摘要
室内可见光无线通信系统是基于第四代环保节能照明光源白光发光二极管(LED)来设计的,该系统不仅能满足普通室内照明需求,而且能够进行高速光无线通信。随着白光LED照明技术的不断推广,该系统可以为未来高速宽带无线接入提供一种很好的解决方案。由于我国电力线分布广泛,而室内可见光通信系统还能与电力线通信结合起来,因此,室内可见光无线通信系统的研究有着十分重要的发展意义。
本论文在前人研究的基础上,对正交幅度调制(QAM)在室内可见光无线通信中的应用进行了相关研究。该系统主要由三个模块组成:信号发射模块、信号接收模块和QAM调制解调模块。本论文对信号发射模块中的大功率白光LED驱动技术进行了深入研究,并对发射模块中各个子模块均进行了电路仿真,并给出了系统的仿真结果。信号接收模块中,对光电探测系统的频率特性和线性特性进行了电路仿真,并对实际接收系统进行了相关功能测试。QAM调制模块为基于现场可编程门阵列(FPGA)的全数字处理系统,该系统充分利用了FPGA的各种类型的I/O通道、数字信号处理单元、内置的随机存储器(RAM)单元、锁相环等各种功能及资源模块,用来对信号进行实时处理。最后,本论文对基于QAM的室内可见光无线通信系统进行了整体功能测试,并给出了相关测试结果。
Indoor visible light wireless communication system is designed based on the white LED, which is the fourth environment-friendly and energy-saving lighting source. The system can not only meet the needs of ordinary indoor lighting, but also do a high-speed wireless optical communication. AS the white LED lighting technology being promoted, the system can supply a good solution for the future high-speed broadband wireless access. Because electric-power lines are widely distributed in our country, and the system can combine with the electric-power line communication in the future research, so the visible light communication system research has an important developing significance.
On the basis of previous studies, this thesis does some relevant research on the application of QAM in the indoor visible light wireless communication. The system mainly consists of three modules: the signal transmission module, the signal receiving module and the QAM modulation and demodulation module. A deep research has been done on the high-power white LED driven technology, and the circuit simulation have been done for each sub-module of the transmission module, then the system simulation results have been given. In the signal receiving module, this paper does a circuit simulation on the frequency characteristics and linear characteristics of the photoelectric detection system, after that, the relevant functional tests had been done to the receiving system. QAM modulation module is a all-digital processing system based on FPGA, which takes full advantage of the various types of FPGA I/O channels, digital signal processing unit, built-in RAM modules, PLL modules and other resources for the real-time signal processing. Finally, the whole functional tests have been done for the indoor visible light communication system based on QAM, and the relevant testing results have been given in this thesis.
引文
[1]魏承功.基于白光LED的室内可见光通信系统研究: [硕士学位论文].长春:长春理工大学, 2008
[2]丁德强,柯熙政.可见光通信及关键技术研究.半导体光电, 2006, 27(2): 114~117
[3]胡国永.基于LED的可见光无线通信关键技术研究: [硕士学位论文].广州:暨南大学, 2007
[4]周洋,刘耀进,赵玉虎. LED可见光无线通信的现状和发展方向.淮阴工学院学报, 2006, 15(3): 35~38
[5]刘宏展,吕晓旭,王发强等.白光LED照明的可见光通信的现状及发展.光通信技术, 2009, 25(7): 53~57
[6]王永波.室内可见光无线通信系统研究: [硕士学位论文].杭州:浙江大学, 2008
[7] Hoa Le Minh, Dominic O’Brien, Grahame Faulkner, et al. High-Speed Visible Light Communications Using Multiple-Resonant Equalization. IEEE PHOTONICS TECHNOLOGY LETTERS, 2008, 20(14): 1243~1245
[8] Klaus-Dieter Langer, Jelena Grubor, Olivier Bouchet, et al. Optical Wireless Communications for Broadband Access in Home Area Networks. ICTON, 2008, 4(1): 148~154
[9] OMEGA project. http: //www. ict-omega. eu
[10] Klaus-Dieter Langer, Jelena Vu?i?, Christoph Kottke, et al. Advances and Prospects in High-Speed Information Broadcast using Phosphorescent White-Light LEDs. ICTON, 5(3): 1~6
[11] http: //www. vlcc. net
[12] Hoa Le Minh, Dominic O’Brien, Grahame Faulkner, et al. 80 Mbit/s Visible light communications using pre-equalized white LED. ECOC 2008, Brussels, Belgium, 2008: 223~224
[13] J. Grubor. Wireless High-Speed Data Transmission with Phosphorescent White-Light LEDs. ECOC 2007, Berlin, Germany, 2007: 1~2
[14] R. D. Dupuis and M. R. Krames. History, development, and applications of high-brightness visible light emitting diodes. IEEE J. Lightwave Technol., 2008, 26(9): 1154~1171
[15] M. J. McCullagh and D. R. Wisely. 155Mbit/s optical wireless link using a bootstrapped silicon APD receiver. Electronics Letters, 1994, 30(5): 430~432
[16] T. Komine, M. Nakagawa. Fundamental analysis for visible light communication system using LED lightings, IEEE Trans. on Consumer Electronics, 2004, 50(1): 100~107
[17] Hoa Le Minh, Dominic O’Brien, Grahame Faulkner, et al. 100-Mb/s NRZ Visible Light Communications Using a Postequalized White LED. PHOTONICS TECHNOLOGY LETTERS, 2009, 21(15): 1063~1065
[18] T. Komine, M. Nakagawa. Integrated System of White LED Visible-Light Communication and Power-Line Communication. IEEE Trans. Consumer Electronics, 2003, 49(1): 71~79
[19]于志刚.白光LED通信接收系统关键技术研究: [硕士学位论文].广州:暨南大学, 2009
[20]胡国永,陈长缨,陈振强.白光LED照明光源用作室内无线通信研究.光通信技术, 2006, 30(7): 46~48
[21]庞志勇,朴大志,邹传云.光通信中几种调制方式的性能比较[J].桂林电子工业学院学报, 2002, 22(5): 1~4
[22] T. Komine, Y Tanaka, S. Haruyama, M. Nakagawa. Basic study on visible Light using Light emitting Diode Illumination[J]. Proc. of ISMOT 2001, Canada, 2001: 45~48
[23] R. Windisch. Large signal modulation of high-efficiency light-emitting diodes for optical communication. IEEE Journal of Quantum Electronics, 2000, 36(12): 1445~1453
[24] Tanaka Y., Komina T., Harnyama S., et al. Indoor visible system utilizing white LED lights[J]. IEICE Trans. On communication, 2003, E86-B(8): 2440~2454
[25] Pang Grantham. Information technology based on visible LED for optical wireless communications[C]. 2004 IEEE Region 10 Conference Proceedings: Analog and Digital Techniques in Electrical Engineering (IEEE TENCON 2004), Chiang Mai, Thailand, 2004, B: B395~B398
[26] www. lumileds. com
[27] P. Amirshahi, M. Kavehrad. Broadband access over medium and low voltage power-lines and use of white light emitting diodes for indoor communications. in Proc. IEEE Consumer Com. and Networking conf, 2006: 897~901
[28] Komine Toshihiko, Haruyama Shinichiro, NakaMasao. A study of shadowing on indoor visible-light wireless communication utilizing plural white LED lightings. Wireless Personal Communications, 2005, 34(2): 211~222
[29] J. A. C. Bingham. Multi-carrier Modulation for Data Transmission: An Idea whose Time Has Come. IEEE Communications Magazine. 1990, 28: 5~14
[30] Toshihiko, Nakagawa Masao. Fundamental analysis for visible-light communication system using LED lights[J]. IEEE Transactions on Consumer Electronics, 2004, 50(1): 100~107
[31] M. Nakagawa. Wireless home link. IEICE Trans. 1999, E82-B(12): 1893~1896
[32]安毓英,曾晓东.光电探测器原理.西安:西安电子科技大学出版社, 2004: 132~135
[33]梁万国,罗森林,周思永等.光电探测器的设计.半导体光电, 1998(1): 3~7
[34] M. Wolf, D. Kref. Short-Range Wireless Infrared Transmission: The Link Budget Compared to RF. IEEE Wireless Communications Magazine, 2003: 8~14
[35] T. Komine, J. H. Lee, S. Haruyamav, et al. Adaptive equalization for indoor visible light wireless communication systems. APCC 2005, 2005: 291~298
[36] http: //www. hamamatsu. com
[37]顾建军,徐殿国,刘汉奎等.有源滤波技术现状及发展.电机与控制学报, 2003(2): 2~5
[38]杨霖.基于FPGA的EDSL系统QAM解调器的研究: [硕士学位论文].青岛:中国海洋大学, 2009
[39]杨明华.基于FPGA的16QAM调制解调系统的研究: [硕士学位论文].大连:大连海事大学, 2010
[40]和宏海.全数字正交幅度调制器的实现.无线电通信技术, 2003, 29(1): 24~26
[41]陈德锋. EDSL系统中自适应MQAM调制器的研究及FPGA实现: [硕士学位论文].青岛:中国海洋大学, 2007
[42]田耘,徐文波,张延伟等.无线通信FPGA设计.北京:电子工业出版社, 2007: 5~8
[43]樊昌信,张甫翊,徐炳祥等.通信原理(第五版).北京:国防工业出版社, 2001: 193~197
[44]赵梓森.光纤通信工程.北京:人民邮电出版社, 1994: 90~96
[45] D. C. O'Brien. Visible light communications: challenges and possibilities, in Proc. IEEE Symp. on Personal, Indoor and Mobile Radio Communications, PIMRC 2008: 1~5