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)成为了近年来国内外研究的热点。由于其具有无辐射、抗电磁干扰、频谱使用无需授权等优势,VLC已成为下一代高速无线接入的新兴技术。目前VLC发展的主要挑战在于LED有限的调制带宽限制了VLC系统的传输速率。针对这一瓶颈,从VLC系统多维复用方式出发,详细介绍了波分复用、频分复用、偏振复用和空分复用四种复用技术,实现多路复用信号并行传输,从而有效提升系统的传输容量。通过对这四种技术原理和性能的分析与讨论,验证了多维复用技术在提升VLC系统传输容量上的可行性,表明了其在VLC系统中广泛的应用前景。
It's an obvious trend that LED will take the place of incandescent lamp and fluorescent for illumination.The combination of illumination and communication makes LED-based visible light communication(VLC)a hot research point all over the world.Because of its advantages of non-radiation,anti-electromagnetic interference and unlicensed frequency spectrum,VLC has become an emerging next-generation high-speed wireless access technology.The main challenge of VLC's development lies in the limited modulation bandwidth of LED,which severely limit the transmission speed of VLC system.To overcome the limitation,based on the dimensional multiplexing schemes,we introduce four multiplexing methods to achieve parallel transmission of multiplexed signals and to improve the transmission capacity of the system,such as wavelength division multiplexing(WDM),frequency division multiplexing(FDM),polarization division multiplexing(PDM)and space division multiplexing(SDM).Through analysis and discussion of these four technologies in principles and performance,we validate the feasibility of dimensional multiplexing schemes in enhancing the transmission capacity of VLC system.The research indicates dimensional multiplexing schemes have broad application prospects in VLC system.
出处
《光学与光电技术》
2014年第4期1-6,共6页
Optics & Optoelectronic Technology
关键词
可见光通信
波分复用
频分复用
偏振复用
空分复用
visible light communication
wavelength division multiplexing
frequency division multiplexing
polarization di-vision multiplexing
space division multiplexing
