摘要
LED替代白炽灯和日光灯用于照明已经成为明显的趋势。LED可以同时用于照明与通信的特点,使得可见光通信(VLC)成为了近年来研究的热点。随着计算机和智能设备的迅速普及,接入网的速率和覆盖面需要进一步提高,VLC技术有望成为突破瓶颈的高速数据传输技术。VLC技术发展的主要挑战在于白光LED有限的调制带宽,研究者们已经提出了多种技术,如均衡技术、蓝光过滤、高阶调制格式、离散多音调调制、波分复用技术和多输入多输出(MIMO)技术等,以扩展调制带宽、提高传输速率。对这些技术的原理和性能进行了分析与讨论,以期为未来的研究提供一些参考。
LED replacing fluorescent and incandescent lamps for hghtlng has become an obvious treno, The feature that LED can be used for both illumination and communications makes visible-light communication （VLC） become a hot point in recent years. With the rapid popularization of computers and smart devices, the bandwidth and coverage of access networks need further improvement. VLC technology is a promising communication technology for high speed data transmission to break through the bottlenecks. A main challenge of this technology is the limited modulation bandwidth of white LED. Researchers have proposed a variety of techniques, such as equalization technology, blue filtering, high-order modulation formats, discrete multi-tone （DMT） modulation, wavelength division multiplexing （WDM） technology, and multiple-input multiple-output （MIMO） technology, to extend bandwidth and increase transmission speed. The principles and performances of those techniques are analyzed and discussed to provide a reference for future researches.
出处
《激光与光电子学进展》
CSCD
北大核心
2013年第5期40-50,共11页
Laser & Optoelectronics Progress
基金
国家973计划(2010CB328300)
国家自然科学基金(61107064
61177071)
国家863计划(2011AA010302
2012AA011302)
国家科技支撑计划(2012BAH18B00)
上海市科委科技创新行动计划(12dz1143000)资助课题
关键词
光通信
可见光通信
白光LED
蓝光过滤
均衡技术
离散多音频调制
多输入多输出技术
波分复用技术
optical communicaitons
visible-light communication
white LED
blue filtering
equalization technology
discrete multi-tone modulation
multiple-input multiple-output
wavelength division multiplexing
