| Summary: | 碩士 === 國立中央大學 === 電機工程學系 === 103 === Visible light communication is a communication technology, have very different characteristics with general communication technology because of the transmission media. Visible light communication has a higher security compared to radio communication. VLC can be combined with general lighting for use in a particular situation or a one-way broadcast transmission. The intensity of VLC is generally the same as lighting. If the beam is too strong can also be observed cause the transmission media is visible. We will continue to explore in the following sections about other advantages of VLC. The focus of this paper examines the visible light communication system in addressing the channel attenuation and resistance to noise interference to enhance the transmission efficiency.
In this paper, design a system for ACO-OFDM (Asymmetrically Clipped Optical OFDM). The specifications from the IEEE 802.11a in restructuring , and using this design specification for the system among VLC. The receiver comprises time and frequency domain conversion, synchronization, and so on. The conversion between time and frequency using Hartley converter instead of general Fourier converter in OFDM, the real arithmetic core of DHT is suitable for VLC. It achieve savings of hardware and enhance the effectiveness. Equalization includes channel estimation and compensation. Synchronization includes sampling clock offset estimation and compensation also have boundary detection.
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