mii controller is designed and implemented, including the data transmission module 4B / 5B encoding and asynchronous FIFO buffer between the MDIO interface control and PHY. The correctness of the Mii interface is verified by the Modelsim simulation tool. The transmission test of 720P high-definition video is completed, the transmission rate is 10MB / s and the communication distance is 3.2m. In this paper, the value of introducing VLC into multi-receiver technology is discussed, and the relationship between the average gain per receiver and the number of receivers, and the BER of different receivers are simulated. Considering the cost of receiver and bit error rate (BER), 4 receiver is used as the best receiver.
【學位授予單位】：北京郵電大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.1;TN911.7

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